mirror of
https://github.com/taigrr/wtf
synced 2025-01-18 04:03:14 -08:00
1434 lines
32 KiB
Go
1434 lines
32 KiB
Go
// Copyright 2017 The TCell Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use file except in compliance with the License.
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// You may obtain a copy of the license at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package tcell
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import (
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"bytes"
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"io"
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"os"
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"strconv"
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"sync"
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"time"
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"unicode/utf8"
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"golang.org/x/text/transform"
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"github.com/gdamore/tcell/terminfo"
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"github.com/gdamore/tcell/terminfo/dynamic"
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)
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// NewTerminfoScreen returns a Screen that uses the stock TTY interface
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// and POSIX termios, combined with a terminfo description taken from
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// the $TERM environment variable. It returns an error if the terminal
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// is not supported for any reason.
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//
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// For terminals that do not support dynamic resize events, the $LINES
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// $COLUMNS environment variables can be set to the actual window size,
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// otherwise defaults taken from the terminal database are used.
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func NewTerminfoScreen() (Screen, error) {
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ti, e := terminfo.LookupTerminfo(os.Getenv("TERM"))
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if e != nil {
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ti, _, e = dynamic.LoadTerminfo(os.Getenv("TERM"))
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if e != nil {
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return nil, e
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}
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terminfo.AddTerminfo(ti)
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}
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t := &tScreen{ti: ti}
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t.keyexist = make(map[Key]bool)
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t.keycodes = make(map[string]*tKeyCode)
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if len(ti.Mouse) > 0 {
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t.mouse = []byte(ti.Mouse)
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}
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t.prepareKeys()
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t.buildAcsMap()
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t.sigwinch = make(chan os.Signal, 10)
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t.fallback = make(map[rune]string)
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for k, v := range RuneFallbacks {
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t.fallback[k] = v
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}
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return t, nil
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}
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// tKeyCode represents a combination of a key code and modifiers.
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type tKeyCode struct {
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key Key
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mod ModMask
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}
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// tScreen represents a screen backed by a terminfo implementation.
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type tScreen struct {
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ti *terminfo.Terminfo
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h int
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w int
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fini bool
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cells CellBuffer
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in *os.File
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out *os.File
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buffering bool // true if we are collecting writes to buf instead of sending directly to out
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buf bytes.Buffer
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curstyle Style
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style Style
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evch chan Event
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sigwinch chan os.Signal
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quit chan struct{}
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indoneq chan struct{}
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keyexist map[Key]bool
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keycodes map[string]*tKeyCode
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keychan chan []byte
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keytimer *time.Timer
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keyexpire time.Time
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cx int
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cy int
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mouse []byte
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clear bool
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cursorx int
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cursory int
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tiosp *termiosPrivate
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baud int
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wasbtn bool
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acs map[rune]string
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charset string
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encoder transform.Transformer
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decoder transform.Transformer
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fallback map[rune]string
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colors map[Color]Color
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palette []Color
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truecolor bool
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escaped bool
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buttondn bool
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sync.Mutex
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}
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func (t *tScreen) Init() error {
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t.evch = make(chan Event, 10)
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t.indoneq = make(chan struct{})
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t.keychan = make(chan []byte, 10)
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t.keytimer = time.NewTimer(time.Millisecond * 50)
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t.charset = "UTF-8"
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t.charset = getCharset()
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if enc := GetEncoding(t.charset); enc != nil {
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t.encoder = enc.NewEncoder()
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t.decoder = enc.NewDecoder()
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} else {
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return ErrNoCharset
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}
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ti := t.ti
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// environment overrides
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w := ti.Columns
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h := ti.Lines
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if i, _ := strconv.Atoi(os.Getenv("LINES")); i != 0 {
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h = i
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}
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if i, _ := strconv.Atoi(os.Getenv("COLUMNS")); i != 0 {
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w = i
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}
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if e := t.termioInit(); e != nil {
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return e
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}
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if t.ti.SetFgBgRGB != "" || t.ti.SetFgRGB != "" || t.ti.SetBgRGB != "" {
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t.truecolor = true
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}
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// A user who wants to have his themes honored can
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// set this environment variable.
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if os.Getenv("TCELL_TRUECOLOR") == "disable" {
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t.truecolor = false
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}
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if !t.truecolor {
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t.colors = make(map[Color]Color)
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t.palette = make([]Color, t.Colors())
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for i := 0; i < t.Colors(); i++ {
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t.palette[i] = Color(i)
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// identity map for our builtin colors
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t.colors[Color(i)] = Color(i)
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}
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}
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t.TPuts(ti.EnterCA)
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t.TPuts(ti.HideCursor)
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t.TPuts(ti.EnableAcs)
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t.TPuts(ti.Clear)
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t.quit = make(chan struct{})
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t.Lock()
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t.cx = -1
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t.cy = -1
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t.style = StyleDefault
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t.cells.Resize(w, h)
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t.cursorx = -1
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t.cursory = -1
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t.resize()
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t.Unlock()
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go t.mainLoop()
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go t.inputLoop()
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return nil
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}
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func (t *tScreen) prepareKeyMod(key Key, mod ModMask, val string) {
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if val != "" {
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// Do not overrride codes that already exist
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if _, exist := t.keycodes[val]; !exist {
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t.keyexist[key] = true
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t.keycodes[val] = &tKeyCode{key: key, mod: mod}
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}
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}
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}
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func (t *tScreen) prepareKey(key Key, val string) {
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t.prepareKeyMod(key, ModNone, val)
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}
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func (t *tScreen) prepareKeys() {
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ti := t.ti
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t.prepareKey(KeyBackspace, ti.KeyBackspace)
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t.prepareKey(KeyF1, ti.KeyF1)
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t.prepareKey(KeyF2, ti.KeyF2)
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t.prepareKey(KeyF3, ti.KeyF3)
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t.prepareKey(KeyF4, ti.KeyF4)
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t.prepareKey(KeyF5, ti.KeyF5)
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t.prepareKey(KeyF6, ti.KeyF6)
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t.prepareKey(KeyF7, ti.KeyF7)
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t.prepareKey(KeyF8, ti.KeyF8)
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t.prepareKey(KeyF9, ti.KeyF9)
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t.prepareKey(KeyF10, ti.KeyF10)
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t.prepareKey(KeyF11, ti.KeyF11)
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t.prepareKey(KeyF12, ti.KeyF12)
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t.prepareKey(KeyF13, ti.KeyF13)
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t.prepareKey(KeyF14, ti.KeyF14)
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t.prepareKey(KeyF15, ti.KeyF15)
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t.prepareKey(KeyF16, ti.KeyF16)
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t.prepareKey(KeyF17, ti.KeyF17)
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t.prepareKey(KeyF18, ti.KeyF18)
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t.prepareKey(KeyF19, ti.KeyF19)
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t.prepareKey(KeyF20, ti.KeyF20)
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t.prepareKey(KeyF21, ti.KeyF21)
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t.prepareKey(KeyF22, ti.KeyF22)
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t.prepareKey(KeyF23, ti.KeyF23)
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t.prepareKey(KeyF24, ti.KeyF24)
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t.prepareKey(KeyF25, ti.KeyF25)
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t.prepareKey(KeyF26, ti.KeyF26)
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t.prepareKey(KeyF27, ti.KeyF27)
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t.prepareKey(KeyF28, ti.KeyF28)
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t.prepareKey(KeyF29, ti.KeyF29)
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t.prepareKey(KeyF30, ti.KeyF30)
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t.prepareKey(KeyF31, ti.KeyF31)
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t.prepareKey(KeyF32, ti.KeyF32)
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t.prepareKey(KeyF33, ti.KeyF33)
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t.prepareKey(KeyF34, ti.KeyF34)
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t.prepareKey(KeyF35, ti.KeyF35)
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t.prepareKey(KeyF36, ti.KeyF36)
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t.prepareKey(KeyF37, ti.KeyF37)
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t.prepareKey(KeyF38, ti.KeyF38)
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t.prepareKey(KeyF39, ti.KeyF39)
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t.prepareKey(KeyF40, ti.KeyF40)
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t.prepareKey(KeyF41, ti.KeyF41)
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t.prepareKey(KeyF42, ti.KeyF42)
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t.prepareKey(KeyF43, ti.KeyF43)
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t.prepareKey(KeyF44, ti.KeyF44)
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t.prepareKey(KeyF45, ti.KeyF45)
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t.prepareKey(KeyF46, ti.KeyF46)
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t.prepareKey(KeyF47, ti.KeyF47)
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t.prepareKey(KeyF48, ti.KeyF48)
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t.prepareKey(KeyF49, ti.KeyF49)
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t.prepareKey(KeyF50, ti.KeyF50)
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t.prepareKey(KeyF51, ti.KeyF51)
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t.prepareKey(KeyF52, ti.KeyF52)
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t.prepareKey(KeyF53, ti.KeyF53)
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t.prepareKey(KeyF54, ti.KeyF54)
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t.prepareKey(KeyF55, ti.KeyF55)
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t.prepareKey(KeyF56, ti.KeyF56)
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t.prepareKey(KeyF57, ti.KeyF57)
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t.prepareKey(KeyF58, ti.KeyF58)
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t.prepareKey(KeyF59, ti.KeyF59)
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t.prepareKey(KeyF60, ti.KeyF60)
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t.prepareKey(KeyF61, ti.KeyF61)
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t.prepareKey(KeyF62, ti.KeyF62)
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t.prepareKey(KeyF63, ti.KeyF63)
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t.prepareKey(KeyF64, ti.KeyF64)
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t.prepareKey(KeyInsert, ti.KeyInsert)
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t.prepareKey(KeyDelete, ti.KeyDelete)
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t.prepareKey(KeyHome, ti.KeyHome)
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t.prepareKey(KeyEnd, ti.KeyEnd)
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t.prepareKey(KeyUp, ti.KeyUp)
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t.prepareKey(KeyDown, ti.KeyDown)
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t.prepareKey(KeyLeft, ti.KeyLeft)
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t.prepareKey(KeyRight, ti.KeyRight)
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t.prepareKey(KeyPgUp, ti.KeyPgUp)
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t.prepareKey(KeyPgDn, ti.KeyPgDn)
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t.prepareKey(KeyHelp, ti.KeyHelp)
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t.prepareKey(KeyPrint, ti.KeyPrint)
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t.prepareKey(KeyCancel, ti.KeyCancel)
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t.prepareKey(KeyExit, ti.KeyExit)
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t.prepareKey(KeyBacktab, ti.KeyBacktab)
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t.prepareKeyMod(KeyRight, ModShift, ti.KeyShfRight)
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t.prepareKeyMod(KeyLeft, ModShift, ti.KeyShfLeft)
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t.prepareKeyMod(KeyUp, ModShift, ti.KeyShfUp)
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t.prepareKeyMod(KeyDown, ModShift, ti.KeyShfDown)
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t.prepareKeyMod(KeyHome, ModShift, ti.KeyShfHome)
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t.prepareKeyMod(KeyEnd, ModShift, ti.KeyShfEnd)
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t.prepareKeyMod(KeyRight, ModCtrl, ti.KeyCtrlRight)
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t.prepareKeyMod(KeyLeft, ModCtrl, ti.KeyCtrlLeft)
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t.prepareKeyMod(KeyUp, ModCtrl, ti.KeyCtrlUp)
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t.prepareKeyMod(KeyDown, ModCtrl, ti.KeyCtrlDown)
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t.prepareKeyMod(KeyHome, ModCtrl, ti.KeyCtrlHome)
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t.prepareKeyMod(KeyEnd, ModCtrl, ti.KeyCtrlEnd)
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t.prepareKeyMod(KeyRight, ModAlt, ti.KeyAltRight)
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t.prepareKeyMod(KeyLeft, ModAlt, ti.KeyAltLeft)
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t.prepareKeyMod(KeyUp, ModAlt, ti.KeyAltUp)
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t.prepareKeyMod(KeyDown, ModAlt, ti.KeyAltDown)
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t.prepareKeyMod(KeyHome, ModAlt, ti.KeyAltHome)
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t.prepareKeyMod(KeyEnd, ModAlt, ti.KeyAltEnd)
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t.prepareKeyMod(KeyRight, ModAlt, ti.KeyMetaRight)
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t.prepareKeyMod(KeyLeft, ModAlt, ti.KeyMetaLeft)
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t.prepareKeyMod(KeyUp, ModAlt, ti.KeyMetaUp)
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t.prepareKeyMod(KeyDown, ModAlt, ti.KeyMetaDown)
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t.prepareKeyMod(KeyHome, ModAlt, ti.KeyMetaHome)
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t.prepareKeyMod(KeyEnd, ModAlt, ti.KeyMetaEnd)
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t.prepareKeyMod(KeyRight, ModAlt|ModShift, ti.KeyAltShfRight)
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t.prepareKeyMod(KeyLeft, ModAlt|ModShift, ti.KeyAltShfLeft)
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t.prepareKeyMod(KeyUp, ModAlt|ModShift, ti.KeyAltShfUp)
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t.prepareKeyMod(KeyDown, ModAlt|ModShift, ti.KeyAltShfDown)
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t.prepareKeyMod(KeyHome, ModAlt|ModShift, ti.KeyAltShfHome)
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t.prepareKeyMod(KeyEnd, ModAlt|ModShift, ti.KeyAltShfEnd)
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t.prepareKeyMod(KeyRight, ModAlt|ModShift, ti.KeyMetaShfRight)
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t.prepareKeyMod(KeyLeft, ModAlt|ModShift, ti.KeyMetaShfLeft)
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t.prepareKeyMod(KeyUp, ModAlt|ModShift, ti.KeyMetaShfUp)
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t.prepareKeyMod(KeyDown, ModAlt|ModShift, ti.KeyMetaShfDown)
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t.prepareKeyMod(KeyHome, ModAlt|ModShift, ti.KeyMetaShfHome)
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t.prepareKeyMod(KeyEnd, ModAlt|ModShift, ti.KeyMetaShfEnd)
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t.prepareKeyMod(KeyRight, ModCtrl|ModShift, ti.KeyCtrlShfRight)
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t.prepareKeyMod(KeyLeft, ModCtrl|ModShift, ti.KeyCtrlShfLeft)
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t.prepareKeyMod(KeyUp, ModCtrl|ModShift, ti.KeyCtrlShfUp)
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t.prepareKeyMod(KeyDown, ModCtrl|ModShift, ti.KeyCtrlShfDown)
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t.prepareKeyMod(KeyHome, ModCtrl|ModShift, ti.KeyCtrlShfHome)
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t.prepareKeyMod(KeyEnd, ModCtrl|ModShift, ti.KeyCtrlShfEnd)
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// Sadly, xterm handling of keycodes is somewhat erratic. In
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// particular, different codes are sent depending on application
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// mode is in use or not, and the entries for many of these are
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// simply absent from terminfo on many systems. So we insert
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// a number of escape sequences if they are not already used, in
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// order to have the widest correct usage. Note that prepareKey
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// will not inject codes if the escape sequence is already known.
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// We also only do this for terminals that have the application
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// mode present.
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// Cursor mode
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if ti.EnterKeypad != "" {
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t.prepareKey(KeyUp, "\x1b[A")
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t.prepareKey(KeyDown, "\x1b[B")
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t.prepareKey(KeyRight, "\x1b[C")
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t.prepareKey(KeyLeft, "\x1b[D")
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t.prepareKey(KeyEnd, "\x1b[F")
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t.prepareKey(KeyHome, "\x1b[H")
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t.prepareKey(KeyDelete, "\x1b[3~")
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t.prepareKey(KeyHome, "\x1b[1~")
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t.prepareKey(KeyEnd, "\x1b[4~")
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t.prepareKey(KeyPgUp, "\x1b[5~")
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t.prepareKey(KeyPgDn, "\x1b[6~")
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// Application mode
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t.prepareKey(KeyUp, "\x1bOA")
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t.prepareKey(KeyDown, "\x1bOB")
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t.prepareKey(KeyRight, "\x1bOC")
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t.prepareKey(KeyLeft, "\x1bOD")
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t.prepareKey(KeyHome, "\x1bOH")
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}
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outer:
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// Add key mappings for control keys.
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for i := 0; i < ' '; i++ {
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// Do not insert direct key codes for ambiguous keys.
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// For example, ESC is used for lots of other keys, so
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// when parsing this we don't want to fast path handling
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// of it, but instead wait a bit before parsing it as in
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// isolation.
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for esc := range t.keycodes {
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if []byte(esc)[0] == byte(i) {
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continue outer
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}
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}
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t.keyexist[Key(i)] = true
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mod := ModCtrl
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switch Key(i) {
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case KeyBS, KeyTAB, KeyESC, KeyCR:
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// directly typeable- no control sequence
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mod = ModNone
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}
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t.keycodes[string(rune(i))] = &tKeyCode{key: Key(i), mod: mod}
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}
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}
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func (t *tScreen) Fini() {
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t.Lock()
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defer t.Unlock()
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ti := t.ti
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t.cells.Resize(0, 0)
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t.TPuts(ti.ShowCursor)
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t.TPuts(ti.AttrOff)
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t.TPuts(ti.Clear)
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t.TPuts(ti.ExitCA)
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t.TPuts(ti.ExitKeypad)
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t.TPuts(ti.TParm(ti.MouseMode, 0))
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t.curstyle = Style(-1)
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t.clear = false
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t.fini = true
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select {
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case <-t.quit:
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// do nothing, already closed
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default:
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close(t.quit)
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}
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t.termioFini()
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}
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|
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func (t *tScreen) SetStyle(style Style) {
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t.Lock()
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if !t.fini {
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t.style = style
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}
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t.Unlock()
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}
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func (t *tScreen) Clear() {
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t.Fill(' ', t.style)
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}
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func (t *tScreen) Fill(r rune, style Style) {
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t.Lock()
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if !t.fini {
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t.cells.Fill(r, style)
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}
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t.Unlock()
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}
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|
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func (t *tScreen) SetContent(x, y int, mainc rune, combc []rune, style Style) {
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t.Lock()
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if !t.fini {
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t.cells.SetContent(x, y, mainc, combc, style)
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}
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t.Unlock()
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}
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|
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func (t *tScreen) GetContent(x, y int) (rune, []rune, Style, int) {
|
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t.Lock()
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mainc, combc, style, width := t.cells.GetContent(x, y)
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t.Unlock()
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return mainc, combc, style, width
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}
|
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|
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func (t *tScreen) SetCell(x, y int, style Style, ch ...rune) {
|
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if len(ch) > 0 {
|
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t.SetContent(x, y, ch[0], ch[1:], style)
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} else {
|
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t.SetContent(x, y, ' ', nil, style)
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}
|
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}
|
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|
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func (t *tScreen) encodeRune(r rune, buf []byte) []byte {
|
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|
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nb := make([]byte, 6)
|
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ob := make([]byte, 6)
|
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num := utf8.EncodeRune(ob, r)
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ob = ob[:num]
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dst := 0
|
|
var err error
|
|
if enc := t.encoder; enc != nil {
|
|
enc.Reset()
|
|
dst, _, err = enc.Transform(nb, ob, true)
|
|
}
|
|
if err != nil || dst == 0 || nb[0] == '\x1a' {
|
|
// Combining characters are elided
|
|
if len(buf) == 0 {
|
|
if acs, ok := t.acs[r]; ok {
|
|
buf = append(buf, []byte(acs)...)
|
|
} else if fb, ok := t.fallback[r]; ok {
|
|
buf = append(buf, []byte(fb)...)
|
|
} else {
|
|
buf = append(buf, '?')
|
|
}
|
|
}
|
|
} else {
|
|
buf = append(buf, nb[:dst]...)
|
|
}
|
|
|
|
return buf
|
|
}
|
|
|
|
func (t *tScreen) sendFgBg(fg Color, bg Color) {
|
|
ti := t.ti
|
|
if ti.Colors == 0 {
|
|
return
|
|
}
|
|
if t.truecolor {
|
|
if ti.SetFgBgRGB != "" &&
|
|
fg != ColorDefault && bg != ColorDefault {
|
|
r1, g1, b1 := fg.RGB()
|
|
r2, g2, b2 := bg.RGB()
|
|
t.TPuts(ti.TParm(ti.SetFgBgRGB,
|
|
int(r1), int(g1), int(b1),
|
|
int(r2), int(g2), int(b2)))
|
|
} else {
|
|
if fg != ColorDefault && ti.SetFgRGB != "" {
|
|
r, g, b := fg.RGB()
|
|
t.TPuts(ti.TParm(ti.SetFgRGB,
|
|
int(r), int(g), int(b)))
|
|
}
|
|
if bg != ColorDefault && ti.SetBgRGB != "" {
|
|
r, g, b := bg.RGB()
|
|
t.TPuts(ti.TParm(ti.SetBgRGB,
|
|
int(r), int(g), int(b)))
|
|
}
|
|
}
|
|
return
|
|
}
|
|
|
|
if fg != ColorDefault {
|
|
if v, ok := t.colors[fg]; ok {
|
|
fg = v
|
|
} else {
|
|
v = FindColor(fg, t.palette)
|
|
t.colors[fg] = v
|
|
fg = v
|
|
}
|
|
}
|
|
|
|
if bg != ColorDefault {
|
|
if v, ok := t.colors[bg]; ok {
|
|
bg = v
|
|
} else {
|
|
v = FindColor(bg, t.palette)
|
|
t.colors[bg] = v
|
|
bg = v
|
|
}
|
|
}
|
|
|
|
if ti.SetFgBg != "" && fg != ColorDefault && bg != ColorDefault {
|
|
t.TPuts(ti.TParm(ti.SetFgBg, int(fg), int(bg)))
|
|
} else {
|
|
if fg != ColorDefault && ti.SetFg != "" {
|
|
t.TPuts(ti.TParm(ti.SetFg, int(fg)))
|
|
}
|
|
if bg != ColorDefault && ti.SetBg != "" {
|
|
t.TPuts(ti.TParm(ti.SetBg, int(bg)))
|
|
}
|
|
}
|
|
}
|
|
|
|
func (t *tScreen) drawCell(x, y int) int {
|
|
|
|
ti := t.ti
|
|
|
|
mainc, combc, style, width := t.cells.GetContent(x, y)
|
|
if !t.cells.Dirty(x, y) {
|
|
return width
|
|
}
|
|
|
|
if t.cy != y || t.cx != x {
|
|
t.TPuts(ti.TGoto(x, y))
|
|
t.cx = x
|
|
t.cy = y
|
|
}
|
|
|
|
if style == StyleDefault {
|
|
style = t.style
|
|
}
|
|
if style != t.curstyle {
|
|
fg, bg, attrs := style.Decompose()
|
|
|
|
t.TPuts(ti.AttrOff)
|
|
|
|
t.sendFgBg(fg, bg)
|
|
if attrs&AttrBold != 0 {
|
|
t.TPuts(ti.Bold)
|
|
}
|
|
if attrs&AttrUnderline != 0 {
|
|
t.TPuts(ti.Underline)
|
|
}
|
|
if attrs&AttrReverse != 0 {
|
|
t.TPuts(ti.Reverse)
|
|
}
|
|
if attrs&AttrBlink != 0 {
|
|
t.TPuts(ti.Blink)
|
|
}
|
|
if attrs&AttrDim != 0 {
|
|
t.TPuts(ti.Dim)
|
|
}
|
|
t.curstyle = style
|
|
}
|
|
// now emit runes - taking care to not overrun width with a
|
|
// wide character, and to ensure that we emit exactly one regular
|
|
// character followed up by any residual combing characters
|
|
|
|
if width < 1 {
|
|
width = 1
|
|
}
|
|
|
|
var str string
|
|
|
|
buf := make([]byte, 0, 6)
|
|
|
|
buf = t.encodeRune(mainc, buf)
|
|
for _, r := range combc {
|
|
buf = t.encodeRune(r, buf)
|
|
}
|
|
|
|
str = string(buf)
|
|
if width > 1 && str == "?" {
|
|
// No FullWidth character support
|
|
str = "? "
|
|
t.cx = -1
|
|
}
|
|
|
|
// XXX: check for hazeltine not being able to display ~
|
|
|
|
if x > t.w-width {
|
|
// too wide to fit; emit a single space instead
|
|
width = 1
|
|
str = " "
|
|
}
|
|
t.writeString(str)
|
|
t.cx += width
|
|
t.cells.SetDirty(x, y, false)
|
|
if width > 1 {
|
|
t.cx = -1
|
|
}
|
|
|
|
return width
|
|
}
|
|
|
|
func (t *tScreen) ShowCursor(x, y int) {
|
|
t.Lock()
|
|
t.cursorx = x
|
|
t.cursory = y
|
|
t.Unlock()
|
|
}
|
|
|
|
func (t *tScreen) HideCursor() {
|
|
t.ShowCursor(-1, -1)
|
|
}
|
|
|
|
func (t *tScreen) showCursor() {
|
|
|
|
x, y := t.cursorx, t.cursory
|
|
w, h := t.cells.Size()
|
|
if x < 0 || y < 0 || x >= w || y >= h {
|
|
t.hideCursor()
|
|
return
|
|
}
|
|
t.TPuts(t.ti.TGoto(x, y))
|
|
t.TPuts(t.ti.ShowCursor)
|
|
t.cx = x
|
|
t.cy = y
|
|
}
|
|
|
|
// writeString sends a string to the terminal. The string is sent as-is and
|
|
// this function does not expand inline padding indications (of the form
|
|
// $<[delay]> where [delay] is msec). In order to have these expanded, use
|
|
// TPuts. If the screen is "buffering", the string is collected in a buffer,
|
|
// with the intention that the entire buffer be sent to the terminal in one
|
|
// write operation at some point later.
|
|
func (t *tScreen) writeString(s string) {
|
|
if t.buffering {
|
|
io.WriteString(&t.buf, s)
|
|
} else {
|
|
io.WriteString(t.out, s)
|
|
}
|
|
}
|
|
|
|
func (t *tScreen) TPuts(s string) {
|
|
if t.buffering {
|
|
t.ti.TPuts(&t.buf, s, t.baud)
|
|
} else {
|
|
t.ti.TPuts(t.out, s, t.baud)
|
|
}
|
|
}
|
|
|
|
func (t *tScreen) Show() {
|
|
t.Lock()
|
|
if !t.fini {
|
|
t.resize()
|
|
t.draw()
|
|
}
|
|
t.Unlock()
|
|
}
|
|
|
|
func (t *tScreen) clearScreen() {
|
|
fg, bg, _ := t.style.Decompose()
|
|
t.sendFgBg(fg, bg)
|
|
t.TPuts(t.ti.Clear)
|
|
t.clear = false
|
|
}
|
|
|
|
func (t *tScreen) hideCursor() {
|
|
// does not update cursor position
|
|
if t.ti.HideCursor != "" {
|
|
t.TPuts(t.ti.HideCursor)
|
|
} else {
|
|
// No way to hide cursor, stick it
|
|
// at bottom right of screen
|
|
t.cx, t.cy = t.cells.Size()
|
|
t.TPuts(t.ti.TGoto(t.cx, t.cy))
|
|
}
|
|
}
|
|
|
|
func (t *tScreen) draw() {
|
|
// clobber cursor position, because we're gonna change it all
|
|
t.cx = -1
|
|
t.cy = -1
|
|
|
|
t.buf.Reset()
|
|
t.buffering = true
|
|
defer func() {
|
|
t.buffering = false
|
|
}()
|
|
|
|
// hide the cursor while we move stuff around
|
|
t.hideCursor()
|
|
|
|
if t.clear {
|
|
t.clearScreen()
|
|
}
|
|
|
|
for y := 0; y < t.h; y++ {
|
|
for x := 0; x < t.w; x++ {
|
|
width := t.drawCell(x, y)
|
|
if width > 1 {
|
|
if x+1 < t.w {
|
|
// this is necessary so that if we ever
|
|
// go back to drawing that cell, we
|
|
// actually will *draw* it.
|
|
t.cells.SetDirty(x+1, y, true)
|
|
}
|
|
}
|
|
x += width - 1
|
|
}
|
|
}
|
|
|
|
// restore the cursor
|
|
t.showCursor()
|
|
|
|
t.buf.WriteTo(t.out)
|
|
}
|
|
|
|
func (t *tScreen) EnableMouse() {
|
|
if len(t.mouse) != 0 {
|
|
t.TPuts(t.ti.TParm(t.ti.MouseMode, 1))
|
|
}
|
|
}
|
|
|
|
func (t *tScreen) DisableMouse() {
|
|
if len(t.mouse) != 0 {
|
|
t.TPuts(t.ti.TParm(t.ti.MouseMode, 0))
|
|
}
|
|
}
|
|
|
|
func (t *tScreen) Size() (int, int) {
|
|
t.Lock()
|
|
w, h := t.w, t.h
|
|
t.Unlock()
|
|
return w, h
|
|
}
|
|
|
|
func (t *tScreen) resize() {
|
|
if w, h, e := t.getWinSize(); e == nil {
|
|
if w != t.w || h != t.h {
|
|
t.cx = -1
|
|
t.cy = -1
|
|
|
|
t.cells.Resize(w, h)
|
|
t.cells.Invalidate()
|
|
t.h = h
|
|
t.w = w
|
|
ev := NewEventResize(w, h)
|
|
t.PostEvent(ev)
|
|
}
|
|
}
|
|
}
|
|
|
|
func (t *tScreen) Colors() int {
|
|
// this doesn't change, no need for lock
|
|
if t.truecolor {
|
|
return 1 << 24
|
|
}
|
|
return t.ti.Colors
|
|
}
|
|
|
|
func (t *tScreen) PollEvent() Event {
|
|
select {
|
|
case <-t.quit:
|
|
return nil
|
|
case ev := <-t.evch:
|
|
return ev
|
|
}
|
|
}
|
|
|
|
// vtACSNames is a map of bytes defined by terminfo that are used in
|
|
// the terminals Alternate Character Set to represent other glyphs.
|
|
// For example, the upper left corner of the box drawing set can be
|
|
// displayed by printing "l" while in the alternate character set.
|
|
// Its not quite that simple, since the "l" is the terminfo name,
|
|
// and it may be necessary to use a different character based on
|
|
// the terminal implementation (or the terminal may lack support for
|
|
// this altogether). See buildAcsMap below for detail.
|
|
var vtACSNames = map[byte]rune{
|
|
'+': RuneRArrow,
|
|
',': RuneLArrow,
|
|
'-': RuneUArrow,
|
|
'.': RuneDArrow,
|
|
'0': RuneBlock,
|
|
'`': RuneDiamond,
|
|
'a': RuneCkBoard,
|
|
'b': '␉', // VT100, Not defined by terminfo
|
|
'c': '␌', // VT100, Not defined by terminfo
|
|
'd': '␋', // VT100, Not defined by terminfo
|
|
'e': '␊', // VT100, Not defined by terminfo
|
|
'f': RuneDegree,
|
|
'g': RunePlMinus,
|
|
'h': RuneBoard,
|
|
'i': RuneLantern,
|
|
'j': RuneLRCorner,
|
|
'k': RuneURCorner,
|
|
'l': RuneULCorner,
|
|
'm': RuneLLCorner,
|
|
'n': RunePlus,
|
|
'o': RuneS1,
|
|
'p': RuneS3,
|
|
'q': RuneHLine,
|
|
'r': RuneS7,
|
|
's': RuneS9,
|
|
't': RuneLTee,
|
|
'u': RuneRTee,
|
|
'v': RuneBTee,
|
|
'w': RuneTTee,
|
|
'x': RuneVLine,
|
|
'y': RuneLEqual,
|
|
'z': RuneGEqual,
|
|
'{': RunePi,
|
|
'|': RuneNEqual,
|
|
'}': RuneSterling,
|
|
'~': RuneBullet,
|
|
}
|
|
|
|
// buildAcsMap builds a map of characters that we translate from Unicode to
|
|
// alternate character encodings. To do this, we use the standard VT100 ACS
|
|
// maps. This is only done if the terminal lacks support for Unicode; we
|
|
// always prefer to emit Unicode glyphs when we are able.
|
|
func (t *tScreen) buildAcsMap() {
|
|
acsstr := t.ti.AltChars
|
|
t.acs = make(map[rune]string)
|
|
for len(acsstr) > 2 {
|
|
srcv := acsstr[0]
|
|
dstv := string(acsstr[1])
|
|
if r, ok := vtACSNames[srcv]; ok {
|
|
t.acs[r] = t.ti.EnterAcs + dstv + t.ti.ExitAcs
|
|
}
|
|
acsstr = acsstr[2:]
|
|
}
|
|
}
|
|
|
|
func (t *tScreen) PostEventWait(ev Event) {
|
|
t.evch <- ev
|
|
}
|
|
|
|
func (t *tScreen) PostEvent(ev Event) error {
|
|
select {
|
|
case t.evch <- ev:
|
|
return nil
|
|
default:
|
|
return ErrEventQFull
|
|
}
|
|
}
|
|
|
|
func (t *tScreen) clip(x, y int) (int, int) {
|
|
w, h := t.cells.Size()
|
|
if x < 0 {
|
|
x = 0
|
|
}
|
|
if y < 0 {
|
|
y = 0
|
|
}
|
|
if x > w-1 {
|
|
x = w - 1
|
|
}
|
|
if y > h-1 {
|
|
y = h - 1
|
|
}
|
|
return x, y
|
|
}
|
|
|
|
// buildMouseEvent returns an event based on the supplied coordinates and button
|
|
// state. Note that the screen's mouse button state is updated based on the
|
|
// input to this function (i.e. it mutates the receiver).
|
|
func (t *tScreen) buildMouseEvent(x, y, btn int) *EventMouse {
|
|
|
|
// XTerm mouse events only report at most one button at a time,
|
|
// which may include a wheel button. Wheel motion events are
|
|
// reported as single impulses, while other button events are reported
|
|
// as separate press & release events.
|
|
|
|
button := ButtonNone
|
|
mod := ModNone
|
|
|
|
// Mouse wheel has bit 6 set, no release events. It should be noted
|
|
// that wheel events are sometimes misdelivered as mouse button events
|
|
// during a click-drag, so we debounce these, considering them to be
|
|
// button press events unless we see an intervening release event.
|
|
switch btn & 0x43 {
|
|
case 0:
|
|
button = Button1
|
|
t.wasbtn = true
|
|
case 1:
|
|
button = Button2
|
|
t.wasbtn = true
|
|
case 2:
|
|
button = Button3
|
|
t.wasbtn = true
|
|
case 3:
|
|
button = ButtonNone
|
|
t.wasbtn = false
|
|
case 0x40:
|
|
if !t.wasbtn {
|
|
button = WheelUp
|
|
} else {
|
|
button = Button1
|
|
}
|
|
case 0x41:
|
|
if !t.wasbtn {
|
|
button = WheelDown
|
|
} else {
|
|
button = Button2
|
|
}
|
|
}
|
|
|
|
if btn&0x4 != 0 {
|
|
mod |= ModShift
|
|
}
|
|
if btn&0x8 != 0 {
|
|
mod |= ModAlt
|
|
}
|
|
if btn&0x10 != 0 {
|
|
mod |= ModCtrl
|
|
}
|
|
|
|
// Some terminals will report mouse coordinates outside the
|
|
// screen, especially with click-drag events. Clip the coordinates
|
|
// to the screen in that case.
|
|
x, y = t.clip(x, y)
|
|
|
|
return NewEventMouse(x, y, button, mod)
|
|
}
|
|
|
|
// parseSgrMouse attempts to locate an SGR mouse record at the start of the
|
|
// buffer. It returns true, true if it found one, and the associated bytes
|
|
// be removed from the buffer. It returns true, false if the buffer might
|
|
// contain such an event, but more bytes are necessary (partial match), and
|
|
// false, false if the content is definitely *not* an SGR mouse record.
|
|
func (t *tScreen) parseSgrMouse(buf *bytes.Buffer, evs *[]Event) (bool, bool) {
|
|
|
|
b := buf.Bytes()
|
|
|
|
var x, y, btn, state int
|
|
dig := false
|
|
neg := false
|
|
motion := false
|
|
i := 0
|
|
val := 0
|
|
|
|
for i = range b {
|
|
switch b[i] {
|
|
case '\x1b':
|
|
if state != 0 {
|
|
return false, false
|
|
}
|
|
state = 1
|
|
|
|
case '\x9b':
|
|
if state != 0 {
|
|
return false, false
|
|
}
|
|
state = 2
|
|
|
|
case '[':
|
|
if state != 1 {
|
|
return false, false
|
|
}
|
|
state = 2
|
|
|
|
case '<':
|
|
if state != 2 {
|
|
return false, false
|
|
}
|
|
val = 0
|
|
dig = false
|
|
neg = false
|
|
state = 3
|
|
|
|
case '-':
|
|
if state != 3 && state != 4 && state != 5 {
|
|
return false, false
|
|
}
|
|
if dig || neg {
|
|
return false, false
|
|
}
|
|
neg = true // stay in state
|
|
|
|
case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
|
|
if state != 3 && state != 4 && state != 5 {
|
|
return false, false
|
|
}
|
|
val *= 10
|
|
val += int(b[i] - '0')
|
|
dig = true // stay in state
|
|
|
|
case ';':
|
|
if neg {
|
|
val = -val
|
|
}
|
|
switch state {
|
|
case 3:
|
|
btn, val = val, 0
|
|
neg, dig, state = false, false, 4
|
|
case 4:
|
|
x, val = val-1, 0
|
|
neg, dig, state = false, false, 5
|
|
default:
|
|
return false, false
|
|
}
|
|
|
|
case 'm', 'M':
|
|
if state != 5 {
|
|
return false, false
|
|
}
|
|
if neg {
|
|
val = -val
|
|
}
|
|
y = val - 1
|
|
|
|
motion = (btn & 32) != 0
|
|
btn &^= 32
|
|
if b[i] == 'm' {
|
|
// mouse release, clear all buttons
|
|
btn |= 3
|
|
btn &^= 0x40
|
|
t.buttondn = false
|
|
} else if motion {
|
|
/*
|
|
* Some broken terminals appear to send
|
|
* mouse button one motion events, instead of
|
|
* encoding 35 (no buttons) into these events.
|
|
* We resolve these by looking for a non-motion
|
|
* event first.
|
|
*/
|
|
if !t.buttondn {
|
|
btn |= 3
|
|
btn &^= 0x40
|
|
}
|
|
} else {
|
|
t.buttondn = true
|
|
}
|
|
// consume the event bytes
|
|
for i >= 0 {
|
|
buf.ReadByte()
|
|
i--
|
|
}
|
|
*evs = append(*evs, t.buildMouseEvent(x, y, btn))
|
|
return true, true
|
|
}
|
|
}
|
|
|
|
// incomplete & inconclusve at this point
|
|
return true, false
|
|
}
|
|
|
|
// parseXtermMouse is like parseSgrMouse, but it parses a legacy
|
|
// X11 mouse record.
|
|
func (t *tScreen) parseXtermMouse(buf *bytes.Buffer, evs *[]Event) (bool, bool) {
|
|
|
|
b := buf.Bytes()
|
|
|
|
state := 0
|
|
btn := 0
|
|
x := 0
|
|
y := 0
|
|
|
|
for i := range b {
|
|
switch state {
|
|
case 0:
|
|
switch b[i] {
|
|
case '\x1b':
|
|
state = 1
|
|
case '\x9b':
|
|
state = 2
|
|
default:
|
|
return false, false
|
|
}
|
|
case 1:
|
|
if b[i] != '[' {
|
|
return false, false
|
|
}
|
|
state = 2
|
|
case 2:
|
|
if b[i] != 'M' {
|
|
return false, false
|
|
}
|
|
state++
|
|
case 3:
|
|
btn = int(b[i])
|
|
state++
|
|
case 4:
|
|
x = int(b[i]) - 32 - 1
|
|
state++
|
|
case 5:
|
|
y = int(b[i]) - 32 - 1
|
|
for i >= 0 {
|
|
buf.ReadByte()
|
|
i--
|
|
}
|
|
*evs = append(*evs, t.buildMouseEvent(x, y, btn))
|
|
return true, true
|
|
}
|
|
}
|
|
return true, false
|
|
}
|
|
|
|
func (t *tScreen) parseFunctionKey(buf *bytes.Buffer, evs *[]Event) (bool, bool) {
|
|
b := buf.Bytes()
|
|
partial := false
|
|
for e, k := range t.keycodes {
|
|
esc := []byte(e)
|
|
if (len(esc) == 1) && (esc[0] == '\x1b') {
|
|
continue
|
|
}
|
|
if bytes.HasPrefix(b, esc) {
|
|
// matched
|
|
var r rune
|
|
if len(esc) == 1 {
|
|
r = rune(b[0])
|
|
}
|
|
mod := k.mod
|
|
if t.escaped {
|
|
mod |= ModAlt
|
|
t.escaped = false
|
|
}
|
|
*evs = append(*evs, NewEventKey(k.key, r, mod))
|
|
for i := 0; i < len(esc); i++ {
|
|
buf.ReadByte()
|
|
}
|
|
return true, true
|
|
}
|
|
if bytes.HasPrefix(esc, b) {
|
|
partial = true
|
|
}
|
|
}
|
|
return partial, false
|
|
}
|
|
|
|
func (t *tScreen) parseRune(buf *bytes.Buffer, evs *[]Event) (bool, bool) {
|
|
b := buf.Bytes()
|
|
if b[0] >= ' ' && b[0] <= 0x7F {
|
|
// printable ASCII easy to deal with -- no encodings
|
|
mod := ModNone
|
|
if t.escaped {
|
|
mod = ModAlt
|
|
t.escaped = false
|
|
}
|
|
*evs = append(*evs, NewEventKey(KeyRune, rune(b[0]), mod))
|
|
buf.ReadByte()
|
|
return true, true
|
|
}
|
|
|
|
if b[0] < 0x80 {
|
|
// Low numbered values are control keys, not runes.
|
|
return false, false
|
|
}
|
|
|
|
utfb := make([]byte, 12)
|
|
for l := 1; l <= len(b); l++ {
|
|
t.decoder.Reset()
|
|
nout, nin, e := t.decoder.Transform(utfb, b[:l], true)
|
|
if e == transform.ErrShortSrc {
|
|
continue
|
|
}
|
|
if nout != 0 {
|
|
r, _ := utf8.DecodeRune(utfb[:nout])
|
|
if r != utf8.RuneError {
|
|
mod := ModNone
|
|
if t.escaped {
|
|
mod = ModAlt
|
|
t.escaped = false
|
|
}
|
|
*evs = append(*evs, NewEventKey(KeyRune, r, mod))
|
|
}
|
|
for nin > 0 {
|
|
buf.ReadByte()
|
|
nin--
|
|
}
|
|
return true, true
|
|
}
|
|
}
|
|
// Looks like potential escape
|
|
return true, false
|
|
}
|
|
|
|
func (t *tScreen) scanInput(buf *bytes.Buffer, expire bool) {
|
|
evs := t.collectEventsFromInput(buf, expire)
|
|
|
|
for _, ev := range evs {
|
|
t.PostEventWait(ev)
|
|
}
|
|
}
|
|
|
|
// Return an array of Events extracted from the supplied buffer. This is done
|
|
// while holding the screen's lock - the events can then be queued for
|
|
// application processing with the lock released.
|
|
func (t *tScreen) collectEventsFromInput(buf *bytes.Buffer, expire bool) []Event {
|
|
|
|
res := make([]Event, 0, 20)
|
|
|
|
t.Lock()
|
|
defer t.Unlock()
|
|
|
|
for {
|
|
b := buf.Bytes()
|
|
if len(b) == 0 {
|
|
buf.Reset()
|
|
return res
|
|
}
|
|
|
|
partials := 0
|
|
|
|
if part, comp := t.parseRune(buf, &res); comp {
|
|
continue
|
|
} else if part {
|
|
partials++
|
|
}
|
|
|
|
if part, comp := t.parseFunctionKey(buf, &res); comp {
|
|
continue
|
|
} else if part {
|
|
partials++
|
|
}
|
|
|
|
// Only parse mouse records if this term claims to have
|
|
// mouse support
|
|
|
|
if t.ti.Mouse != "" {
|
|
if part, comp := t.parseXtermMouse(buf, &res); comp {
|
|
continue
|
|
} else if part {
|
|
partials++
|
|
}
|
|
|
|
if part, comp := t.parseSgrMouse(buf, &res); comp {
|
|
continue
|
|
} else if part {
|
|
partials++
|
|
}
|
|
}
|
|
|
|
if partials == 0 || expire {
|
|
if b[0] == '\x1b' {
|
|
if len(b) == 1 {
|
|
res = append(res, NewEventKey(KeyEsc, 0, ModNone))
|
|
t.escaped = false
|
|
} else {
|
|
t.escaped = true
|
|
}
|
|
buf.ReadByte()
|
|
continue
|
|
}
|
|
// Nothing was going to match, or we timed out
|
|
// waiting for more data -- just deliver the characters
|
|
// to the app & let them sort it out. Possibly we
|
|
// should only do this for control characters like ESC.
|
|
by, _ := buf.ReadByte()
|
|
mod := ModNone
|
|
if t.escaped {
|
|
t.escaped = false
|
|
mod = ModAlt
|
|
}
|
|
res = append(res, NewEventKey(KeyRune, rune(by), mod))
|
|
continue
|
|
}
|
|
|
|
// well we have some partial data, wait until we get
|
|
// some more
|
|
break
|
|
}
|
|
|
|
return res
|
|
}
|
|
|
|
func (t *tScreen) mainLoop() {
|
|
buf := &bytes.Buffer{}
|
|
for {
|
|
select {
|
|
case <-t.quit:
|
|
close(t.indoneq)
|
|
return
|
|
case <-t.sigwinch:
|
|
t.Lock()
|
|
t.cx = -1
|
|
t.cy = -1
|
|
t.resize()
|
|
t.cells.Invalidate()
|
|
t.draw()
|
|
t.Unlock()
|
|
continue
|
|
case <-t.keytimer.C:
|
|
// If the timer fired, and the current time
|
|
// is after the expiration of the escape sequence,
|
|
// then we assume the escape sequence reached it's
|
|
// conclusion, and process the chunk independently.
|
|
// This lets us detect conflicts such as a lone ESC.
|
|
if buf.Len() > 0 {
|
|
if time.Now().After(t.keyexpire) {
|
|
t.scanInput(buf, true)
|
|
}
|
|
}
|
|
if buf.Len() > 0 {
|
|
if !t.keytimer.Stop() {
|
|
select {
|
|
case <-t.keytimer.C:
|
|
default:
|
|
}
|
|
}
|
|
t.keytimer.Reset(time.Millisecond * 50)
|
|
}
|
|
case chunk := <-t.keychan:
|
|
buf.Write(chunk)
|
|
t.keyexpire = time.Now().Add(time.Millisecond * 50)
|
|
t.scanInput(buf, false)
|
|
if !t.keytimer.Stop() {
|
|
select {
|
|
case <-t.keytimer.C:
|
|
default:
|
|
}
|
|
}
|
|
if buf.Len() > 0 {
|
|
t.keytimer.Reset(time.Millisecond * 50)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func (t *tScreen) inputLoop() {
|
|
|
|
for {
|
|
chunk := make([]byte, 128)
|
|
n, e := t.in.Read(chunk)
|
|
switch e {
|
|
case io.EOF:
|
|
case nil:
|
|
default:
|
|
t.PostEvent(NewEventError(e))
|
|
return
|
|
}
|
|
t.keychan <- chunk[:n]
|
|
}
|
|
}
|
|
|
|
func (t *tScreen) Sync() {
|
|
t.Lock()
|
|
t.cx = -1
|
|
t.cy = -1
|
|
if !t.fini {
|
|
t.resize()
|
|
t.clear = true
|
|
t.cells.Invalidate()
|
|
t.draw()
|
|
}
|
|
t.Unlock()
|
|
}
|
|
|
|
func (t *tScreen) CharacterSet() string {
|
|
return t.charset
|
|
}
|
|
|
|
func (t *tScreen) RegisterRuneFallback(orig rune, fallback string) {
|
|
t.Lock()
|
|
t.fallback[orig] = fallback
|
|
t.Unlock()
|
|
}
|
|
|
|
func (t *tScreen) UnregisterRuneFallback(orig rune) {
|
|
t.Lock()
|
|
delete(t.fallback, orig)
|
|
t.Unlock()
|
|
}
|
|
|
|
func (t *tScreen) CanDisplay(r rune, checkFallbacks bool) bool {
|
|
|
|
if enc := t.encoder; enc != nil {
|
|
nb := make([]byte, 6)
|
|
ob := make([]byte, 6)
|
|
num := utf8.EncodeRune(ob, r)
|
|
|
|
enc.Reset()
|
|
dst, _, err := enc.Transform(nb, ob[:num], true)
|
|
if dst != 0 && err == nil && nb[0] != '\x1A' {
|
|
return true
|
|
}
|
|
}
|
|
// Terminal fallbacks always permitted, since we assume they are
|
|
// basically nearly perfect renditions.
|
|
if _, ok := t.acs[r]; ok {
|
|
return true
|
|
}
|
|
if !checkFallbacks {
|
|
return false
|
|
}
|
|
if _, ok := t.fallback[r]; ok {
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
func (t *tScreen) HasMouse() bool {
|
|
return len(t.mouse) != 0
|
|
}
|
|
|
|
func (t *tScreen) HasKey(k Key) bool {
|
|
if k == KeyRune {
|
|
return true
|
|
}
|
|
return t.keyexist[k]
|
|
}
|
|
|
|
func (t *tScreen) Resize(int, int, int, int) {}
|