Make Jira module list interactable

Using the todo module as a template, this change adds interactivity
to the Jira module to allow selecting individual issues and opening
them in a web browser.

The j and k keys (or arrow keys) move up and down, and pressing
enter will open the URL for a given issue in the system's default
URL handler.

jira/widget.go

@@ -3,18 +3,24 @@ package jira
 import (
 	"fmt"
 
+	"github.com/gdamore/tcell"
 	"github.com/senorprogrammer/wtf/wtf"
 )
 
 type Widget struct {
 	wtf.TextWidget
+
+	result   *SearchResult
+	selected int
 }
 
 func NewWidget() *Widget {
 	widget := Widget{
-		TextWidget: wtf.NewTextWidget(" Jira ", "jira", false),
+		TextWidget: wtf.NewTextWidget(" Jira ", "jira", true),
 	}
+	widget.unselect()
 
+	widget.View.SetInputCapture(widget.keyboardIntercept)
 	return &widget
 }
 
@@ -29,12 +35,24 @@ func (widget *Widget) Refresh() {
 
 	widget.UpdateRefreshedAt()
 
-	var content string
 	if err != nil {
+		widget.result = nil
 		widget.View.SetWrap(true)
 		widget.View.SetTitle(widget.Name)
-		content = err.Error()
+		widget.View.SetText(err.Error())
 	} else {
+		widget.result = searchResult
+	}
+
+	widget.display()
+}
+
+/* -------------------- Unexported Functions -------------------- */
+
+func (widget *Widget) display() {
+	if widget.result == nil {
+		return
+	}
 	widget.View.SetWrap(false)
 	widget.View.SetTitle(
 		fmt.Sprintf(
@@ -43,13 +61,34 @@ func (widget *Widget) Refresh() {
 			wtf.Config.UString("wtf.mods.jira.project"),
 		),
 	)
-		content = widget.contentFrom(searchResult)
+	widget.View.SetText(fmt.Sprintf("%s", widget.contentFrom(widget.result)))
 }
 
-	widget.View.SetText(content)
+func (widget *Widget) next() {
+	widget.selected++
+	if widget.result != nil && widget.selected >= len(widget.result.Issues) {
+		widget.selected = 0
+	}
 }
 
-/* -------------------- Unexported Functions -------------------- */
+func (widget *Widget) prev() {
+	widget.selected--
+	if widget.selected < 0 && widget.result != nil {
+		widget.selected = len(widget.result.Issues) - 1
+	}
+}
+
+func (widget *Widget) openItem() {
+	sel := widget.selected
+	if sel >= 0 && widget.result != nil && sel < len(widget.result.Issues) {
+		issue := &widget.result.Issues[widget.selected]
+		wtf.OpenFile(wtf.Config.UString("wtf.mods.jira.domain") + "/browse/" + issue.Key)
+	}
+}
+
+func (widget *Widget) unselect() {
+	widget.selected = -1
+}
 
 func (widget *Widget) contentFrom(searchResult *SearchResult) string {
 	str := " [red]Assigned Issues[white]\n"
@@ -60,7 +99,7 @@ func (widget *Widget) contentFrom(searchResult *SearchResult) string {
 			widget.issueTypeColor(&issue),
 			issue.IssueFields.IssueType.Name,
 			issue.Key,
-			wtf.RowColor("jira", idx),
+			widget.rowColor(idx),
 			issue.IssueFields.Summary,
 		)
 	}
@@ -68,6 +107,15 @@ func (widget *Widget) contentFrom(searchResult *SearchResult) string {
 	return str
 }
 
+func (widget *Widget) rowColor(idx int) string {
+	if widget.View.HasFocus() && (idx == widget.selected) {
+		foreColor := wtf.Config.UString("wtf.mods.jira.colors.highlight.fore", "black")
+		backColor := wtf.Config.UString("wtf.mods.jira.colors.highlight.back", "white")
+		return fmt.Sprintf("%s:%s", foreColor, backColor)
+	}
+	return wtf.RowColor("jira", idx)
+}
+
 func (widget *Widget) issueTypeColor(issue *Issue) string {
 	switch issue.IssueFields.IssueType.Name {
 	case "Bug":
@@ -98,3 +146,42 @@ func getProjects() []string {
 	}
 	return ret
 }
+
+func (widget *Widget) keyboardIntercept(event *tcell.EventKey) *tcell.EventKey {
+	switch string(event.Rune()) {
+	case "j":
+		// Select the next item down
+		widget.next()
+		widget.display()
+		return nil
+	case "k":
+		// Select the next item up
+		widget.prev()
+		widget.display()
+		return nil
+	}
+
+	switch event.Key() {
+	case tcell.KeyDown:
+		// Select the next item down
+		widget.next()
+		widget.display()
+		return nil
+	case tcell.KeyEnter:
+		widget.openItem()
+		return nil
+	case tcell.KeyEsc:
+		// Unselect the current row
+		widget.unselect()
+		widget.display()
+		return event
+	case tcell.KeyUp:
+		// Select the next item up
+		widget.prev()
+		widget.display()
+		return nil
+	default:
+		// Pass it along
+		return event
+	}
+}