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authorDrew DeVault <sir@cmpwn.com>2018-02-26 22:41:54 -0500
committerDrew DeVault <sir@cmpwn.com>2018-02-26 22:42:01 -0500
commit661e3ec2a4dd97d4a8a8eab4f281b088770a6af2 (patch)
tree1f94f9a168642617690934deba2e5b712abb1834 /ui/exline.go
parent07f7cac2f3c5b7b74d16296d5afb57ff7e908130 (diff)
Implement basic ex line input
TODO: - scrolling - commit/cancel - command history (via an external command history provider) - tab completion (via an external tab completion provider)
Diffstat (limited to 'ui/exline.go')
-rw-r--r--ui/exline.go127
1 files changed, 127 insertions, 0 deletions
diff --git a/ui/exline.go b/ui/exline.go
new file mode 100644
index 0000000..a377cd7
--- /dev/null
+++ b/ui/exline.go
@@ -0,0 +1,127 @@
+package ui
+
+import (
+ tb "github.com/nsf/termbox-go"
+)
+
+// TODO: history
+// TODO: tab completion
+// TODO: commit
+// TODO: cancel (via esc/ctrl+c)
+// TODO: scrolling
+
+type ExLine struct {
+ command *string
+ commit func(cmd *string)
+ index int
+ scroll int
+
+ onInvalidate func(d Drawable)
+}
+
+func NewExLine() *ExLine {
+ cmd := ""
+ return &ExLine{command: &cmd}
+}
+
+func (ex *ExLine) OnInvalidate(onInvalidate func(d Drawable)) {
+ ex.onInvalidate = onInvalidate
+}
+
+func (ex *ExLine) Invalidate() {
+ if ex.onInvalidate != nil {
+ ex.onInvalidate(ex)
+ }
+}
+
+func (ex *ExLine) Draw(ctx *Context) {
+ cell := tb.Cell{
+ Fg: tb.ColorDefault,
+ Bg: tb.ColorDefault,
+ Ch: ' ',
+ }
+ ctx.Fill(0, 0, ctx.Width(), ctx.Height(), cell)
+ ctx.Printf(0, 0, cell, ":%s", *ex.command)
+ tb.SetCursor(ctx.X()+ex.index-ex.scroll+1, ctx.Y())
+}
+
+func (ex *ExLine) insert(ch rune) {
+ newCmd := (*ex.command)[:ex.index] + string(ch) + (*ex.command)[ex.index:]
+ ex.command = &newCmd
+ ex.index++
+ ex.Invalidate()
+}
+
+func (ex *ExLine) deleteWord() {
+ // TODO: Break on any of / " '
+ if len(*ex.command) == 0 {
+ return
+ }
+ i := ex.index - 1
+ if (*ex.command)[i] == ' ' {
+ i--
+ }
+ for ; i >= 0; i-- {
+ if (*ex.command)[i] == ' ' {
+ break
+ }
+ }
+ newCmd := (*ex.command)[:i+1] + (*ex.command)[ex.index:]
+ ex.command = &newCmd
+ ex.index = i + 1
+ ex.Invalidate()
+}
+
+func (ex *ExLine) deleteChar() {
+ if len(*ex.command) > 0 && ex.index != len(*ex.command) {
+ newCmd := (*ex.command)[:ex.index] + (*ex.command)[ex.index+1:]
+ ex.command = &newCmd
+ ex.Invalidate()
+ }
+}
+
+func (ex *ExLine) backspace() {
+ if len(*ex.command) > 0 && ex.index != 0 {
+ newCmd := (*ex.command)[:ex.index-1] + (*ex.command)[ex.index:]
+ ex.command = &newCmd
+ ex.index--
+ ex.Invalidate()
+ }
+}
+
+func (ex *ExLine) Event(event tb.Event) bool {
+ switch event.Type {
+ case tb.EventKey:
+ switch event.Key {
+ case tb.KeySpace:
+ ex.insert(' ')
+ case tb.KeyBackspace, tb.KeyBackspace2:
+ ex.backspace()
+ case tb.KeyCtrlD, tb.KeyDelete:
+ ex.deleteChar()
+ case tb.KeyCtrlB, tb.KeyArrowLeft:
+ if ex.index > 0 {
+ ex.index--
+ ex.Invalidate()
+ }
+ case tb.KeyCtrlF, tb.KeyArrowRight:
+ if ex.index < len(*ex.command) {
+ ex.index++
+ ex.Invalidate()
+ }
+ case tb.KeyCtrlA, tb.KeyHome:
+ ex.index = 0
+ ex.Invalidate()
+ case tb.KeyCtrlE, tb.KeyEnd:
+ ex.index = len(*ex.command)
+ ex.Invalidate()
+ case tb.KeyCtrlW:
+ ex.deleteWord()
+ default:
+ if event.Ch != 0 {
+ ex.insert(event.Ch)
+ }
+ }
+ }
+ return true
+}