diff options
author | Drew DeVault <sir@cmpwn.com> | 2018-02-26 22:41:54 -0500 |
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committer | Drew DeVault <sir@cmpwn.com> | 2018-02-26 22:42:01 -0500 |
commit | 661e3ec2a4dd97d4a8a8eab4f281b088770a6af2 (patch) | |
tree | 1f94f9a168642617690934deba2e5b712abb1834 /ui/exline.go | |
parent | 07f7cac2f3c5b7b74d16296d5afb57ff7e908130 (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.go | 127 |
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 +} |