diff options
author | Jeffas <dev@jeffas.io> | 2019-07-26 14:29:40 +0100 |
---|---|---|
committer | Drew DeVault <sir@cmpwn.com> | 2019-07-26 14:39:42 -0400 |
commit | cded067bc3919a77b17feedd877e4590e7c95f4a (patch) | |
tree | f359c28abd705167e3bf013faf8d4d1af4887f29 /lib | |
parent | aabe3d9b3a58efd9f0ad9b39917b85092d0955a1 (diff) | |
download | aerc-cded067bc3919a77b17feedd877e4590e7c95f4a.tar.gz |
Add tab completion to textinputs
This adds tab completion to textinput components. They can be configured with a completion function. This function is called when the user presses <tab>. The first completion is initially shown to the user inserted into the text. Repeated presses of <tab> or <backtab> cycle through the completions list. The completions list is invalidated when any other non-tab-like key is pressed. Also changed is some logic for current completion generation so that all available commands are returned when <tab> is pressed with no current text and similarly for arguments of commands.
Diffstat (limited to 'lib')
-rw-r--r-- | lib/ui/textinput.go | 84 |
1 files changed, 74 insertions, 10 deletions
diff --git a/lib/ui/textinput.go b/lib/ui/textinput.go index 2feeb84..e5a2337 100644 --- a/lib/ui/textinput.go +++ b/lib/ui/textinput.go @@ -5,20 +5,23 @@ import ( "github.com/mattn/go-runewidth" ) -// TODO: Attach history and tab completion providers +// TODO: Attach history providers // TODO: scrolling type TextInput struct { Invalidatable - cells int - ctx *Context - focus bool - index int - password bool - prompt string - scroll int - text []rune - change []func(ti *TextInput) + cells int + ctx *Context + focus bool + index int + password bool + prompt string + scroll int + text []rune + change []func(ti *TextInput) + tabcomplete func(s string) []string + completions []string + completeIndex int } // Creates a new TextInput. TextInputs will render a "textbox" in the entire @@ -42,6 +45,12 @@ func (ti *TextInput) Prompt(prompt string) *TextInput { return ti } +func (ti *TextInput) TabComplete( + tabcomplete func(s string) []string) *TextInput { + ti.tabcomplete = tabcomplete + return ti +} + func (ti *TextInput) String() string { return string(ti.text) } @@ -161,6 +170,41 @@ func (ti *TextInput) backspace() { } } +func (ti *TextInput) nextCompletion() { + if ti.completions == nil { + if ti.tabcomplete == nil { + return + } + ti.completions = ti.tabcomplete(ti.StringLeft()) + ti.completeIndex = 0 + } else { + ti.completeIndex++ + if ti.completeIndex >= len(ti.completions) { + ti.completeIndex = 0 + } + } + if len(ti.completions) > 0 { + ti.Set(ti.completions[ti.completeIndex] + ti.StringRight()) + } +} + +func (ti *TextInput) previousCompletion() { + if ti.completions == nil || len(ti.completions) == 0 { + return + } + ti.completeIndex-- + if ti.completeIndex < 0 { + ti.completeIndex = len(ti.completions) - 1 + } + if len(ti.completions) > 0 { + ti.Set(ti.completions[ti.completeIndex] + ti.StringRight()) + } +} + +func (ti *TextInput) invalidateCompletions() { + ti.completions = nil +} + func (ti *TextInput) onChange() { for _, change := range ti.change { change(ti) @@ -176,32 +220,52 @@ func (ti *TextInput) Event(event tcell.Event) bool { case *tcell.EventKey: switch event.Key() { case tcell.KeyBackspace, tcell.KeyBackspace2: + ti.invalidateCompletions() ti.backspace() case tcell.KeyCtrlD, tcell.KeyDelete: + ti.invalidateCompletions() ti.deleteChar() case tcell.KeyCtrlB, tcell.KeyLeft: + ti.invalidateCompletions() if ti.index > 0 { ti.index-- ti.ensureScroll() ti.Invalidate() } case tcell.KeyCtrlF, tcell.KeyRight: + ti.invalidateCompletions() if ti.index < len(ti.text) { ti.index++ ti.ensureScroll() ti.Invalidate() } case tcell.KeyCtrlA, tcell.KeyHome: + ti.invalidateCompletions() ti.index = 0 ti.ensureScroll() ti.Invalidate() case tcell.KeyCtrlE, tcell.KeyEnd: + ti.invalidateCompletions() ti.index = len(ti.text) ti.ensureScroll() ti.Invalidate() case tcell.KeyCtrlW: + ti.invalidateCompletions() ti.deleteWord() + case tcell.KeyTab: + if ti.tabcomplete != nil { + ti.nextCompletion() + } else { + ti.insert('\t') + } + ti.Invalidate() + case tcell.KeyBacktab: + if ti.tabcomplete != nil { + ti.previousCompletion() + } + ti.Invalidate() case tcell.KeyRune: + ti.invalidateCompletions() ti.insert(event.Rune()) } } |