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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,123 @@ | ||
| package cli | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "strings" | ||
|
|
||
| "github.com/eiannone/keyboard" | ||
| ) | ||
|
|
||
| type Editor struct { | ||
| History *History | ||
| } | ||
|
|
||
| func NewEditor(history *History) *Editor { | ||
| return &Editor{ | ||
| History: history, | ||
| } | ||
| } | ||
|
|
||
| func (ed *Editor) EditRequest(keyStream <-chan keyboard.KeyEvent, buffer string) (string, error) { | ||
| historyIndex := 0 | ||
|
|
||
| for e := range keyStream { | ||
| if e.Err != nil { | ||
| return buffer, e.Err | ||
| } | ||
|
|
||
| switch e.Key { | ||
| case keyboard.KeyCtrlC, keyboard.KeyCtrlD: | ||
| return buffer, fmt.Errorf("interrupted") | ||
| case keyboard.KeyCtrlS: | ||
| if buffer == "" { | ||
| return buffer, fmt.Errorf("cannot send empty request") | ||
| } | ||
|
|
||
| requet := strings.TrimSpace(buffer) | ||
|
|
||
| ed.History.AddRequest(requet) | ||
|
|
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| return requet, nil | ||
| case keyboard.KeyEsc: | ||
| return "", nil | ||
|
|
||
| case keyboard.KeySpace: | ||
| fmt.Print(" ") | ||
|
|
||
| buffer += " " | ||
| case keyboard.KeyEnter: | ||
| fmt.Print("\n") | ||
|
|
||
| buffer += "\n" | ||
| case keyboard.KeyBackspace, keyboard.KeyDelete, MacOSDeleteKey: | ||
| if buffer == "" { | ||
| continue | ||
| } | ||
|
|
||
| if buffer[len(buffer)-1] == '\n' { | ||
| buffer = buffer[:len(buffer)-1] | ||
|
|
||
| fmt.Print(LineUp) | ||
|
|
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| startPrevLine := strings.LastIndex(buffer, "\n") | ||
| if startPrevLine == -1 { | ||
| startPrevLine = 0 | ||
| } else { | ||
| startPrevLine++ | ||
| } | ||
|
|
||
| fmt.Print(buffer[startPrevLine:]) | ||
| } else { | ||
| fmt.Print("\b \b") | ||
| buffer = buffer[:len(buffer)-1] | ||
| } | ||
| case keyboard.KeyArrowUp: | ||
| historyIndex++ | ||
| req := ed.History.GetRequst(historyIndex) | ||
|
|
||
| if req == "" { | ||
| historyIndex-- | ||
| continue | ||
| } | ||
|
|
||
| ed.clearInput(buffer) | ||
|
|
||
| fmt.Print(req) | ||
| buffer = req | ||
| case keyboard.KeyArrowDown: | ||
| historyIndex-- | ||
| req := ed.History.GetRequst(historyIndex) | ||
|
|
||
| if req == "" { | ||
| historyIndex++ | ||
| continue | ||
| } | ||
|
|
||
| ed.clearInput(buffer) | ||
|
|
||
| fmt.Print(req) | ||
| buffer = req | ||
| default: | ||
| if e.Key > 0 { | ||
| continue | ||
| } | ||
|
|
||
| fmt.Print(string(e.Rune)) | ||
|
|
||
| buffer += string(e.Rune) | ||
| } | ||
| } | ||
|
|
||
| return buffer, fmt.Errorf("keyboard stream was unexpectably closed") | ||
| } | ||
|
|
||
| func (ed *Editor) clearInput(buffer string) { | ||
| for i := 0; i < len(buffer); i++ { | ||
| if buffer[i] == '\n' { | ||
| fmt.Print(LineUp) | ||
| fmt.Print(LineClear) | ||
| } else { | ||
| fmt.Print("\b \b") | ||
| } | ||
| } | ||
| } |