forked from zyedidia/micro
/
messenger.go
669 lines (592 loc) · 16 KB
/
messenger.go
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package main
import (
"bufio"
"bytes"
"encoding/gob"
"fmt"
"os"
"strconv"
"github.com/mattn/go-runewidth"
"github.com/zyedidia/clipboard"
"github.com/zyedidia/micro/cmd/micro/shellwords"
"github.com/zyedidia/tcell"
)
// TermMessage sends a message to the user in the terminal. This usually occurs before
// micro has been fully initialized -- ie if there is an error in the syntax highlighting
// regular expressions
// The function must be called when the screen is not initialized
// This will write the message, and wait for the user
// to press and key to continue
func TermMessage(msg ...interface{}) {
screenWasNil := screen == nil
if !screenWasNil {
screen.Fini()
screen = nil
}
fmt.Println(msg...)
fmt.Print("\nPress enter to continue")
reader := bufio.NewReader(os.Stdin)
reader.ReadString('\n')
if !screenWasNil {
InitScreen()
}
}
// TermError sends an error to the user in the terminal. Like TermMessage except formatted
// as an error
func TermError(filename string, lineNum int, err string) {
TermMessage(filename + ", " + strconv.Itoa(lineNum) + ": " + err)
}
// Messenger is an object that makes it easy to send messages to the user
// and get input from the user
type Messenger struct {
log *Buffer
// Are we currently prompting the user?
hasPrompt bool
// Is there a message to print
hasMessage bool
// Message to print
message string
// The user's response to a prompt
response string
// style to use when drawing the message
style tcell.Style
// We have to keep track of the cursor for prompting
cursorx int
// This map stores the history for all the different kinds of uses Prompt has
// It's a map of history type -> history array
history map[string][]string
historyNum int
// Is the current message a message from the gutter
gutterMessage bool
}
// AddLog sends a message to the log view
func (m *Messenger) AddLog(msg ...interface{}) {
logMessage := fmt.Sprint(msg...)
buffer := m.getBuffer()
buffer.insert(buffer.End(), []byte(logMessage+"\n"))
buffer.Cursor.Loc = buffer.End()
buffer.Cursor.Relocate()
}
func (m *Messenger) getBuffer() *Buffer {
if m.log == nil {
m.log = NewBufferFromString("", "")
m.log.name = "Log"
}
return m.log
}
// Message sends a message to the user
func (m *Messenger) Message(msg ...interface{}) {
displayMessage := fmt.Sprint(msg...)
// only display a new message if there isn't an active prompt
// this is to prevent overwriting an existing prompt to the user
if m.hasPrompt == false {
// if there is no active prompt then style and display the message as normal
m.message = displayMessage
m.style = defStyle
if _, ok := colorscheme["message"]; ok {
m.style = colorscheme["message"]
}
m.hasMessage = true
}
// add the message to the log regardless of active prompts
m.AddLog(displayMessage)
}
// Error sends an error message to the user
func (m *Messenger) Error(msg ...interface{}) {
buf := new(bytes.Buffer)
fmt.Fprint(buf, msg...)
// only display a new message if there isn't an active prompt
// this is to prevent overwriting an existing prompt to the user
if m.hasPrompt == false {
// if there is no active prompt then style and display the message as normal
m.message = buf.String()
m.style = defStyle.
Foreground(tcell.ColorBlack).
Background(tcell.ColorMaroon)
if _, ok := colorscheme["error-message"]; ok {
m.style = colorscheme["error-message"]
}
m.hasMessage = true
}
// add the message to the log regardless of active prompts
m.AddLog(buf.String())
}
func (m *Messenger) PromptText(msg ...interface{}) {
displayMessage := fmt.Sprint(msg...)
// if there is no active prompt then style and display the message as normal
m.message = displayMessage
m.style = defStyle
if _, ok := colorscheme["message"]; ok {
m.style = colorscheme["message"]
}
m.hasMessage = true
// add the message to the log regardless of active prompts
m.AddLog(displayMessage)
}
// YesNoPrompt asks the user a yes or no question (waits for y or n) and returns the result
func (m *Messenger) YesNoPrompt(prompt string) (bool, bool) {
m.hasPrompt = true
m.PromptText(prompt)
_, h := screen.Size()
for {
m.Clear()
m.Display()
screen.ShowCursor(Count(m.message), h-1)
screen.Show()
event := <-events
switch e := event.(type) {
case *tcell.EventKey:
switch e.Key() {
case tcell.KeyRune:
if e.Rune() == 'y' || e.Rune() == 'Y' {
m.AddLog("\t--> y")
m.hasPrompt = false
return true, false
} else if e.Rune() == 'n' || e.Rune() == 'N' {
m.AddLog("\t--> n")
m.hasPrompt = false
return false, false
}
case tcell.KeyCtrlC, tcell.KeyCtrlQ, tcell.KeyEscape:
m.AddLog("\t--> (cancel)")
m.Clear()
m.Reset()
m.hasPrompt = false
return false, true
}
}
}
}
// LetterPrompt gives the user a prompt and waits for a one letter response
func (m *Messenger) LetterPrompt(prompt string, responses ...rune) (rune, bool) {
m.hasPrompt = true
m.PromptText(prompt)
_, h := screen.Size()
for {
m.Clear()
m.Display()
screen.ShowCursor(Count(m.message), h-1)
screen.Show()
event := <-events
switch e := event.(type) {
case *tcell.EventKey:
switch e.Key() {
case tcell.KeyRune:
for _, r := range responses {
if e.Rune() == r {
m.AddLog("\t--> " + string(r))
m.Clear()
m.Reset()
m.hasPrompt = false
return r, false
}
}
case tcell.KeyCtrlC, tcell.KeyCtrlQ, tcell.KeyEscape:
m.AddLog("\t--> (cancel)")
m.Clear()
m.Reset()
m.hasPrompt = false
return ' ', true
}
}
}
}
// Completion represents a type of completion
type Completion int
const (
NoCompletion Completion = iota
FileCompletion
CommandCompletion
HelpCompletion
OptionCompletion
PluginCmdCompletion
PluginNameCompletion
OptionValueCompletion
)
// Prompt sends the user a message and waits for a response to be typed in
// This function blocks the main loop while waiting for input
func (m *Messenger) Prompt(prompt, placeholder, historyType string, completionTypes ...Completion) (string, bool) {
m.hasPrompt = true
m.PromptText(prompt)
if _, ok := m.history[historyType]; !ok {
m.history[historyType] = []string{""}
} else {
m.history[historyType] = append(m.history[historyType], "")
}
m.historyNum = len(m.history[historyType]) - 1
response, canceled := placeholder, true
m.response = response
m.cursorx = Count(placeholder)
RedrawAll()
for m.hasPrompt {
var suggestions []string
m.Clear()
event := <-events
switch e := event.(type) {
case *tcell.EventResize:
for _, t := range tabs {
t.Resize()
}
RedrawAll()
case *tcell.EventKey:
switch e.Key() {
case tcell.KeyCtrlQ, tcell.KeyCtrlC, tcell.KeyEscape:
// Cancel
m.AddLog("\t--> (cancel)")
m.hasPrompt = false
case tcell.KeyEnter:
// User is done entering their response
m.AddLog("\t--> " + m.response)
m.hasPrompt = false
response, canceled = m.response, false
m.history[historyType][len(m.history[historyType])-1] = response
case tcell.KeyTab:
args, err := shellwords.Split(m.response)
if err != nil {
break
}
currentArg := ""
currentArgNum := 0
if len(args) > 0 {
currentArgNum = len(args) - 1
currentArg = args[currentArgNum]
}
var completionType Completion
if completionTypes[0] == CommandCompletion && currentArgNum > 0 {
if command, ok := commands[args[0]]; ok {
completionTypes = append([]Completion{CommandCompletion}, command.completions...)
}
}
if currentArgNum >= len(completionTypes) {
completionType = completionTypes[len(completionTypes)-1]
} else {
completionType = completionTypes[currentArgNum]
}
var chosen string
if completionType == FileCompletion {
chosen, suggestions = FileComplete(currentArg)
} else if completionType == CommandCompletion {
chosen, suggestions = CommandComplete(currentArg)
} else if completionType == HelpCompletion {
chosen, suggestions = HelpComplete(currentArg)
} else if completionType == OptionCompletion {
chosen, suggestions = OptionComplete(currentArg)
} else if completionType == OptionValueCompletion {
if currentArgNum-1 > 0 {
chosen, suggestions = OptionValueComplete(args[currentArgNum-1], currentArg)
}
} else if completionType == PluginCmdCompletion {
chosen, suggestions = PluginCmdComplete(currentArg)
} else if completionType == PluginNameCompletion {
chosen, suggestions = PluginNameComplete(currentArg)
} else if completionType < NoCompletion {
chosen, suggestions = PluginComplete(completionType, currentArg)
}
if len(suggestions) > 1 {
chosen = chosen + CommonSubstring(suggestions...)
}
if len(suggestions) != 0 && chosen != "" {
m.response = shellwords.Join(append(args[:len(args)-1], chosen)...)
m.cursorx = Count(m.response)
}
}
}
m.HandleEvent(event, m.history[historyType])
m.Clear()
for _, v := range tabs[curTab].Views {
v.Display()
}
DisplayTabs()
m.Display()
if len(suggestions) > 1 {
m.DisplaySuggestions(suggestions)
}
screen.Show()
}
m.Clear()
m.Reset()
return response, canceled
}
// UpHistory fetches the previous item in the history
func (m *Messenger) UpHistory(history []string) {
if m.historyNum > 0 {
m.historyNum--
m.response = history[m.historyNum]
m.cursorx = Count(m.response)
}
}
// DownHistory fetches the next item in the history
func (m *Messenger) DownHistory(history []string) {
if m.historyNum < len(history)-1 {
m.historyNum++
m.response = history[m.historyNum]
m.cursorx = Count(m.response)
}
}
// CursorLeft moves the cursor one character left
func (m *Messenger) CursorLeft() {
if m.cursorx > 0 {
m.cursorx--
}
}
// CursorRight moves the cursor one character right
func (m *Messenger) CursorRight() {
if m.cursorx < Count(m.response) {
m.cursorx++
}
}
// Start moves the cursor to the start of the line
func (m *Messenger) Start() {
m.cursorx = 0
}
// End moves the cursor to the end of the line
func (m *Messenger) End() {
m.cursorx = Count(m.response)
}
// Backspace deletes one character
func (m *Messenger) Backspace() {
if m.cursorx > 0 {
m.response = string([]rune(m.response)[:m.cursorx-1]) + string([]rune(m.response)[m.cursorx:])
m.cursorx--
}
}
// Paste pastes the clipboard
func (m *Messenger) Paste() {
clip, _ := clipboard.ReadAll("clipboard")
m.response = Insert(m.response, m.cursorx, clip)
m.cursorx += Count(clip)
}
// WordLeft moves the cursor one word to the left
func (m *Messenger) WordLeft() {
response := []rune(m.response)
m.CursorLeft()
if m.cursorx <= 0 {
return
}
for IsWhitespace(response[m.cursorx]) {
if m.cursorx <= 0 {
return
}
m.CursorLeft()
}
m.CursorLeft()
for IsWordChar(string(response[m.cursorx])) {
if m.cursorx <= 0 {
return
}
m.CursorLeft()
}
m.CursorRight()
}
// WordRight moves the cursor one word to the right
func (m *Messenger) WordRight() {
response := []rune(m.response)
if m.cursorx >= len(response) {
return
}
for IsWhitespace(response[m.cursorx]) {
m.CursorRight()
if m.cursorx >= len(response) {
m.CursorRight()
return
}
}
m.CursorRight()
if m.cursorx >= len(response) {
return
}
for IsWordChar(string(response[m.cursorx])) {
m.CursorRight()
if m.cursorx >= len(response) {
return
}
}
}
// DeleteWordLeft deletes one word to the left
func (m *Messenger) DeleteWordLeft() {
m.WordLeft()
m.response = string([]rune(m.response)[:m.cursorx])
}
// HandleEvent handles an event for the prompter
func (m *Messenger) HandleEvent(event tcell.Event, history []string) {
switch e := event.(type) {
case *tcell.EventKey:
switch e.Key() {
case tcell.KeyCtrlA:
m.Start()
case tcell.KeyCtrlE:
m.End()
case tcell.KeyUp:
m.UpHistory(history)
case tcell.KeyDown:
m.DownHistory(history)
case tcell.KeyLeft:
if e.Modifiers() == tcell.ModCtrl {
m.Start()
} else if e.Modifiers() == tcell.ModAlt || e.Modifiers() == tcell.ModMeta {
m.WordLeft()
} else {
m.CursorLeft()
}
case tcell.KeyRight:
if e.Modifiers() == tcell.ModCtrl {
m.End()
} else if e.Modifiers() == tcell.ModAlt || e.Modifiers() == tcell.ModMeta {
m.WordRight()
} else {
m.CursorRight()
}
case tcell.KeyBackspace2, tcell.KeyBackspace:
if e.Modifiers() == tcell.ModCtrl || e.Modifiers() == tcell.ModAlt || e.Modifiers() == tcell.ModMeta {
m.DeleteWordLeft()
} else {
m.Backspace()
}
case tcell.KeyCtrlW:
m.DeleteWordLeft()
case tcell.KeyCtrlV:
m.Paste()
case tcell.KeyCtrlF:
m.WordRight()
case tcell.KeyCtrlB:
m.WordLeft()
case tcell.KeyRune:
m.response = Insert(m.response, m.cursorx, string(e.Rune()))
m.cursorx++
}
history[m.historyNum] = m.response
case *tcell.EventPaste:
clip := e.Text()
m.response = Insert(m.response, m.cursorx, clip)
m.cursorx += Count(clip)
case *tcell.EventMouse:
x, y := e.Position()
x -= Count(m.message)
button := e.Buttons()
_, screenH := screen.Size()
if y == screenH-1 {
switch button {
case tcell.Button1:
m.cursorx = x
if m.cursorx < 0 {
m.cursorx = 0
} else if m.cursorx > Count(m.response) {
m.cursorx = Count(m.response)
}
}
}
}
}
// Reset resets the messenger's cursor, message and response
func (m *Messenger) Reset() {
m.cursorx = 0
m.message = ""
m.response = ""
}
// Clear clears the line at the bottom of the editor
func (m *Messenger) Clear() {
w, h := screen.Size()
for x := 0; x < w; x++ {
screen.SetContent(x, h-1, ' ', nil, defStyle)
}
}
func (m *Messenger) DisplaySuggestions(suggestions []string) {
w, screenH := screen.Size()
y := screenH - 2
statusLineStyle := defStyle.Reverse(true)
if style, ok := colorscheme["statusline"]; ok {
statusLineStyle = style
}
for x := 0; x < w; x++ {
screen.SetContent(x, y, ' ', nil, statusLineStyle)
}
x := 0
for _, suggestion := range suggestions {
for _, c := range suggestion {
screen.SetContent(x, y, c, nil, statusLineStyle)
x++
}
screen.SetContent(x, y, ' ', nil, statusLineStyle)
x++
}
}
// Display displays messages or prompts
func (m *Messenger) Display() {
_, h := screen.Size()
if m.hasMessage {
if m.hasPrompt || globalSettings["infobar"].(bool) {
runes := []rune(m.message + m.response)
posx := 0
for x := 0; x < len(runes); x++ {
screen.SetContent(posx, h-1, runes[x], nil, m.style)
posx += runewidth.RuneWidth(runes[x])
}
}
}
if m.hasPrompt {
screen.ShowCursor(Count(m.message)+m.cursorx, h-1)
screen.Show()
}
}
// LoadHistory attempts to load user history from configDir/buffers/history
// into the history map
// The savehistory option must be on
func (m *Messenger) LoadHistory() {
if GetGlobalOption("savehistory").(bool) {
file, err := os.Open(configDir + "/buffers/history")
defer file.Close()
var decodedMap map[string][]string
if err == nil {
decoder := gob.NewDecoder(file)
err = decoder.Decode(&decodedMap)
if err != nil {
m.Error("Error loading history:", err)
return
}
}
if decodedMap != nil {
m.history = decodedMap
} else {
m.history = make(map[string][]string)
}
} else {
m.history = make(map[string][]string)
}
}
// SaveHistory saves the user's command history to configDir/buffers/history
// only if the savehistory option is on
func (m *Messenger) SaveHistory() {
if GetGlobalOption("savehistory").(bool) {
// Don't save history past 100
for k, v := range m.history {
if len(v) > 100 {
m.history[k] = v[len(m.history[k])-100:]
}
}
file, err := os.Create(configDir + "/buffers/history")
defer file.Close()
if err == nil {
encoder := gob.NewEncoder(file)
err = encoder.Encode(m.history)
if err != nil {
m.Error("Error saving history:", err)
return
}
}
}
}
// A GutterMessage is a message displayed on the side of the editor
type GutterMessage struct {
lineNum int
msg string
kind int
}
// These are the different types of messages
const (
// GutterInfo represents a simple info message
GutterInfo = iota
// GutterWarning represents a compiler warning
GutterWarning
// GutterError represents a compiler error
GutterError
)