13 "github.com/go-errors/errors"
14 "github.com/layeh/gopher-luar"
15 "github.com/mattn/go-isatty"
16 "github.com/mitchellh/go-homedir"
17 "github.com/yuin/gopher-lua"
18 "github.com/zyedidia/clipboard"
19 "github.com/zyedidia/tcell"
20 "github.com/zyedidia/tcell/encoding"
24 synLinesUp = 75 // How many lines up to look to do syntax highlighting
25 synLinesDown = 75 // How many lines down to look to do syntax highlighting
26 doubleClickThreshold = 400 // How many milliseconds to wait before a second click is not a double click
27 undoThreshold = 500 // If two events are less than n milliseconds apart, undo both of them
28 autosaveTime = 8 // Number of seconds to wait before autosaving
35 // Object to send messages and prompts to the user
38 // The default highlighting style
39 // This simply defines the default foreground and background colors
42 // Where the user's configuration is
43 // This should be $XDG_CONFIG_HOME/micro
44 // If $XDG_CONFIG_HOME is not set, it is ~/.config/micro
47 // Version is the version number or commit hash
48 // These variables should be set by the linker when compiling
49 Version = "0.0.0-unknown"
50 CommitHash = "Unknown"
51 CompileDate = "Unknown"
54 // This is the VM that runs the plugins
59 // This is the currently open tab
60 // It's just an index to the tab in the tabs array
63 // Channel of jobs running in the background
66 events chan tcell.Event
70 // LoadInput determines which files should be loaded into buffers
71 // based on the input stored in flag.Args()
72 func LoadInput() []*Buffer {
73 // There are a number of ways micro should start given its input
75 // 1. If it is given a files in flag.Args(), it should open those
77 // 2. If there is no input file and the input is not a terminal, that means
78 // something is being piped in and the stdin should be opened in an
81 // 3. If there is no input file and the input is a terminal, an empty buffer
89 if len(flag.Args()) > 0 {
91 // We go through each file and load it
92 for i := 0; i < len(flag.Args()); i++ {
93 filename = flag.Args()[i]
95 // Check that the file exists
97 if _, e := os.Stat(filename); e == nil {
98 // If it exists we load it into a buffer
99 input, err = os.Open(filename)
106 // If the file didn't exist, input will be empty, and we'll open an empty buffer
108 buffers = append(buffers, NewBuffer(input, filename))
110 buffers = append(buffers, NewBuffer(strings.NewReader(""), filename))
113 } else if !isatty.IsTerminal(os.Stdin.Fd()) {
115 // The input is not a terminal, so something is being piped in
116 // and we should read from stdin
117 input, err = ioutil.ReadAll(os.Stdin)
119 TermMessage("Error reading from stdin: ", err)
122 buffers = append(buffers, NewBuffer(strings.NewReader(string(input)), filename))
124 // Option 3, just open an empty buffer
125 buffers = append(buffers, NewBuffer(strings.NewReader(string(input)), filename))
131 // InitConfigDir finds the configuration directory for micro according to the XDG spec.
132 // If no directory is found, it creates one.
133 func InitConfigDir() {
134 xdgHome := os.Getenv("XDG_CONFIG_HOME")
136 // The user has not set $XDG_CONFIG_HOME so we should act like it was set to ~/.config
137 home, err := homedir.Dir()
139 TermMessage("Error finding your home directory\nCan't load config files")
142 xdgHome = home + "/.config"
144 configDir = xdgHome + "/micro"
146 if _, err := os.Stat(xdgHome); os.IsNotExist(err) {
147 // If the xdgHome doesn't exist we should create it
148 err = os.Mkdir(xdgHome, os.ModePerm)
150 TermMessage("Error creating XDG_CONFIG_HOME directory: " + err.Error())
154 if _, err := os.Stat(configDir); os.IsNotExist(err) {
155 // If the micro specific config directory doesn't exist we should create that too
156 err = os.Mkdir(configDir, os.ModePerm)
158 TermMessage("Error creating configuration directory: " + err.Error())
163 // InitScreen creates and initializes the tcell screen
165 // Should we enable true color?
166 truecolor := os.Getenv("MICRO_TRUECOLOR") == "1"
168 // In order to enable true color, we have to set the TERM to `xterm-truecolor` when
169 // initializing tcell, but after that, we can set the TERM back to whatever it was
170 oldTerm := os.Getenv("TERM")
172 os.Setenv("TERM", "xterm-truecolor")
177 screen, err = tcell.NewScreen()
182 if err = screen.Init(); err != nil {
187 // Now we can put the TERM back to what it was before
189 os.Setenv("TERM", oldTerm)
192 screen.SetStyle(defStyle)
196 // RedrawAll redraws everything -- all the views and the messenger
199 for _, v := range tabs[curTab].views {
208 // Find the user's configuration directory (probably $XDG_CONFIG_HOME/micro)
211 // Build a list of available Extensions (Syntax, Colorscheme etc.)
214 // Load the user's settings
222 for _, tab := range tabs {
223 for _, v := range tab.views {
225 if v.Buf.Settings["syntax"].(bool) {
232 // Passing -version as a flag will have micro print out the version number
233 var flagVersion = flag.Bool("version", false, "Show the version number and information")
234 var flagStartPos = flag.String("startpos", "", "LINE,COL to start the cursor at when opening a buffer.")
237 flag.Usage = func() {
238 fmt.Println("Usage: micro [OPTIONS] [FILE]...")
239 fmt.Print("Micro's options can be set via command line arguments for quick adjustments. For real configuration, please use the bindings.json file (see 'help options').\n\n")
243 optionFlags := make(map[string]*string)
245 for k, v := range DefaultGlobalSettings() {
246 optionFlags[k] = flag.String(k, "", fmt.Sprintf("The %s option. Default value: '%v'", k, v))
252 // If -version was passed
253 fmt.Println("Version:", Version)
254 fmt.Println("Commit hash:", CommitHash)
255 fmt.Println("Compiled on", CompileDate)
259 // Start the Lua VM for running plugins
263 // Some encoding stuff in case the user isn't using UTF-8
265 tcell.SetEncodingFallback(tcell.EncodingFallbackASCII)
267 // Find the user's configuration directory (probably $XDG_CONFIG_HOME/micro)
270 // Build a list of available Extensions (Syntax, Colorscheme etc.)
273 // Load the user's settings
282 // This is just so if we have an error, we can exit cleanly and not completely
283 // mess up the terminal being worked in
284 // In other words we need to shut down tcell before the program crashes
286 if err := recover(); err != nil {
288 fmt.Println("Micro encountered an error:", err)
289 // Print the stack trace too
290 fmt.Print(errors.Wrap(err, 2).ErrorStack())
295 // Create a new messenger
296 // This is used for sending the user messages in the bottom of the editor
297 messenger = new(Messenger)
298 messenger.history = make(map[string][]string)
300 // Now we load the input
301 buffers := LoadInput()
302 if len(buffers) == 0 {
306 for _, buf := range buffers {
307 // For each buffer we create a new tab and place the view in that tab
308 tab := NewTabFromView(NewView(buf))
309 tab.SetNum(len(tabs))
310 tabs = append(tabs, tab)
311 for _, t := range tabs {
312 for _, v := range t.views {
320 for k, v := range optionFlags {
326 // Load all the plugin stuff
327 // We give plugins access to a bunch of variables here which could be useful to them
328 L.SetGlobal("OS", luar.New(L, runtime.GOOS))
329 L.SetGlobal("tabs", luar.New(L, tabs))
330 L.SetGlobal("curTab", luar.New(L, curTab))
331 L.SetGlobal("messenger", luar.New(L, messenger))
332 L.SetGlobal("GetOption", luar.New(L, GetOption))
333 L.SetGlobal("AddOption", luar.New(L, AddOption))
334 L.SetGlobal("SetOption", luar.New(L, SetOption))
335 L.SetGlobal("SetLocalOption", luar.New(L, SetLocalOption))
336 L.SetGlobal("BindKey", luar.New(L, BindKey))
337 L.SetGlobal("MakeCommand", luar.New(L, MakeCommand))
338 L.SetGlobal("CurView", luar.New(L, CurView))
339 L.SetGlobal("IsWordChar", luar.New(L, IsWordChar))
340 L.SetGlobal("HandleCommand", luar.New(L, HandleCommand))
341 L.SetGlobal("HandleShellCommand", luar.New(L, HandleShellCommand))
342 L.SetGlobal("GetLeadingWhitespace", luar.New(L, GetLeadingWhitespace))
343 L.SetGlobal("MakeCompletion", luar.New(L, MakeCompletion))
344 L.SetGlobal("NewBuffer", luar.New(L, NewBufferFromString))
345 L.SetGlobal("RuneStr", luar.New(L, func(r rune) string {
348 L.SetGlobal("Loc", luar.New(L, func(x, y int) Loc {
351 L.SetGlobal("JoinPaths", luar.New(L, filepath.Join))
352 L.SetGlobal("DirectoryName", luar.New(L, filepath.Dir))
353 L.SetGlobal("configDir", luar.New(L, configDir))
354 L.SetGlobal("Reload", luar.New(L, LoadAll))
355 L.SetGlobal("ByteOffset", luar.New(L, ByteOffset))
356 L.SetGlobal("ToCharPos", luar.New(L, ToCharPos))
358 // Used for asynchronous jobs
359 L.SetGlobal("JobStart", luar.New(L, JobStart))
360 L.SetGlobal("JobSpawn", luar.New(L, JobSpawn))
361 L.SetGlobal("JobSend", luar.New(L, JobSend))
362 L.SetGlobal("JobStop", luar.New(L, JobStop))
365 L.SetGlobal("ReadRuntimeFile", luar.New(L, PluginReadRuntimeFile))
366 L.SetGlobal("ListRuntimeFiles", luar.New(L, PluginListRuntimeFiles))
367 L.SetGlobal("AddRuntimeFile", luar.New(L, PluginAddRuntimeFile))
368 L.SetGlobal("AddRuntimeFilesFromDirectory", luar.New(L, PluginAddRuntimeFilesFromDirectory))
370 jobs = make(chan JobFunction, 100)
371 events = make(chan tcell.Event, 100)
372 autosave = make(chan bool)
376 // Load the syntax files, including the colorscheme
379 for _, t := range tabs {
380 for _, v := range t.views {
383 for _, pl := range loadedPlugins {
384 _, err := Call(pl+".onViewOpen", v)
385 if err != nil && !strings.HasPrefix(err.Error(), "function does not exist") {
390 if v.Buf.Settings["syntax"].(bool) {
396 // Here is the event loop which runs in a separate thread
399 events <- screen.PollEvent()
405 time.Sleep(autosaveTime * time.Second)
406 if globalSettings["autosave"].(bool) {
413 // Display everything
416 var event tcell.Event
418 // Check for new events
421 // If a new job has finished while running in the background we should execute the callback
422 f.function(f.output, f.args...)
426 case event = <-events:
430 switch e := event.(type) {
431 case *tcell.EventMouse:
432 if e.Buttons() == tcell.Button1 {
433 // If the user left clicked we check a couple things
434 _, h := screen.Size()
436 if y == h-1 && messenger.message != "" && globalSettings["infobar"].(bool) {
437 // If the user clicked in the bottom bar, and there is a message down there
438 // we copy it to the clipboard.
439 // Often error messages are displayed down there so it can be useful to easily
441 clipboard.WriteAll(messenger.message, "primary")
445 if CurView().mouseReleased {
446 // We loop through each view in the current tab and make sure the current view
447 // is the one being clicked in
448 for _, v := range tabs[curTab].views {
449 if x >= v.x && x < v.x+v.Width && y >= v.y && y < v.y+v.Height {
450 tabs[curTab].CurView = v.Num
457 // This function checks the mouse event for the possibility of changing the current tab
458 // If the tab was changed it returns true
459 if TabbarHandleMouseEvent(event) {
464 // Since searching is done in real time, we need to redraw every time
465 // there is a new event in the search bar so we need a special function
466 // to run instead of the standard HandleEvent.
467 HandleSearchEvent(event, CurView())
469 // Send it to the view
470 CurView().HandleEvent(event)
474 case event = <-events: