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buffer.go
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buffer.go
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package main
import (
"bufio"
"bytes"
"crypto/md5"
"encoding/gob"
"errors"
"io"
"io/ioutil"
"os"
"os/exec"
"os/signal"
"path/filepath"
"strconv"
"strings"
"time"
"unicode"
"unicode/utf8"
"github.com/Pestdoktor/micro/cmd/micro/highlight"
)
const LargeFileThreshold = 50000
var (
// 0 - no line type detected
// 1 - lf detected
// 2 - crlf detected
fileformat = 0
)
// Buffer stores the text for files that are loaded into the text editor
// It uses a rope to efficiently store the string and contains some
// simple functions for saving and wrapper functions for modifying the rope
type Buffer struct {
// The eventhandler for undo/redo
*EventHandler
// This stores all the text in the buffer as an array of lines
*LineArray
Cursor Cursor
cursors []*Cursor // for multiple cursors
curCursor int // the current cursor
// Path to the file on disk
Path string
// Absolute path to the file on disk
AbsPath string
// Name of the buffer on the status line
name string
// Whether or not the buffer has been modified since it was opened
IsModified bool
// Stores the last modification time of the file the buffer is pointing to
ModTime time.Time
// NumLines is the number of lines in the buffer
NumLines int
syntaxDef *highlight.Def
highlighter *highlight.Highlighter
// Hash of the original buffer -- empty if fastdirty is on
origHash [md5.Size]byte
// Buffer local settings
Settings map[string]interface{}
}
// The SerializedBuffer holds the types that get serialized when a buffer is saved
// These are used for the savecursor and saveundo options
type SerializedBuffer struct {
EventHandler *EventHandler
Cursor Cursor
ModTime time.Time
}
// NewBufferFromFile opens a new buffer using the given path
// It will also automatically handle `~`, and line/column with filename:l:c
// It will return an empty buffer if the path does not exist
// and an error if the file is a directory
func NewBufferFromFile(path string) (*Buffer, error) {
filename, cursorPosition := GetPathAndCursorPosition(path)
filename = ReplaceHome(filename)
file, err := os.Open(filename)
fileInfo, _ := os.Stat(filename)
if err == nil && fileInfo.IsDir() {
return nil, errors.New(filename + " is a directory")
}
defer file.Close()
var buf *Buffer
if err != nil {
// File does not exist -- create an empty buffer with that name
buf = NewBufferFromString("", filename)
} else {
buf = NewBuffer(file, FSize(file), filename, cursorPosition)
}
return buf, nil
}
// NewBufferFromString creates a new buffer containing the given string
func NewBufferFromString(text, path string) *Buffer {
return NewBuffer(strings.NewReader(text), int64(len(text)), path, nil)
}
// NewBuffer creates a new buffer from a given reader with a given path
func NewBuffer(reader io.Reader, size int64, path string, cursorPosition []string) *Buffer {
// check if the file is already open in a tab. If it's open return the buffer to that tab
if path != "" {
for _, tab := range tabs {
for _, view := range tab.Views {
if view.Buf.Path == path {
return view.Buf
}
}
}
}
b := new(Buffer)
b.LineArray = NewLineArray(size, reader)
b.Settings = DefaultLocalSettings()
for k, v := range globalSettings {
if _, ok := b.Settings[k]; ok {
b.Settings[k] = v
}
}
if fileformat == 1 {
b.Settings["fileformat"] = "unix"
} else if fileformat == 2 {
b.Settings["fileformat"] = "dos"
}
absPath, _ := filepath.Abs(path)
b.Path = path
b.AbsPath = absPath
// The last time this file was modified
b.ModTime, _ = GetModTime(b.Path)
b.EventHandler = NewEventHandler(b)
b.Update()
b.UpdateRules()
if _, err := os.Stat(configDir + "/buffers/"); os.IsNotExist(err) {
os.Mkdir(configDir+"/buffers/", os.ModePerm)
}
cursorLocation, cursorLocationError := GetBufferCursorLocation(cursorPosition, b)
b.Cursor = Cursor{
Loc: cursorLocation,
buf: b,
}
InitLocalSettings(b)
if cursorLocationError != nil && len(*flagStartPos) == 0 && (b.Settings["savecursor"].(bool) || b.Settings["saveundo"].(bool)) {
// If either savecursor or saveundo is turned on, we need to load the serialized information
// from ~/.config/micro/buffers
file, err := os.Open(configDir + "/buffers/" + EscapePath(b.AbsPath))
defer file.Close()
if err == nil {
var buffer SerializedBuffer
decoder := gob.NewDecoder(file)
gob.Register(TextEvent{})
err = decoder.Decode(&buffer)
if err != nil {
TermMessage(err.Error(), "\n", "You may want to remove the files in ~/.config/micro/buffers (these files store the information for the 'saveundo' and 'savecursor' options) if this problem persists.")
}
if b.Settings["savecursor"].(bool) {
b.Cursor = buffer.Cursor
b.Cursor.buf = b
b.Cursor.Relocate()
}
if b.Settings["saveundo"].(bool) {
// We should only use last time's eventhandler if the file wasn't modified by someone else in the meantime
if b.ModTime == buffer.ModTime {
b.EventHandler = buffer.EventHandler
b.EventHandler.buf = b
}
}
}
}
if !b.Settings["fastdirty"].(bool) {
if size > LargeFileThreshold {
// If the file is larger than a megabyte fastdirty needs to be on
b.Settings["fastdirty"] = true
} else {
calcHash(b, &b.origHash)
}
}
b.cursors = []*Cursor{&b.Cursor}
return b
}
func GetBufferCursorLocation(cursorPosition []string, b *Buffer) (Loc, error) {
// parse the cursor position. The cursor location is ALWAYS initialised to 0, 0 even when
// an error occurs due to lack of arguments or because the arguments are not numbers
cursorLocation, cursorLocationError := ParseCursorLocation(cursorPosition)
// Put the cursor at the first spot. In the logic for cursor position the -startpos
// flag is processed first and will overwrite any line/col parameters with colons after the filename
if len(*flagStartPos) > 0 || cursorLocationError == nil {
var lineNum, colNum int
var errPos1, errPos2 error
positions := strings.Split(*flagStartPos, ",")
// if the -startpos flag contains enough args use them for the cursor location.
// In this case args passed at the end of the filename will be ignored
if len(positions) == 2 {
lineNum, errPos1 = strconv.Atoi(positions[0])
colNum, errPos2 = strconv.Atoi(positions[1])
}
// if -startpos has invalid arguments, use the arguments from filename.
// This will have a default value (0, 0) even when the filename arguments are invalid
if errPos1 != nil || errPos2 != nil || len(*flagStartPos) == 0 {
// otherwise check if there are any arguments after the filename and use them
lineNum = cursorLocation.Y
colNum = cursorLocation.X
}
// if some arguments were found make sure they don't go outside the file and cause overflows
cursorLocation.Y = lineNum - 1
cursorLocation.X = colNum
// Check to avoid line overflow
if cursorLocation.Y > b.NumLines-1 {
cursorLocation.Y = b.NumLines - 1
} else if cursorLocation.Y < 0 {
cursorLocation.Y = 0
}
// Check to avoid column overflow
if cursorLocation.X > len(b.Line(cursorLocation.Y)) {
cursorLocation.X = len(b.Line(cursorLocation.Y))
} else if cursorLocation.X < 0 {
cursorLocation.X = 0
}
}
return cursorLocation, cursorLocationError
}
// GetName returns the name that should be displayed in the statusline
// for this buffer
func (b *Buffer) GetName() string {
if b.name == "" {
if b.Path == "" {
return "No name"
}
return b.Path
}
return b.name
}
// UpdateRules updates the syntax rules and filetype for this buffer
// This is called when the colorscheme changes
func (b *Buffer) UpdateRules() {
rehighlight := false
var files []*highlight.File
for _, f := range ListRuntimeFiles(RTSyntax) {
data, err := f.Data()
if err != nil {
TermMessage("Error loading syntax file " + f.Name() + ": " + err.Error())
} else {
file, err := highlight.ParseFile(data)
if err != nil {
TermMessage("Error loading syntax file " + f.Name() + ": " + err.Error())
continue
}
ftdetect, err := highlight.ParseFtDetect(file)
if err != nil {
TermMessage("Error loading syntax file " + f.Name() + ": " + err.Error())
continue
}
ft := b.Settings["filetype"].(string)
if (ft == "Unknown" || ft == "") && !rehighlight {
if highlight.MatchFiletype(ftdetect, b.Path, b.lines[0].data) {
header := new(highlight.Header)
header.FileType = file.FileType
header.FtDetect = ftdetect
b.syntaxDef, err = highlight.ParseDef(file, header)
if err != nil {
TermMessage("Error loading syntax file " + f.Name() + ": " + err.Error())
continue
}
rehighlight = true
}
} else {
if file.FileType == ft && !rehighlight {
header := new(highlight.Header)
header.FileType = file.FileType
header.FtDetect = ftdetect
b.syntaxDef, err = highlight.ParseDef(file, header)
if err != nil {
TermMessage("Error loading syntax file " + f.Name() + ": " + err.Error())
continue
}
rehighlight = true
}
}
files = append(files, file)
}
}
if b.syntaxDef != nil {
highlight.ResolveIncludes(b.syntaxDef, files)
}
if b.highlighter == nil || rehighlight {
if b.syntaxDef != nil {
b.Settings["filetype"] = b.syntaxDef.FileType
b.highlighter = highlight.NewHighlighter(b.syntaxDef)
if b.Settings["syntax"].(bool) {
b.highlighter.HighlightStates(b)
}
}
}
}
// FileType returns the buffer's filetype
func (b *Buffer) FileType() string {
return b.Settings["filetype"].(string)
}
// IndentString returns a string representing one level of indentation
func (b *Buffer) IndentString() string {
if b.Settings["tabstospaces"].(bool) {
return Spaces(int(b.Settings["tabsize"].(float64)))
}
return "\t"
}
// CheckModTime makes sure that the file this buffer points to hasn't been updated
// by an external program since it was last read
// If it has, we ask the user if they would like to reload the file
func (b *Buffer) CheckModTime() {
modTime, ok := GetModTime(b.Path)
if ok {
if modTime != b.ModTime {
choice, canceled := messenger.YesNoPrompt("The file has changed since it was last read. Reload file? (y,n)")
messenger.Reset()
messenger.Clear()
if !choice || canceled {
// Don't load new changes -- do nothing
b.ModTime, _ = GetModTime(b.Path)
} else {
// Load new changes
b.ReOpen()
}
}
}
}
// ReOpen reloads the current buffer from disk
func (b *Buffer) ReOpen() {
data, err := ioutil.ReadFile(b.Path)
txt := string(data)
if err != nil {
messenger.Error(err.Error())
return
}
b.EventHandler.ApplyDiff(txt)
b.ModTime, _ = GetModTime(b.Path)
b.IsModified = false
b.Update()
b.Cursor.Relocate()
}
// Update fetches the string from the rope and updates the `text` and `lines` in the buffer
func (b *Buffer) Update() {
b.NumLines = len(b.lines)
}
// MergeCursors merges any cursors that are at the same position
// into one cursor
func (b *Buffer) MergeCursors() {
var cursors []*Cursor
for i := 0; i < len(b.cursors); i++ {
c1 := b.cursors[i]
if c1 != nil {
for j := 0; j < len(b.cursors); j++ {
c2 := b.cursors[j]
if c2 != nil && i != j && c1.Loc == c2.Loc {
b.cursors[j] = nil
}
}
cursors = append(cursors, c1)
}
}
b.cursors = cursors
for i := range b.cursors {
b.cursors[i].Num = i
}
if b.curCursor >= len(b.cursors) {
b.curCursor = len(b.cursors) - 1
}
}
// UpdateCursors updates all the cursors indicies
func (b *Buffer) UpdateCursors() {
for i, c := range b.cursors {
c.Num = i
}
}
// Save saves the buffer to its default path
func (b *Buffer) Save() error {
return b.SaveAs(b.Path)
}
// SaveWithSudo saves the buffer to the default path with sudo
func (b *Buffer) SaveWithSudo() error {
return b.SaveAsWithSudo(b.Path)
}
// Serialize serializes the buffer to configDir/buffers
func (b *Buffer) Serialize() error {
if !b.Settings["savecursor"].(bool) && !b.Settings["saveundo"].(bool) {
return nil
}
name := configDir + "/buffers/" + EscapePath(b.AbsPath)
return overwriteFile(name, func(file io.Writer) error {
return gob.NewEncoder(file).Encode(SerializedBuffer{
b.EventHandler,
b.Cursor,
b.ModTime,
})
})
}
func init() {
gob.Register(TextEvent{})
gob.Register(SerializedBuffer{})
}
// SaveAs saves the buffer to a specified path (filename), creating the file if it does not exist
func (b *Buffer) SaveAs(filename string) error {
b.UpdateRules()
if b.Settings["rmtrailingws"].(bool) {
for i, l := range b.lines {
pos := len(bytes.TrimRightFunc(l.data, unicode.IsSpace))
if pos < len(l.data) {
b.deleteToEnd(Loc{pos, i})
}
}
b.Cursor.Relocate()
}
if b.Settings["eofnewline"].(bool) {
end := b.End()
if b.RuneAt(Loc{end.X - 1, end.Y}) != '\n' {
b.Insert(end, "\n")
}
}
defer func() {
b.ModTime, _ = GetModTime(filename)
}()
// Removes any tilde and replaces with the absolute path to home
absFilename := ReplaceHome(filename)
// Get the leading path to the file | "." is returned if there's no leading path provided
if dirname := filepath.Dir(absFilename); dirname != "." {
// Check if the parent dirs don't exist
if _, statErr := os.Stat(dirname); os.IsNotExist(statErr) {
// Prompt to make sure they want to create the dirs that are missing
if yes, canceled := messenger.YesNoPrompt("Parent folders \"" + dirname + "\" do not exist. Create them? (y,n)"); yes && !canceled {
// Create all leading dir(s) since they don't exist
if mkdirallErr := os.MkdirAll(dirname, os.ModePerm); mkdirallErr != nil {
// If there was an error creating the dirs
return mkdirallErr
}
} else {
// If they canceled the creation of leading dirs
return errors.New("Save aborted")
}
}
}
var fileSize int
err := overwriteFile(absFilename, func(file io.Writer) (e error) {
if len(b.lines) == 0 {
return
}
// end of line
var eol []byte
if b.Settings["fileformat"] == "dos" {
eol = []byte{'\r', '\n'}
} else {
eol = []byte{'\n'}
}
// write lines
if fileSize, e = file.Write(b.lines[0].data); e != nil {
return
}
for _, l := range b.lines[1:] {
if _, e = file.Write(eol); e != nil {
return
}
if _, e = file.Write(l.data); e != nil {
return
}
fileSize += len(eol) + len(l.data)
}
return
})
if err != nil {
return err
}
if !b.Settings["fastdirty"].(bool) {
if fileSize > LargeFileThreshold {
// For large files 'fastdirty' needs to be on
b.Settings["fastdirty"] = true
} else {
calcHash(b, &b.origHash)
}
}
b.Path = filename
b.IsModified = false
return b.Serialize()
}
// overwriteFile opens the given file for writing, truncating if one exists, and then calls
// the supplied function with the file as io.Writer object, also making sure the file is
// closed afterwards.
func overwriteFile(name string, fn func(io.Writer) error) (err error) {
var file *os.File
if file, err = os.OpenFile(name, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644); err != nil {
return
}
defer func() {
if e := file.Close(); e != nil && err == nil {
err = e
}
}()
w := bufio.NewWriter(file)
if err = fn(w); err != nil {
return
}
err = w.Flush()
return
}
// calcHash calculates md5 hash of all lines in the buffer
func calcHash(b *Buffer, out *[md5.Size]byte) {
h := md5.New()
if len(b.lines) > 0 {
h.Write(b.lines[0].data)
for _, l := range b.lines[1:] {
h.Write([]byte{'\n'})
h.Write(l.data)
}
}
h.Sum((*out)[:0])
}
// SaveAsWithSudo is the same as SaveAs except it uses a neat trick
// with tee to use sudo so the user doesn't have to reopen micro with sudo
func (b *Buffer) SaveAsWithSudo(filename string) error {
b.UpdateRules()
b.Path = filename
// Shut down the screen because we're going to interact directly with the shell
screen.Fini()
screen = nil
// Set up everything for the command
cmd := exec.Command(globalSettings["sucmd"].(string), "tee", filename)
cmd.Stdin = bytes.NewBufferString(b.SaveString(b.Settings["fileformat"] == "dos"))
// This is a trap for Ctrl-C so that it doesn't kill micro
// Instead we trap Ctrl-C to kill the program we're running
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
go func() {
for range c {
cmd.Process.Kill()
}
}()
// Start the command
cmd.Start()
err := cmd.Wait()
// Start the screen back up
InitScreen()
if err == nil {
b.IsModified = false
b.ModTime, _ = GetModTime(filename)
b.Serialize()
}
return err
}
// Modified returns if this buffer has been modified since
// being opened
func (b *Buffer) Modified() bool {
if b.Settings["fastdirty"].(bool) {
return b.IsModified
}
var buff [md5.Size]byte
calcHash(b, &buff)
return buff != b.origHash
}
func (b *Buffer) insert(pos Loc, value []byte) {
b.IsModified = true
b.LineArray.insert(pos, value)
b.Update()
}
func (b *Buffer) remove(start, end Loc) string {
b.IsModified = true
sub := b.LineArray.remove(start, end)
b.Update()
return sub
}
func (b *Buffer) deleteToEnd(start Loc) {
b.IsModified = true
b.LineArray.DeleteToEnd(start)
b.Update()
}
// Start returns the location of the first character in the buffer
func (b *Buffer) Start() Loc {
return Loc{0, 0}
}
// End returns the location of the last character in the buffer
func (b *Buffer) End() Loc {
return Loc{utf8.RuneCount(b.lines[b.NumLines-1].data), b.NumLines - 1}
}
// RuneAt returns the rune at a given location in the buffer
func (b *Buffer) RuneAt(loc Loc) rune {
line := b.LineRunes(loc.Y)
if len(line) > 0 {
return line[loc.X]
}
return '\n'
}
// LineBytes returns a single line as an array of runes
func (b *Buffer) LineBytes(n int) []byte {
if n >= len(b.lines) {
return []byte{}
}
return b.lines[n].data
}
// LineRunes returns a single line as an array of runes
func (b *Buffer) LineRunes(n int) []rune {
if n >= len(b.lines) {
return []rune{}
}
return toRunes(b.lines[n].data)
}
// Line returns a single line
func (b *Buffer) Line(n int) string {
if n >= len(b.lines) {
return ""
}
return string(b.lines[n].data)
}
// LinesNum returns the number of lines in the buffer
func (b *Buffer) LinesNum() int {
return len(b.lines)
}
// Lines returns an array of strings containing the lines from start to end
func (b *Buffer) Lines(start, end int) []string {
lines := b.lines[start:end]
var slice []string
for _, line := range lines {
slice = append(slice, string(line.data))
}
return slice
}
// Len gives the length of the buffer
func (b *Buffer) Len() (n int) {
for _, l := range b.lines {
n += utf8.RuneCount(l.data)
}
if len(b.lines) > 1 {
n += len(b.lines) - 1 // account for newlines
}
return
}
// MoveLinesUp moves the range of lines up one row
func (b *Buffer) MoveLinesUp(start int, end int) {
// 0 < start < end <= len(b.lines)
if start < 1 || start >= end || end > len(b.lines) {
return // what to do? FIXME
}
if end == len(b.lines) {
b.Insert(
Loc{
utf8.RuneCount(b.lines[end-1].data),
end - 1,
},
"\n"+b.Line(start-1),
)
} else {
b.Insert(
Loc{0, end},
b.Line(start-1)+"\n",
)
}
b.Remove(
Loc{0, start - 1},
Loc{0, start},
)
}
// MoveLinesDown moves the range of lines down one row
func (b *Buffer) MoveLinesDown(start int, end int) {
// 0 <= start < end < len(b.lines)
// if end == len(b.lines), we can't do anything here because the
// last line is unaccessible, FIXME
if start < 0 || start >= end || end >= len(b.lines)-1 {
return // what to do? FIXME
}
b.Insert(
Loc{0, start},
b.Line(end)+"\n",
)
end++
b.Remove(
Loc{0, end},
Loc{0, end + 1},
)
}
// ClearMatches clears all of the syntax highlighting for this buffer
func (b *Buffer) ClearMatches() {
for i := range b.lines {
b.SetMatch(i, nil)
b.SetState(i, nil)
}
}
func (b *Buffer) clearCursors() {
for i := 1; i < len(b.cursors); i++ {
b.cursors[i] = nil
}
b.cursors = b.cursors[:1]
b.UpdateCursors()
b.Cursor.ResetSelection()
}
var bracePairs = [][2]rune{
{'(', ')'},
{'{', '}'},
{'[', ']'},
}
// FindMatchingBrace returns the location in the buffer of the matching bracket
// It is given a brace type containing the open and closing character, (for example
// '{' and '}') as well as the location to match from
func (b *Buffer) FindMatchingBrace(braceType [2]rune, start Loc) Loc {
curLine := b.LineRunes(start.Y)
startChar := curLine[start.X]
var i int
if startChar == braceType[0] {
for y := start.Y; y < b.NumLines; y++ {
l := b.LineRunes(y)
xInit := 0
if y == start.Y {
xInit = start.X
}
for x := xInit; x < len(l); x++ {
r := l[x]
if r == braceType[0] {
i++
} else if r == braceType[1] {
i--
if i == 0 {
return Loc{x, y}
}
}
}
}
} else if startChar == braceType[1] {
for y := start.Y; y >= 0; y-- {
l := []rune(string(b.lines[y].data))
xInit := len(l) - 1
if y == start.Y {
xInit = start.X
}
for x := xInit; x >= 0; x-- {
r := l[x]
if r == braceType[0] {
i--
if i == 0 {
return Loc{x, y}
}
} else if r == braceType[1] {
i++
}
}
}
}
return start
}