209 lines
5 KiB
Go
209 lines
5 KiB
Go
package buffer
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import (
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"bytes"
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"errors"
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"io"
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"os"
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"os/exec"
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"os/signal"
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"path/filepath"
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"unicode"
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"unicode/utf8"
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"github.com/zyedidia/micro/internal/config"
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. "github.com/zyedidia/micro/internal/util"
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"golang.org/x/text/encoding"
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"golang.org/x/text/encoding/htmlindex"
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"golang.org/x/text/transform"
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)
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// LargeFileThreshold is the number of bytes when fastdirty is forced
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// because hashing is too slow
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const LargeFileThreshold = 50000
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// overwriteFile opens the given file for writing, truncating if one exists, and then calls
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// the supplied function with the file as io.Writer object, also making sure the file is
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// closed afterwards.
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func overwriteFile(name string, enc encoding.Encoding, fn func(io.Writer) error) (err error) {
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var file *os.File
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if file, err = os.OpenFile(name, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644); err != nil {
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return
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}
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defer func() {
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if e := file.Close(); e != nil && err == nil {
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err = e
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}
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}()
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w := transform.NewWriter(file, enc.NewEncoder())
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// w := bufio.NewWriter(file)
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if err = fn(w); err != nil {
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return
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}
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// err = w.Flush()
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return
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}
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// Save saves the buffer to its default path
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func (b *Buffer) Save() error {
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return b.SaveAs(b.Path)
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}
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// SaveAs saves the buffer to a specified path (filename), creating the file if it does not exist
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func (b *Buffer) SaveAs(filename string) (err error) {
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if b.Type.Scratch {
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return errors.New("Cannot save scratch buffer")
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}
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b.UpdateRules()
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if b.Settings["rmtrailingws"].(bool) {
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for i, l := range b.lines {
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leftover := utf8.RuneCount(bytes.TrimRightFunc(l.data, unicode.IsSpace))
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linelen := utf8.RuneCount(l.data)
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b.Remove(Loc{leftover, i}, Loc{linelen, i})
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}
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b.RelocateCursors()
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}
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if b.Settings["eofnewline"].(bool) {
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end := b.End()
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if b.RuneAt(Loc{end.X - 1, end.Y}) != '\n' {
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b.Insert(end, "\n")
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}
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}
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// Update the last time this file was updated after saving
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defer func() {
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b.ModTime, _ = GetModTime(filename)
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err = b.Serialize()
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}()
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// Removes any tilde and replaces with the absolute path to home
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absFilename, _ := ReplaceHome(filename)
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// TODO: save creates parent dirs
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// // Get the leading path to the file | "." is returned if there's no leading path provided
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// if dirname := filepath.Dir(absFilename); dirname != "." {
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// // Check if the parent dirs don't exist
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// if _, statErr := os.Stat(dirname); os.IsNotExist(statErr) {
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// // Prompt to make sure they want to create the dirs that are missing
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// if yes, canceled := messenger.YesNoPrompt("Parent folders \"" + dirname + "\" do not exist. Create them? (y,n)"); yes && !canceled {
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// // Create all leading dir(s) since they don't exist
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// if mkdirallErr := os.MkdirAll(dirname, os.ModePerm); mkdirallErr != nil {
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// // If there was an error creating the dirs
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// return mkdirallErr
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// }
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// } else {
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// // If they canceled the creation of leading dirs
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// return errors.New("Save aborted")
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// }
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// }
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// }
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var fileSize int
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enc, err := htmlindex.Get(b.Settings["encoding"].(string))
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if err != nil {
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return err
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}
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err = overwriteFile(absFilename, enc, func(file io.Writer) (e error) {
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if len(b.lines) == 0 {
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return
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}
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// end of line
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var eol []byte
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if b.Endings == FFDos {
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eol = []byte{'\r', '\n'}
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} else {
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eol = []byte{'\n'}
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}
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// write lines
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if fileSize, e = file.Write(b.lines[0].data); e != nil {
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return
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}
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for _, l := range b.lines[1:] {
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if _, e = file.Write(eol); e != nil {
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return
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}
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if _, e = file.Write(l.data); e != nil {
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return
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}
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fileSize += len(eol) + len(l.data)
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}
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return
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})
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if err != nil {
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return err
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}
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if !b.Settings["fastdirty"].(bool) {
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if fileSize > LargeFileThreshold {
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// For large files 'fastdirty' needs to be on
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b.Settings["fastdirty"] = true
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} else {
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calcHash(b, &b.origHash)
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}
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}
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b.Path = filename
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absPath, _ := filepath.Abs(filename)
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b.AbsPath = absPath
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b.isModified = false
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return
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}
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// SaveWithSudo saves the buffer to the default path with sudo
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func (b *Buffer) SaveWithSudo() error {
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return b.SaveAsWithSudo(b.Path)
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}
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// SaveAsWithSudo is the same as SaveAs except it uses a neat trick
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// with tee to use sudo so the user doesn't have to reopen micro with sudo
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func (b *Buffer) SaveAsWithSudo(filename string) error {
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if b.Type.Scratch {
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return errors.New("Cannot save scratch buffer")
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}
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b.UpdateRules()
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b.Path = filename
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absPath, _ := filepath.Abs(filename)
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b.AbsPath = absPath
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// Set up everything for the command
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cmd := exec.Command(config.GlobalSettings["sucmd"].(string), "tee", filename)
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cmd.Stdin = bytes.NewBuffer(b.Bytes())
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// This is a trap for Ctrl-C so that it doesn't kill micro
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// Instead we trap Ctrl-C to kill the program we're running
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c := make(chan os.Signal, 1)
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signal.Notify(c, os.Interrupt)
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go func() {
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for range c {
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cmd.Process.Kill()
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}
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}()
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// Start the command
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cmd.Start()
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err := cmd.Wait()
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if err == nil {
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b.isModified = false
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b.ModTime, _ = GetModTime(filename)
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return b.Serialize()
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}
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return err
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}
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