mirror of
https://github.com/zyedidia/micro.git
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Change project layout and use go.mod
This commit is contained in:
Zachary Yedidia
695
internal/buffer/buffer.go
Normal file
695
internal/buffer/buffer.go
Normal file
@@ -0,0 +1,695 @@
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package buffer
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import (
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"bytes"
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"crypto/md5"
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"errors"
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"io"
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"io/ioutil"
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"os"
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"path/filepath"
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"strings"
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"time"
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"unicode/utf8"
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"github.com/zyedidia/micro/internal/config"
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"github.com/zyedidia/micro/pkg/highlight"
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"github.com/zyedidia/micro/internal/screen"
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. "github.com/zyedidia/micro/internal/util"
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"golang.org/x/text/encoding/htmlindex"
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"golang.org/x/text/encoding/unicode"
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"golang.org/x/text/transform"
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)
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var (
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OpenBuffers []*Buffer
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)
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// The BufType defines what kind of buffer this is
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type BufType struct {
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Kind int
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Readonly bool // The buffer cannot be edited
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Scratch bool // The buffer cannot be saved
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Syntax bool // Syntax highlighting is enabled
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}
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var (
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BTDefault = BufType{0, false, false, true}
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BTHelp = BufType{1, true, true, true}
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BTLog = BufType{2, true, true, false}
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BTScratch = BufType{3, false, true, false}
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BTRaw = BufType{4, false, true, false}
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BTInfo = BufType{5, false, true, false}
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ErrFileTooLarge = errors.New("File is too large to hash")
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)
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type SharedBuffer struct {
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*LineArray
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// Stores the last modification time of the file the buffer is pointing to
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ModTime time.Time
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// Type of the buffer (e.g. help, raw, scratch etc..)
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Type BufType
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isModified bool
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// Whether or not suggestions can be autocompleted must be shared because
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// it changes based on how the buffer has changed
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HasSuggestions bool
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}
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func (b *SharedBuffer) insert(pos Loc, value []byte) {
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b.isModified = true
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b.HasSuggestions = false
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b.LineArray.insert(pos, value)
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}
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func (b *SharedBuffer) remove(start, end Loc) []byte {
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b.isModified = true
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b.HasSuggestions = false
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return b.LineArray.remove(start, end)
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}
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// Buffer stores the main information about a currently open file including
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// the actual text (in a LineArray), the undo/redo stack (in an EventHandler)
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// all the cursors, the syntax highlighting info, the settings for the buffer
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// and some misc info about modification time and path location.
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// The syntax highlighting info must be stored with the buffer because the syntax
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// highlighter attaches information to each line of the buffer for optimization
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// purposes so it doesn't have to rehighlight everything on every update.
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type Buffer struct {
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*EventHandler
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*SharedBuffer
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cursors []*Cursor
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curCursor int
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StartCursor Loc
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// Path to the file on disk
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Path string
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// Absolute path to the file on disk
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AbsPath string
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// Name of the buffer on the status line
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name string
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SyntaxDef *highlight.Def
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Highlighter *highlight.Highlighter
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// Hash of the original buffer -- empty if fastdirty is on
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origHash [md5.Size]byte
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// Settings customized by the user
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Settings map[string]interface{}
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Suggestions []string
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Completions []string
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CurSuggestion int
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Messages []*Message
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}
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// NewBufferFromFile opens a new buffer using the given path
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// It will also automatically handle `~`, and line/column with filename:l:c
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// It will return an empty buffer if the path does not exist
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// and an error if the file is a directory
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func NewBufferFromFile(path string, btype BufType) (*Buffer, error) {
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var err error
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filename, cursorPosition := GetPathAndCursorPosition(path)
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filename, err = ReplaceHome(filename)
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if err != nil {
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return nil, err
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}
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file, err := os.Open(filename)
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fileInfo, _ := os.Stat(filename)
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if err == nil && fileInfo.IsDir() {
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return nil, errors.New(filename + " is a directory")
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}
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defer file.Close()
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var buf *Buffer
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if err != nil {
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// File does not exist -- create an empty buffer with that name
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buf = NewBufferFromString("", filename, btype)
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} else {
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buf = NewBuffer(file, FSize(file), filename, cursorPosition, btype)
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}
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return buf, nil
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}
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// NewBufferFromString creates a new buffer containing the given string
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func NewBufferFromString(text, path string, btype BufType) *Buffer {
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return NewBuffer(strings.NewReader(text), int64(len(text)), path, nil, btype)
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}
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// NewBuffer creates a new buffer from a given reader with a given path
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// Ensure that ReadSettings and InitGlobalSettings have been called before creating
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// a new buffer
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func NewBuffer(r io.Reader, size int64, path string, cursorPosition []string, btype BufType) *Buffer {
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absPath, _ := filepath.Abs(path)
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b := new(Buffer)
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b.Settings = config.DefaultLocalSettings()
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for k, v := range config.GlobalSettings {
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if _, ok := b.Settings[k]; ok {
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b.Settings[k] = v
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}
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}
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config.InitLocalSettings(b.Settings, b.Path)
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enc, err := htmlindex.Get(b.Settings["encoding"].(string))
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if err != nil {
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enc = unicode.UTF8
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b.Settings["encoding"] = "utf-8"
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}
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reader := transform.NewReader(r, enc.NewDecoder())
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found := false
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if len(path) > 0 {
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for _, buf := range OpenBuffers {
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if buf.AbsPath == absPath {
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found = true
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b.SharedBuffer = buf.SharedBuffer
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b.EventHandler = buf.EventHandler
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}
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}
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}
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if !found {
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b.SharedBuffer = new(SharedBuffer)
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b.Type = btype
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b.LineArray = NewLineArray(uint64(size), FFAuto, reader)
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b.EventHandler = NewEventHandler(b.SharedBuffer, b.cursors)
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}
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switch b.Endings {
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case FFUnix:
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b.Settings["fileformat"] = "unix"
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case FFDos:
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b.Settings["fileformat"] = "dos"
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}
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b.Path = path
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b.AbsPath = absPath
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// The last time this file was modified
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b.ModTime, _ = GetModTime(b.Path)
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b.UpdateRules()
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if _, err := os.Stat(config.ConfigDir + "/buffers/"); os.IsNotExist(err) {
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os.Mkdir(config.ConfigDir+"/buffers/", os.ModePerm)
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}
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// cursorLocation, err := GetBufferCursorLocation(cursorPosition, b)
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// b.startcursor = Cursor{
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// Loc: cursorLocation,
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// buf: b,
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// }
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// TODO flagstartpos
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if b.Settings["savecursor"].(bool) || b.Settings["saveundo"].(bool) {
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err := b.Unserialize()
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if err != nil {
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screen.TermMessage(err)
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}
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}
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b.AddCursor(NewCursor(b, b.StartCursor))
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if !b.Settings["fastdirty"].(bool) {
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if size > LargeFileThreshold {
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// If the file is larger than LargeFileThreshold 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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OpenBuffers = append(OpenBuffers, b)
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return b
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}
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// Close removes this buffer from the list of open buffers
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func (b *Buffer) Close() {
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for i, buf := range OpenBuffers {
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if b == buf {
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copy(OpenBuffers[i:], OpenBuffers[i+1:])
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OpenBuffers[len(OpenBuffers)-1] = nil
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OpenBuffers = OpenBuffers[:len(OpenBuffers)-1]
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return
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}
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}
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}
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// GetName returns the name that should be displayed in the statusline
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// for this buffer
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func (b *Buffer) GetName() string {
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if b.name == "" {
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if b.Path == "" {
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return "No name"
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}
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return b.Path
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}
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return b.name
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}
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//SetName changes the name for this buffer
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func (b *Buffer) SetName(s string) {
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b.name = s
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}
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func (b *Buffer) Insert(start Loc, text string) {
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if !b.Type.Readonly {
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b.EventHandler.cursors = b.cursors
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b.EventHandler.active = b.curCursor
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b.EventHandler.Insert(start, text)
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}
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}
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func (b *Buffer) Remove(start, end Loc) {
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if !b.Type.Readonly {
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b.EventHandler.cursors = b.cursors
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b.EventHandler.active = b.curCursor
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b.EventHandler.Remove(start, end)
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}
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}
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// FileType returns the buffer's filetype
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func (b *Buffer) FileType() string {
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return b.Settings["filetype"].(string)
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}
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// ReOpen reloads the current buffer from disk
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func (b *Buffer) ReOpen() error {
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file, err := os.Open(b.Path)
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if err != nil {
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return err
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}
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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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reader := transform.NewReader(file, enc.NewDecoder())
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data, err := ioutil.ReadAll(reader)
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txt := string(data)
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if err != nil {
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return err
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}
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b.EventHandler.ApplyDiff(txt)
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b.ModTime, err = GetModTime(b.Path)
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b.isModified = false
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b.RelocateCursors()
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return err
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}
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func (b *Buffer) RelocateCursors() {
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for _, c := range b.cursors {
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c.Relocate()
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}
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}
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// RuneAt returns the rune at a given location in the buffer
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func (b *Buffer) RuneAt(loc Loc) rune {
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line := b.LineBytes(loc.Y)
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if len(line) > 0 {
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i := 0
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for len(line) > 0 {
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r, size := utf8.DecodeRune(line)
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line = line[size:]
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i++
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if i == loc.X {
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return r
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}
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}
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}
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return '\n'
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}
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// Modified returns if this buffer has been modified since
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// being opened
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func (b *Buffer) Modified() bool {
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if b.Type.Scratch {
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return false
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}
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if b.Settings["fastdirty"].(bool) {
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return b.isModified
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}
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var buff [md5.Size]byte
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calcHash(b, &buff)
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return buff != b.origHash
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}
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// calcHash calculates md5 hash of all lines in the buffer
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func calcHash(b *Buffer, out *[md5.Size]byte) error {
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h := md5.New()
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size := 0
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if len(b.lines) > 0 {
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n, e := h.Write(b.lines[0].data)
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if e != nil {
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return e
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}
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size += n
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for _, l := range b.lines[1:] {
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n, e = h.Write([]byte{'\n'})
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if e != nil {
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return e
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}
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size += n
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n, e = h.Write(l.data)
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if e != nil {
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return e
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}
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size += n
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}
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}
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if size > LargeFileThreshold {
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return ErrFileTooLarge
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}
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h.Sum((*out)[:0])
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return nil
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}
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// UpdateRules updates the syntax rules and filetype for this buffer
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// This is called when the colorscheme changes
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func (b *Buffer) UpdateRules() {
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if !b.Type.Syntax {
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return
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}
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rehighlight := false
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var files []*highlight.File
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for _, f := range config.ListRuntimeFiles(config.RTSyntax) {
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data, err := f.Data()
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if err != nil {
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screen.TermMessage("Error loading syntax file " + f.Name() + ": " + err.Error())
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} else {
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file, err := highlight.ParseFile(data)
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if err != nil {
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screen.TermMessage("Error loading syntax file " + f.Name() + ": " + err.Error())
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continue
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}
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ftdetect, err := highlight.ParseFtDetect(file)
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if err != nil {
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screen.TermMessage("Error loading syntax file " + f.Name() + ": " + err.Error())
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continue
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}
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ft := b.Settings["filetype"].(string)
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if (ft == "Unknown" || ft == "") && !rehighlight {
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if highlight.MatchFiletype(ftdetect, b.Path, b.lines[0].data) {
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header := new(highlight.Header)
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header.FileType = file.FileType
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header.FtDetect = ftdetect
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b.SyntaxDef, err = highlight.ParseDef(file, header)
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if err != nil {
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screen.TermMessage("Error loading syntax file " + f.Name() + ": " + err.Error())
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continue
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}
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rehighlight = true
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}
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} else {
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if file.FileType == ft && !rehighlight {
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header := new(highlight.Header)
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header.FileType = file.FileType
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header.FtDetect = ftdetect
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b.SyntaxDef, err = highlight.ParseDef(file, header)
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if err != nil {
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screen.TermMessage("Error loading syntax file " + f.Name() + ": " + err.Error())
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continue
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}
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rehighlight = true
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}
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}
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files = append(files, file)
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}
|
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}
|
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|
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if b.SyntaxDef != nil {
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highlight.ResolveIncludes(b.SyntaxDef, files)
|
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}
|
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|
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if b.Highlighter == nil || rehighlight {
|
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if b.SyntaxDef != nil {
|
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b.Settings["filetype"] = b.SyntaxDef.FileType
|
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b.Highlighter = highlight.NewHighlighter(b.SyntaxDef)
|
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if b.Settings["syntax"].(bool) {
|
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b.Highlighter.HighlightStates(b)
|
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}
|
||||
}
|
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}
|
||||
}
|
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|
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// ClearMatches clears all of the syntax highlighting for the buffer
|
||||
func (b *Buffer) ClearMatches() {
|
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for i := range b.lines {
|
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b.SetMatch(i, nil)
|
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b.SetState(i, nil)
|
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}
|
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}
|
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|
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// IndentString returns this buffer's indent method (a tabstop or n spaces
|
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// depending on the settings)
|
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func (b *Buffer) IndentString(tabsize int) string {
|
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if b.Settings["tabstospaces"].(bool) {
|
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return Spaces(tabsize)
|
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}
|
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return "\t"
|
||||
}
|
||||
|
||||
// SetCursors resets this buffer's cursors to a new list
|
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func (b *Buffer) SetCursors(c []*Cursor) {
|
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b.cursors = c
|
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b.EventHandler.cursors = b.cursors
|
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b.EventHandler.active = b.curCursor
|
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}
|
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|
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// AddCursor adds a new cursor to the list
|
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func (b *Buffer) AddCursor(c *Cursor) {
|
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b.cursors = append(b.cursors, c)
|
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b.EventHandler.cursors = b.cursors
|
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b.EventHandler.active = b.curCursor
|
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b.UpdateCursors()
|
||||
}
|
||||
|
||||
// SetCurCursor sets the current cursor
|
||||
func (b *Buffer) SetCurCursor(n int) {
|
||||
b.curCursor = n
|
||||
}
|
||||
|
||||
// GetActiveCursor returns the main cursor in this buffer
|
||||
func (b *Buffer) GetActiveCursor() *Cursor {
|
||||
return b.cursors[b.curCursor]
|
||||
}
|
||||
|
||||
// GetCursor returns the nth cursor
|
||||
func (b *Buffer) GetCursor(n int) *Cursor {
|
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return b.cursors[n]
|
||||
}
|
||||
|
||||
// GetCursors returns the list of cursors in this buffer
|
||||
func (b *Buffer) GetCursors() []*Cursor {
|
||||
return b.cursors
|
||||
}
|
||||
|
||||
// NumCursors returns the number of cursors
|
||||
func (b *Buffer) NumCursors() int {
|
||||
return len(b.cursors)
|
||||
}
|
||||
|
||||
// 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
|
||||
}
|
||||
b.EventHandler.cursors = b.cursors
|
||||
b.EventHandler.active = b.curCursor
|
||||
}
|
||||
|
||||
// UpdateCursors updates all the cursors indicies
|
||||
func (b *Buffer) UpdateCursors() {
|
||||
b.EventHandler.cursors = b.cursors
|
||||
b.EventHandler.active = b.curCursor
|
||||
for i, c := range b.cursors {
|
||||
c.Num = i
|
||||
}
|
||||
}
|
||||
|
||||
func (b *Buffer) RemoveCursor(i int) {
|
||||
copy(b.cursors[i:], b.cursors[i+1:])
|
||||
b.cursors[len(b.cursors)-1] = nil
|
||||
b.cursors = b.cursors[:len(b.cursors)-1]
|
||||
b.curCursor = Clamp(b.curCursor, 0, len(b.cursors)-1)
|
||||
b.UpdateCursors()
|
||||
}
|
||||
|
||||
// ClearCursors removes all extra cursors
|
||||
func (b *Buffer) ClearCursors() {
|
||||
for i := 1; i < len(b.cursors); i++ {
|
||||
b.cursors[i] = nil
|
||||
}
|
||||
b.cursors = b.cursors[:1]
|
||||
b.UpdateCursors()
|
||||
b.curCursor = 0
|
||||
b.GetActiveCursor().ResetSelection()
|
||||
}
|
||||
|
||||
// MoveLinesUp moves the range of lines up one row
|
||||
func (b *Buffer) MoveLinesUp(start int, end int) {
|
||||
if start < 1 || start >= end || end > len(b.lines) {
|
||||
return
|
||||
}
|
||||
l := string(b.LineBytes(start - 1))
|
||||
if end == len(b.lines) {
|
||||
b.Insert(
|
||||
Loc{
|
||||
utf8.RuneCount(b.lines[end-1].data),
|
||||
end - 1,
|
||||
},
|
||||
"\n"+l,
|
||||
)
|
||||
} else {
|
||||
b.Insert(
|
||||
Loc{0, end},
|
||||
l+"\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) {
|
||||
if start < 0 || start >= end || end >= len(b.lines)-1 {
|
||||
return
|
||||
}
|
||||
l := string(b.LineBytes(end))
|
||||
b.Insert(
|
||||
Loc{0, start},
|
||||
l+"\n",
|
||||
)
|
||||
end++
|
||||
b.Remove(
|
||||
Loc{0, end},
|
||||
Loc{0, end + 1},
|
||||
)
|
||||
}
|
||||
|
||||
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
|
||||
// TODO: maybe can be more efficient with utf8 package
|
||||
func (b *Buffer) FindMatchingBrace(braceType [2]rune, start Loc) Loc {
|
||||
curLine := []rune(string(b.LineBytes(start.Y)))
|
||||
startChar := curLine[start.X]
|
||||
var i int
|
||||
if startChar == braceType[0] {
|
||||
for y := start.Y; y < b.LinesNum(); y++ {
|
||||
l := []rune(string(b.LineBytes(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
|
||||
}
|
||||
|
||||
// Retab changes all tabs to spaces or vice versa
|
||||
func (b *Buffer) Retab() {
|
||||
toSpaces := b.Settings["tabstospaces"].(bool)
|
||||
tabsize := IntOpt(b.Settings["tabsize"])
|
||||
dirty := false
|
||||
|
||||
for i := 0; i < b.LinesNum(); i++ {
|
||||
l := b.LineBytes(i)
|
||||
|
||||
ws := GetLeadingWhitespace(l)
|
||||
if len(ws) != 0 {
|
||||
if toSpaces {
|
||||
ws = bytes.Replace(ws, []byte{'\t'}, bytes.Repeat([]byte{' '}, tabsize), -1)
|
||||
} else {
|
||||
ws = bytes.Replace(ws, bytes.Repeat([]byte{' '}, tabsize), []byte{'\t'}, -1)
|
||||
}
|
||||
}
|
||||
|
||||
l = bytes.TrimLeft(l, " \t")
|
||||
b.lines[i].data = append(ws, l...)
|
||||
dirty = true
|
||||
}
|
||||
|
||||
b.isModified = dirty
|
||||
}
|
||||
Reference in New Issue
Block a user