mirror of
https://github.com/zyedidia/micro.git
synced 2026-02-05 06:30:28 +09:00
118 lines
2.7 KiB
Go
118 lines
2.7 KiB
Go
package main
|
|
|
|
import (
|
|
"github.com/vinzmay/go-rope"
|
|
"io/ioutil"
|
|
"strings"
|
|
)
|
|
|
|
// 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 {
|
|
// Stores the text of the buffer
|
|
r *rope.Rope
|
|
|
|
// Path to the file on disk
|
|
path string
|
|
// Name of the buffer on the status line
|
|
name string
|
|
|
|
// This is the text stored every time the buffer is saved to check if the buffer is modified
|
|
savedText string
|
|
|
|
// Provide efficient and easy access to text and lines so the rope String does not
|
|
// need to be constantly recalculated
|
|
// These variables are updated in the update() function
|
|
text string
|
|
lines []string
|
|
|
|
// Syntax highlighting rules
|
|
rules []SyntaxRule
|
|
// The buffer's filetype
|
|
filetype string
|
|
}
|
|
|
|
// NewBuffer creates a new buffer from `txt` with path and name `path`
|
|
func NewBuffer(txt, path string) *Buffer {
|
|
b := new(Buffer)
|
|
if txt == "" {
|
|
b.r = new(rope.Rope)
|
|
} else {
|
|
b.r = rope.New(txt)
|
|
}
|
|
b.path = path
|
|
b.name = path
|
|
b.savedText = txt
|
|
|
|
b.Update()
|
|
b.UpdateRules()
|
|
|
|
return b
|
|
}
|
|
|
|
// UpdateRules updates the syntax rules and filetype for this buffer
|
|
// This is called when the colorscheme changes
|
|
func (b *Buffer) UpdateRules() {
|
|
b.rules, b.filetype = GetRules(b)
|
|
}
|
|
|
|
// Update fetches the string from the rope and updates the `text` and `lines` in the buffer
|
|
func (b *Buffer) Update() {
|
|
if b.r.Len() == 0 {
|
|
b.text = ""
|
|
} else {
|
|
b.text = b.r.String()
|
|
}
|
|
b.lines = strings.Split(b.text, "\n")
|
|
}
|
|
|
|
// Save saves the buffer to its default path
|
|
func (b *Buffer) Save() error {
|
|
return b.SaveAs(b.path)
|
|
}
|
|
|
|
// 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()
|
|
err := ioutil.WriteFile(filename, []byte(b.text), 0644)
|
|
if err == nil {
|
|
b.savedText = b.text
|
|
}
|
|
return err
|
|
}
|
|
|
|
// IsDirty returns whether or not the buffer has been modified compared to the one on disk
|
|
func (b *Buffer) IsDirty() bool {
|
|
return b.savedText != b.text
|
|
}
|
|
|
|
// Insert a string into the rope
|
|
func (b *Buffer) Insert(idx int, value string) {
|
|
b.r = b.r.Insert(idx, value)
|
|
b.Update()
|
|
}
|
|
|
|
// Remove a slice of the rope from start to end (exclusive)
|
|
// Returns the string that was removed
|
|
func (b *Buffer) Remove(start, end int) string {
|
|
if start < 0 {
|
|
start = 0
|
|
}
|
|
if end > b.Len() {
|
|
end = b.Len()
|
|
}
|
|
removed := b.text[start:end]
|
|
// The rope implenentation I am using wants indicies starting at 1 instead of 0
|
|
start++
|
|
end++
|
|
b.r = b.r.Delete(start, end-start)
|
|
b.Update()
|
|
return removed
|
|
}
|
|
|
|
// Len gives the length of the buffer
|
|
func (b *Buffer) Len() int {
|
|
return b.r.Len()
|
|
}
|