Add search and replace

src/buffer.go

@@ -3,6 +3,7 @@ package main
 import (
 	"github.com/vinzmay/go-rope"
 	"io/ioutil"
+	"regexp"
 	"strings"
 )
 
@@ -110,6 +111,21 @@ func (b *Buffer) Remove(start, end int) string {
 	return removed
 }
 
+func (b *Buffer) Replace(search, replace string) error {
+	re, err := regexp.Compile(search)
+	if err != nil {
+		return err
+	}
+	text := re.ReplaceAllString(b.text, replace)
+	if text == "" {
+		b.r = new(rope.Rope)
+	} else {
+		b.r = rope.New(text)
+	}
+	b.Update()
+	return nil
+}
+
 // Len gives the length of the buffer
 func (b *Buffer) Len() int {
 	return b.r.Len()

src/command.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"os"
+	"regexp"
 	"strings"
 )
 
@@ -35,5 +36,43 @@ func HandleCommand(input string, view *View) {
 		}
 	case "save":
 		view.Save()
+	case "replace":
+		r := regexp.MustCompile(`"[^"\\]*(?:\\.[^"\\]*)*"|[^\s]*`)
+		replaceCmd := r.FindAllString(strings.Join(args, " "), -1)
+		if len(replaceCmd) != 2 {
+			messenger.Error("Invalid replace statement: " + strings.Join(args, " "))
+			return
+		}
+
+		search := string(replaceCmd[0])
+		replace := string(replaceCmd[1])
+
+		if strings.HasPrefix(search, `"`) && strings.HasSuffix(search, `"`) {
+			search = search[1 : len(search)-1]
+		}
+		if strings.HasPrefix(replace, `"`) && strings.HasSuffix(replace, `"`) {
+			replace = replace[1 : len(replace)-1]
+		}
+
+		search = strings.Replace(search, `\"`, `"`, -1)
+		replace = strings.Replace(replace, `\"`, `"`, -1)
+
+		messenger.Error(search + " -> " + replace)
+
+		regex, err := regexp.Compile(search)
+		if err != nil {
+			messenger.Error(err.Error())
+			return
+		}
+
+		for {
+			match := regex.FindStringIndex(view.buf.text)
+			if match == nil {
+				break
+			}
+			view.eh.Replace(match[0], match[1], replace)
+		}
+	default:
+		messenger.Error("Unknown command: " + cmd)
 	}
 }

src/eventhandler.go

@@ -83,6 +83,12 @@ func (eh *EventHandler) Remove(start, end int) {
 	eh.Execute(e)
 }
 
+// Replace deletes from start to end and replaces it with the given string
+func (eh *EventHandler) Replace(start, end int, replace string) {
+	eh.Remove(start, end)
+	eh.Insert(start, replace)
+}
+
 // Execute a textevent and add it to the undo stack
 func (eh *EventHandler) Execute(t *TextEvent) {
 	if eh.redo.Len() > 0 {