Start implementing backup system

internal/buffer/backup.go

@@ -0,0 +1,49 @@
+package buffer
+
+import (
+	"io"
+
+	"github.com/zyedidia/micro/internal/config"
+	"github.com/zyedidia/micro/internal/util"
+	"golang.org/x/text/encoding"
+)
+
+// Backup saves the current buffer to ConfigDir/backups
+func (b *Buffer) Backup() error {
+	if !b.Settings["backup"].(bool) {
+		return nil
+	}
+
+	name := config.ConfigDir + "/backups" + util.EscapePath(b.AbsPath)
+
+	err := overwriteFile(name, encoding.Nop, func(file io.Writer) (e error) {
+		if len(b.lines) == 0 {
+			return
+		}
+
+		// end of line
+		eol := []byte{'\n'}
+
+		// write lines
+		if _, 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
+			}
+		}
+		return
+	})
+
+	return err
+}
+
+// ApplyBackup applies the corresponding backup file to this buffer (if one exists)
+func (b *Buffer) ApplyBackup() error {
+	return nil
+}

internal/config/settings.go

@@ -155,6 +155,7 @@ func GetGlobalOption(name string) interface{} {
 
 var defaultCommonSettings = map[string]interface{}{
 	"autoindent":     true,
+	"backup":         true,
 	"basename":       false,
 	"colorcolumn":    float64(0),
 	"cursorline":     true,