Better backup behavior

cmd/micro/micro.go

@@ -190,6 +190,10 @@ func main() {
 		if err := recover(); err != nil {
 			screen.Screen.Fini()
 			fmt.Println("Micro encountered an error:", err)
+			// backup all open buffers
+			for _, b := range buffer.OpenBuffers {
+				b.Backup(false)
+			}
 			// Print the stack trace too
 			fmt.Print(errors.Wrap(err, 2).ErrorStack())
 			os.Exit(1)

internal/buffer/backup.go

@@ -25,15 +25,17 @@ The backup was created at %s.
 Options: [r]ecover, [i]gnore: `
 
 // Backup saves the current buffer to ConfigDir/backups
-func (b *Buffer) Backup() error {
+func (b *Buffer) Backup(checkTime bool) error {
 	if !b.Settings["backup"].(bool) {
 		return nil
 	}
 
-	sub := time.Now().Sub(b.lastbackup)
-	if sub < time.Duration(backup_time)*time.Millisecond {
-		log.Println("Backup event but not enough time has passed", sub)
-		return nil
+	if checkTime {
+		sub := time.Now().Sub(b.lastbackup)
+		if sub < time.Duration(backup_time)*time.Millisecond {
+			log.Println("Backup event but not enough time has passed", sub)
+			return nil
+		}
 	}
 
 	b.lastbackup = time.Now()

internal/buffer/buffer.go

@@ -217,6 +217,7 @@ func NewBuffer(r io.Reader, size int64, path string, startcursor Loc, btype BufT
 					if choice%2 == 0 {
 						// recover
 						b.LineArray = NewLineArray(uint64(size), FFAuto, backup)
+						b.isModified = true
 					} else if choice%2 == 1 {
 						// delete
 						os.Remove(backupfile)
@@ -334,7 +335,7 @@ func (b *Buffer) Insert(start Loc, text string) {
 		b.EventHandler.active = b.curCursor
 		b.EventHandler.Insert(start, text)
 
-		go b.Backup()
+		go b.Backup(true)
 	}
 }
 
@@ -344,7 +345,7 @@ func (b *Buffer) Remove(start, end Loc) {
 		b.EventHandler.active = b.curCursor
 		b.EventHandler.Remove(start, end)
 
-		go b.Backup()
+		go b.Backup(true)
 	}
 }
 

runtime/help/options.md

@@ -22,6 +22,17 @@ Here are the options that you can set:
 
 	default value: `0`
 
+* `backup`: micro will automatically keep backups of all open buffers. Backups
+   are stored in `~/.config/micro/backups` and are removed when the buffer is
+   closed cleanly. In the case of a system crash or a micro crash, the contents
+   of the buffer can be recovered automatically by opening the file that
+   was being edited before the crash, or manually by searching for the backup
+   in the backup directory. Backups are made in the background when a buffer is
+   modified and the latest backup is more than 8 seconds old, or when micro
+   detects a crash. It is highly recommended that you leave this feature enabled.
+
+    default value: `true`
+
 * `basename`: in the infobar, show only the basename of the file being edited
    rather than the full path.