Method Revert

texteditor/buffer.go:370–404

Revert re-opens text from the current file, if the filename is set; returns false if not. It uses an optimized diff-based update to preserve existing formatting, making it very fast if not very different.

()

// It uses an optimized diff-based update to preserve
// existing formatting, making it very fast if not very different.
func (tb *Buffer) Revert() bool { //types:add
	tb.StopDelayedReMarkup()
	tb.AutoSaveDelete() // justin case
	if tb.Filename == "" {
		return false
	}

	didDiff := false
	if tb.NumLines() < diffRevertLines {
		ob := NewBuffer()
		err := ob.openFile(tb.Filename)
		if errors.Log(err) != nil {
			sc := tb.sceneFromEditor()
			if sc != nil { // only if viewing
				core.ErrorSnackbar(sc, err, "Error reopening file")
			}
			return false
		}
		tb.Stat() // "own" the new file..
		if ob.NumLines() < diffRevertLines {
			diffs := tb.DiffBuffers(&ob.Lines)
			if len(diffs) < diffRevertDiffs {
				tb.PatchFromBuffer(&ob.Lines, diffs)
				didDiff = true
			}
		}
	}
	if !didDiff {
		tb.openFile(tb.Filename)
	}
	tb.clearNotSaved()
	tb.AutoSaveDelete()
	tb.signalEditors(bufferNew, nil)
	return true
}

// SaveAsFunc saves the current text into the given file.
// Does an editDone first to save edits and checks for an existing file.