feat(*):support clear screen when rebuild

Author: jingdi.zhu

runner/config.go

@@ -21,13 +21,14 @@ const (
 )
 
 type config struct {
-	Root        string   `toml:"root"`
-	TmpDir      string   `toml:"tmp_dir"`
-	TestDataDir string   `toml:"testdata_dir"`
-	Build       cfgBuild `toml:"build"`
-	Color       cfgColor `toml:"color"`
-	Log         cfgLog   `toml:"log"`
-	Misc        cfgMisc  `toml:"misc"`
+	Root        string    `toml:"root"`
+	TmpDir      string    `toml:"tmp_dir"`
+	TestDataDir string    `toml:"testdata_dir"`
+	Build       cfgBuild  `toml:"build"`
+	Color       cfgColor  `toml:"color"`
+	Log         cfgLog    `toml:"log"`
+	Misc        cfgMisc   `toml:"misc"`
+	Screen      cfgScreen `toml:"screen"`
 }
 
 type cfgBuild struct {
@@ -79,6 +80,10 @@ type cfgMisc struct {
 	CleanOnExit bool `toml:"clean_on_exit"`
 }
 
+type cfgScreen struct {
+	ClearOnRebuild bool `toml:"clear_on_rebuild"`
+}
+
 func initConfig(path string) (cfg *config, err error) {
 	if path == "" {
 		cfg, err = defaultPathConfig()

runner/engine.go

@@ -1,6 +1,7 @@
 package runner
 
 import (
+	"fmt"
 	"io"
 	"os"
 	"os/exec"
@@ -319,17 +320,24 @@ func (e *Engine) start() {
 					continue
 				}
 			}
+			// clean on rebuild https://stackoverflow.com/questions/22891644/how-can-i-clear-the-terminal-screen-in-go
+			if e.config.Screen.ClearOnRebuild {
+				fmt.Println("\033[2J")
+			}
 			e.mainLog("%s has changed", e.config.rel(filename))
 		case <-firstRunCh:
 			// go down
 			break
 		}
 
+		// already build and run now
 		select {
 		case <-e.buildRunCh:
 			e.buildRunStopCh <- true
 		default:
 		}
+
+		// if current app is running, stop it
 		e.withLock(func() {
 			if e.binRunning {
 				e.binStopCh <- true