From 73b3c9d1ecaec8a3c116c4a2b85f5f34c3380712 Mon Sep 17 00:00:00 2001
From: Charles Dudley <cd@charlesdudley.com>
Date: Tue, 17 Apr 2018 17:36:04 -0500
Subject: [PATCH] added config flag to clear the buffer on file changes

---
 README.md        | 40 ++++++++++++++++++++++++++++++++++++----
 watch-package.js | 16 ++++++++++++++++
 2 files changed, 52 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index f3b35f8..d6dc24f 100644
--- a/README.md
+++ b/README.md
@@ -27,8 +27,7 @@ Possibilty to watch for different tasks
 
 ```javascript
   {
-    "watch": 
-      {
+    "watch": {
       "run_android": {
         "patterns": [
           "app"
@@ -53,8 +52,7 @@ Possibilty to watch for different tasks
   }
 ```
 
-
-The keys of the `"watch"` config should match the names of your `"scripts"`, and
+The top level keys of the `"watch"` config should match the names of your `"scripts"`, and
 the values should be a glob pattern or array of glob patterns to watch.
 
 Also it is now possible to obtain a second parameter to define the script which should be run for watching and not watch all possible scripts at once.
@@ -120,6 +118,40 @@ EOF
 
 Tests run *perfectly*, ship it to the enterprise!
 
+### Options
+
+#### `patterns`
+
+Array of paths to watch
+
+#### `extensions`
+
+Array of file extensions to watch
+
+#### `ignore`
+
+String or array of paths to ignore
+
+#### `quiet`
+
+Boolean to hide the script name in any output on stdout and stderr
+
+#### `inherit`
+
+Boolean to preserve the original process' stdout and stderr
+
+#### `legacyWatch`
+
+Boolean to enable [legacy watch](https://github.com/remy/nodemon#application-isnt-restarting)
+
+#### `delay`
+
+Number of milliseconds to [delay](https://github.com/remy/nodemon#delaying-restarting) before checking for new files
+
+#### `clearBuffer`
+
+Boolean to clear the buffer after detecting a new change
+
 ## Acknowledgements
 
 This module does very little but run [`nodemon`](http://npm.im/nodemon) for you, all
diff --git a/watch-package.js b/watch-package.js
index 978b745..2d73eab 100644
--- a/watch-package.js
+++ b/watch-package.js
@@ -7,6 +7,7 @@ var through = require('through2')
 
 var npm = process.platform === 'win32' ? 'npm.cmd' : 'npm';
 var nodemon = process.platform === 'win32' ? 'nodemon.cmd' : 'nodemon';
+var clearCharacter = process.platform === 'win32' ? '\x1B[2J\x1B[0f' : '\x1B[2J\x1B[3J\x1B[H';
 
 var pkgDir = '';
 var stdin = null;
@@ -94,6 +95,7 @@ function startScript(script, pkg, processes) {
     var inherit = null
     var legacyWatch = null
     var delay = null
+    var clearBuffer = null
 
     if (typeof pkg.watch[script] === 'object' && !Array.isArray(pkg.watch[script])) {
       patterns = pkg.watch[script].patterns
@@ -103,6 +105,7 @@ function startScript(script, pkg, processes) {
       inherit = pkg.watch[script].inherit
       legacyWatch = pkg.watch[script].legacyWatch
       delay = pkg.watch[script].delay
+      clearBuffer = pkg.watch[script].clearBuffer
     } else {
       patterns = pkg.watch[script]
     }
@@ -133,6 +136,19 @@ function startScript(script, pkg, processes) {
       stdio: inherit === true ? ['pipe', 'inherit', 'pipe'] : 'pipe'
     })
     if (inherit === true) return;
+
+    if (clearBuffer === true) {
+      proc.stdout.pipe(
+        through(function(line, _, callback) {
+          line = line.toString();
+          if (line.match('restarting due to changes...')) {
+            stdin.stdout.write(clearCharacter);
+          }
+          callback()
+        })
+      )
+    }
+
     if (quiet === true || quiet === 'true') {
       proc.stdout.pipe(stdin.stdout)
       proc.stderr.pipe(stdin.stderr)