From 3fa73178baeb43cf5583cbb0bdceb4257cd7e737 Mon Sep 17 00:00:00 2001
From: Juergen Bocklage-Ryannel <juergen.bocklage-ryannel@pelagicore.com>
Date: Fri, 3 Feb 2017 09:22:25 +0100
Subject: Added reload option to qtcpp generator. Allows to watch recursive the
 source directories and run the generator script when changes appear

---
 qface/builtin/qtcpp/qtcpp.py | 10 ++++++--
 qface/watch.py               | 55 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 63 insertions(+), 2 deletions(-)
 create mode 100644 qface/watch.py

diff --git a/qface/builtin/qtcpp/qtcpp.py b/qface/builtin/qtcpp/qtcpp.py
index 2e53edb..ed2d1f4 100755
--- a/qface/builtin/qtcpp/qtcpp.py
+++ b/qface/builtin/qtcpp/qtcpp.py
@@ -10,6 +10,7 @@ from path import Path
 from qface.generator import FileSystem, Generator
 from qface.helper.qtcpp import Filters
 from qface.helper.doc import parse_doc
+from qface.watch import monitor
 
 
 here = Path(__file__).dirname()
@@ -59,12 +60,17 @@ def run(src, dst):
 
 
 @click.command()
+@click.option('--reload/--no-reload', default=False)
 @click.argument('src', nargs=-1, type=click.Path(exists=True))
 @click.argument('dst', nargs=1, type=click.Path(exists=True))
-def app(src, dst):
+def app(src, dst, reload):
     """Takes several files or directories as src and generates the code
     in the given dst directory."""
-    run(src, dst)
+    if reload:
+        script = '{0} {1} {2}'.format(Path(__file__).abspath(), ' '.join(src), dst)
+        monitor(src, script)
+    else:
+        run(src, dst)
 
 
 if __name__ == '__main__':
diff --git a/qface/watch.py b/qface/watch.py
new file mode 100644
index 0000000..89d07e4
--- /dev/null
+++ b/qface/watch.py
@@ -0,0 +1,55 @@
+from watchdog.events import FileSystemEventHandler
+from watchdog.observers import Observer
+import click
+from subprocess import call
+from path import Path
+import time
+
+
+def sh(cmd, all=False, **kwargs):
+    click.secho('$ {0}'.format(cmd), fg='green')
+    return call(cmd, shell=True, **kwargs)
+
+
+class RunScriptChangeHandler(FileSystemEventHandler):
+    def __init__(self, script):
+        super().__init__()
+        self.script = script
+        self.is_running = False
+
+    def on_modified(self, event):
+        self.run()
+
+    def run(self):
+        if self.is_running:
+            return
+        self.is_running = True
+        sh(self.script, cwd=Path.getcwd())
+        self.is_running = False
+
+
+def monitor(src, script):
+    """
+    reloads the script when src files changes
+    """
+    script = Path(script).expand().abspath()
+    src = src if isinstance(src, (list, tuple)) else [src]
+    src = [Path(entry).expand().abspath() for entry in src]
+    event_handler = RunScriptChangeHandler(script)
+    observer = Observer()
+    path = script.dirname().expand().abspath()
+    click.secho('watch recursive: {0}'.format(path), fg='blue')
+    observer.schedule(event_handler, path, recursive=True)
+    for entry in src:
+        entry = entry.dirname().expand().abspath()
+        click.secho('watch recursive: {0}'.format(entry), fg='blue')
+        observer.schedule(event_handler, entry, recursive=True)
+    event_handler.run()  # run always once
+    observer.start()
+
+    try:
+        while True:
+            time.sleep(1)
+    except KeyboardInterrupt:
+        observer.stop()
+    observer.join()
-- 
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