Keep user changes for ".gitignore" file when re-generate/update project data

HISTORY.rst

@@ -11,6 +11,7 @@ PlatformIO 2.0
   (from EEMEM directive)
 * Improved project generator for `CLion IDE <http://docs.platformio.org/en/latest/ide/clion.html>`__
 * Auto-remove project cache when PlatformIO is upgraded
+* Keep user changes for ``.gitignore`` file when re-generate/update project data
 * Fixed missed ``--boot`` flag for the firmware uploader for ATSAM3X8E
   Cortex-M3 MCU based boards (Arduino Due, etc)
   (`issue #710 <https://github.com/platformio/platformio/issues/710>`_)

platformio/ide/projectgenerator.py

@@ -16,8 +16,8 @@ import json
 import os
 import re
 import sys
-from os.path import (abspath, basename, expanduser, isdir, join, normpath,
+from os.path import (abspath, basename, expanduser, isdir, isfile, join,
-                     relpath)
+                     normpath, relpath)
 
 import bottle
 
@@ -113,16 +113,18 @@ class ProjectGenerator(object):
         return tpls
 
     def generate(self):
-        for _relpath, _path in self.get_tpls():
+        for tpl_relpath, tpl_path in self.get_tpls():
-            tpl_dir = self.project_dir
+            dst_dir = self.project_dir
-            if _relpath:
+            if tpl_relpath:
-                tpl_dir = join(self.project_dir, _relpath)
+                dst_dir = join(self.project_dir, tpl_relpath)
-                if not isdir(tpl_dir):
+                if not isdir(dst_dir):
-                    os.makedirs(tpl_dir)
+                    os.makedirs(dst_dir)
 
-            file_name = basename(_path)[:-4]
+            file_name = basename(tpl_path)[:-4]
-            with open(join(tpl_dir, file_name), "w") as f:
+            self._merge_contents(
-                f.write(self._render_tpl(_path).encode("utf8"))
+                join(dst_dir, file_name),
+                self._render_tpl(tpl_path).encode("utf8")
+            )
 
     def _render_tpl(self, tpl_path):
         content = ""
@@ -130,6 +132,22 @@ class ProjectGenerator(object):
             content = f.read()
         return bottle.template(content, **self._tplvars)
 
+    def _merge_contents(self, dst_path, contents):
+        file_name = basename(dst_path)
+
+        # merge .gitignore
+        if file_name == ".gitignore" and isfile(dst_path):
+            contents = [l.strip() for l in contents.split("\n") if l.strip()]
+            with open(dst_path) as f:
+                for line in f.readlines():
+                    line = line.strip()
+                    if line and line not in contents:
+                        contents.append(line)
+            contents = "\n".join(contents)
+
+        with open(dst_path, "w") as f:
+            f.write(contents)
+
     def _gather_tplvars(self):
         self._tplvars.update(self.get_project_env())
         self._tplvars.update(self.get_project_build_data())