frappy-edit: add default cfg path given typically at psi

Change-Id: I91032c912d76f555ae88e3e7ae313fa3c03948bd

frappy/tools/cfgedit.py

@@ -23,11 +23,13 @@ KEY.add(
 
 VERSION_SEPARATOR = "\n''''"
 TIMESTAMP_FMT = '%Y-%m-%d-%H%M%S'
+
+
+def get_timestamp(file):
+    return time.strftime(TIMESTAMP_FMT, time.localtime(file.stat().st_mtime))
+
 # TODO:
-# - ctrl-K: on previous versions copy and advance to next module
 # - use also shift-Tab for level up?
-# - directory to save to
-# - remove older versions, for which a newer exist already: a restore removes the older one
 
 
 def unix_cmd(cmd, *args):
@@ -749,7 +751,14 @@ class EditorMain(Main):
         except FileNotFoundError:
             sections = []
         self.versions = dict((v.split('\n', 1) for v in sections))
+        # the path every change is written to:
         self.tmppath = self.version_dir / f'{name}.current'
+        try:
+            # if a file exists already, add it to the version history
+            filecontent = self.tmppath.read_text()
+            self.add_version(filecontent, get_timestamp(self.tmppath))
+        except FileNotFoundError:
+            pass
         if cfgpath:
             cfgpaths = [cfgpath]
         else:
@@ -764,7 +773,7 @@ class EditorMain(Main):
                 self.cfgpath = cfgpath
                 if cfgpath != self.tmppath:
                     self.titlebar.mid = str(cfgpath)
-                timestamp = time.strftime(TIMESTAMP_FMT, time.localtime(cfgpath.stat().st_mtime))
+                timestamp = get_timestamp(cfgpath)
                 break
             except FileNotFoundError:
                 pass
@@ -864,6 +873,13 @@ class EditorMain(Main):
 
     def quit(self):
         self.save()
+        try:
+            filecontent = self.cfgpath.read_text()
+        except FileNotFoundError:
+            filecontent = ''
+        if filecontent == self.filecontent:
+            self.log.info('%s was not changed', self.cfgpath)
+            return True
         savedialog = SaveDialog(self.cfgpath)
         if savedialog.execute(self) == KEY.QUIT:
             filename = savedialog.filename
@@ -912,11 +928,21 @@ class EditorMain(Main):
         except Exception:
             print(formatExtendedTraceback())
         finally:
-            if self.pidfile:
+            if self.filecontent:
+                # add current content to the version history
+                try:
+                    self.add_version(self.filecontent, time.strftime(TIMESTAMP_FMT))
+                except FileNotFoundError:
+                    pass
+            if self.tmppath and self.tmppath.exists():
+                # no need to keep the temporary file, as it has been added to the versions
+                self.tmppath.unlink()
+            if self.pidfile and self.pidfile.exists():
                 self.pidfile.unlink()
 
 
 if __name__ == "__main__":
-    os.environ['FRAPPY_CONFDIR'] = 'cfg:cfg/main:cfg/stick:cfg/addons'
+    # os.environ['FRAPPY_CONFDIR'] = 'cfg:cfg/main:cfg/stick:cfg/addons'
     generalConfig.init()
+    os.environ['FRAPPY_CONFDIR']
     EditorMain(sys.argv[1]).run()