[Diff][Fixed] Problems when no changes to stash

- "git stash push" always returns 0, even if nothing was stashed.
- But "git stash pop" returns 1 if nothing stashed.
- So now we check using "git stash list".

Related to #265

kibot/out_diff.py

@@ -6,6 +6,7 @@
 """
 Dependencies:
   - name: KiCad PCB/SCH Diff
+    version: 2.4.1
     role: mandatory
     github: INTI-CMNB/KiDiff
     command: kicad-diff.py
@@ -30,6 +31,7 @@ from .macros import macros, document, output_class  # noqa: F401
 from . import log
 
 logger = log.get_logger()
+STASH_MSG = 'KiBot_Changes_Entry'
 
 
 def debug_output(res):
@@ -145,7 +147,11 @@ class DiffOptions(BaseOptions):
             self.run_git(['checkout', self.branch])
         if self.stashed:
             logger.debug('Restoring changes')
-            self.run_git(['stash', 'pop'])
+            # We don't know if we stashed anything (push always returns 0)
+            # So we check that the last stash contains our message
+            res = self.run_git(['stash', 'list', 'stash@{0}'])
+            if STASH_MSG in res:
+                self.run_git(['stash', 'pop', '--index'])
 
     def solve_git_name(self, name):
         ori = name
@@ -184,7 +190,7 @@ class DiffOptions(BaseOptions):
         try:
             # Save current changes
             logger.debug('Saving current changes')
-            self.run_git(['stash', 'push'])
+            self.run_git(['stash', 'push', '-m', STASH_MSG])
             self.stashed = True
             # Find the current branch
             self.branch = self.run_git(['rev-parse', '--abbrev-ref', 'HEAD'])

tests/test_plot/test_misc.py

@@ -1309,7 +1309,7 @@ def test_diff_git_1(test_dir):
 
 
 def test_diff_git_2(test_dir):
-    """ Difference between the two repo points """
+    """ Difference between the two repo points, wipe the current file """
     prj = 'light_control'
     yaml = 'diff_git_2'
     ctx = context.TestContext(test_dir, prj, yaml)
@@ -1341,3 +1341,36 @@ def test_diff_git_2(test_dir):
     ctx.run(extra=['-b', file], no_board_file=True, extra_debug=True)
     ctx.compare_pdf(prj+'-diff.pdf')
     ctx.clean_up(keep_project=True)
+
+
+def test_diff_git_3(test_dir):
+    """ Difference between the two repo points, no changes to stash """
+    prj = 'light_control'
+    yaml = 'diff_git_2'
+    ctx = context.TestContext(test_dir, prj, yaml)
+    # Create a git repo
+    git_init(ctx)
+    # Copy the "old" file
+    pcb = prj+'.kicad_pcb'
+    file = ctx.get_out_path(pcb)
+    shutil.copy2(ctx.board_file, file)
+    shutil.copy2(ctx.board_file.replace('.kicad_pcb', context.KICAD_SCH_EXT),
+                 file.replace('.kicad_pcb', context.KICAD_SCH_EXT))
+    # Add it to the repo
+    ctx.run_command(['git', 'add', pcb], chdir_out=True)
+    ctx.run_command(['git', 'commit', '-m', 'Reference'], chdir_out=True)
+    # Add an extra commit
+    dummy = ctx.get_out_path('dummy')
+    with open(dummy, 'wt') as f:
+        f.write('dummy\n')
+    ctx.run_command(['git', 'add', 'dummy'], chdir_out=True)
+    ctx.run_command(['git', 'commit', '-m', 'Dummy noise'], chdir_out=True)
+    # Copy the "new" file
+    shutil.copy2(ctx.board_file.replace(prj, prj+'_diff'), file)
+    # Add it to the repo
+    ctx.run_command(['git', 'add', pcb], chdir_out=True)
+    ctx.run_command(['git', 'commit', '-m', 'New version'], chdir_out=True)
+    # Run the test
+    ctx.run(extra=['-b', file], no_board_file=True, extra_debug=True)
+    ctx.compare_pdf(prj+'-diff.pdf')
+    ctx.clean_up(keep_project=True)

tests/utils/context.py

@@ -333,7 +333,7 @@ class TestContext(object):
         if chdir_out:
             cwd = os.getcwd()
             os.chdir(self.output_dir)
-        logging.debug('Executing: '+str(cmd))
+        logging.debug('Executing: '+usable_cmd(cmd))
         try:
             res = subprocess.run(cmd, check=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
         except subprocess.CalledProcessError as e: