[gobject-introspection] giscanner: give pointer to original comment block...

[Colin Walters <walters src gnome org>]

commit cc96177ec877153e7e5e55e6af270829da546015
Author: Dieter Verfaillie <dieterv optionexplicit be>
Date:   Tue May 28 17:20:49 2013 +0200

    giscanner: give pointer to original comment block...
    
    ...when complaining about multiple comment blocks
    documenting the same identifier.

 giscanner/annotationparser.py |   18 ++++++++++--------
 giscanner/message.py          |   11 +++++++----
 tests/warn/annotationparser.h |   19 ++++++++++++++-----
 3 files changed, 31 insertions(+), 17 deletions(-)
---
diff --git a/giscanner/annotationparser.py b/giscanner/annotationparser.py
index f5205a5..d5da84c 100644
--- a/giscanner/annotationparser.py
+++ b/giscanner/annotationparser.py
@@ -105,6 +105,7 @@ Refer to the `GTK-Doc manual`_ for more detailed usage information.
 '''
 
 
+import os
 import re
 
 from . import message
@@ -856,15 +857,16 @@ class GtkDocCommentBlockParser(object):
                 continue
 
             if comment_block is not None:
-                # Note: previous versions of this parser did not check
-                # if an identifier was already stored in comment_blocks,
-                # so when multiple comment blocks where encountered documenting
-                # the same identifier the last one seen "wins".
-                # Keep this behavior for backwards compatibility, but
-                # emit a warning.
+                # Note: previous versions of this parser did not check if an identifier was
+                #       already stored in comment_blocks, so when different comment blocks where
+                #       encountered documenting the same identifier the last comment block seen
+                #       "wins". Keep this behavior for backwards compatibility, but emit a warning.
                 if comment_block.name in comment_blocks:
-                    message.warn("multiple comment blocks documenting '%s:' identifier." %
-                                 (comment_block.name, ),
+                    firstseen = comment_blocks[comment_block.name]
+                    path = os.path.dirname(firstseen.position.filename)
+                    message.warn('multiple comment blocks documenting \'%s:\' identifier '
+                                 '(already seen at %s).' %
+                                 (comment_block.name, firstseen.position.format(path)),
                                  comment_block.position)
 
                 comment_blocks[comment_block.name] = comment_block
diff --git a/giscanner/message.py b/giscanner/message.py
index fc6100e..eca425a 100644
--- a/giscanner/message.py
+++ b/giscanner/message.py
@@ -53,9 +53,12 @@ class Position(object):
             self.column or -1)
 
     def format(self, cwd):
-        filename = self.filename
-        if filename.startswith(cwd):
-            filename = filename[len(cwd):]
+        filename = os.path.realpath(self.filename)
+        cwd = os.path.realpath(cwd)
+        common_prefix = os.path.commonprefix((filename, cwd))
+        if common_prefix:
+            filename = os.path.relpath(filename, common_prefix)
+
         if self.column is not None:
             return '%s:%d:%d' % (filename, self.line, self.column)
         elif self.line is not None:
@@ -73,7 +76,7 @@ class MessageLogger(object):
     def __init__(self, namespace, output=None):
         if output is None:
             output = sys.stderr
-        self._cwd = os.getcwd() + os.sep
+        self._cwd = os.getcwd()
         self._output = output
         self._namespace = namespace
         self._enable_warnings = False
diff --git a/tests/warn/annotationparser.h b/tests/warn/annotationparser.h
index 87b632f..db04b5a 100644
--- a/tests/warn/annotationparser.h
+++ b/tests/warn/annotationparser.h
@@ -1,18 +1,27 @@
 #include "common.h"
 
 /**
- * test_symbol_twice_documented:
+ * test_symbol_thrice_documented:
  *
  * Documenting the same thing multiple times can lead to subtle bugs.
  * For example, one comment block might have correct annotations...
  **/
-void test_symbol_twice_documented();
+void test_symbol_thrice_documented();
 
 /**
- * test_symbol_twice_documented:
+ * test_symbol_thrice_documented:
  *
  * ...and a different comment block (out of sync with the above) might have
- * no annotations at all. The last comment block seen by the parser "wins".
+ * no annotations at all. The last comment block seen by the parser "wins"...
  **/
 
-// EXPECT:12: Warning: Test: multiple comment blocks documenting 'test_symbol_twice_documented:' identifier.
+// EXPECT:12: Warning: Test: multiple comment blocks documenting 'test_symbol_thrice_documented:' identifier 
(already seen at annotationparser.h:4).
+
+
+/**
+ * test_symbol_thrice_documented:
+ *
+ * ...and yet another one.
+ **/
+
+// EXPECT:22: Warning: Test: multiple comment blocks documenting 'test_symbol_thrice_documented:' identifier 
(already seen at annotationparser.h:12).