scanner: Add --identifier-filter-cmd

Add the command line flag --identifier-filter-cmd to g-ir-scanner which
allows running identifier names through a filtering shell command. The
identifier is sent as stdin to the filter command and expects a filtered
result written to stdout.

https://bugzilla.gnome.org/show_bug.cgi?706898

2 files changed, 21 insertions, 2 deletions

diff --git a/giscanner/scannermain.py b/giscanner/scannermain.py
index 98d56878..ac340305 100755
--- a/giscanner/scannermain.py
+++ b/giscanner/scannermain.py
@@ -156,6 +156,11 @@ and --symbol-prefix.""")
                       help="""Remove this prefix from C identifiers (structure typedefs, etc.).
 May be specified multiple times.  This is also used as the default for --symbol-prefix if
 the latter is not specified.""")
+    parser.add_option("", "--identifier-filter-cmd",
+                      action="store", dest="identifier_filter_cmd", default='',
+                      help='Filter identifiers (struct and union typedefs) through the given '
+                           'shell command which will receive the identifier name as input '
+                           'to stdin and is expected to output the filtered results to stdout.')
     parser.add_option("", "--symbol-prefix",
                       action="append", dest="symbol_prefixes", default=[],
                       help="Remove this prefix from C symbols (function names)")
@@ -334,7 +339,8 @@ see --identifier-prefix and --symbol-prefix."""
 
 def create_transformer(namespace, options):
     transformer = Transformer(namespace,
-                              accept_unprefixed=options.accept_unprefixed)
+                              accept_unprefixed=options.accept_unprefixed,
+                              identifier_filter_cmd=options.identifier_filter_cmd)
     transformer.set_include_paths(options.include_paths)
     if options.passthrough_gir:
         transformer.disable_cache()
diff --git a/giscanner/transformer.py b/giscanner/transformer.py
index 80265dd8..8c5e9087 100644
--- a/giscanner/transformer.py
+++ b/giscanner/transformer.py
@@ -20,6 +20,7 @@
 
 import os
 import sys
+import subprocess
 
 from . import ast
 from . import message
@@ -49,7 +50,7 @@ if os.name != 'nt':
 class Transformer(object):
     namespace = property(lambda self: self._namespace)
 
-    def __init__(self, namespace, accept_unprefixed=False):
+    def __init__(self, namespace, accept_unprefixed=False, identifier_filter_cmd=''):
         self._cachestore = CacheStore()
         self._accept_unprefixed = accept_unprefixed
         self._namespace = namespace
@@ -58,6 +59,7 @@ class Transformer(object):
         self._parsed_includes = {}  # <string namespace -> Namespace>
         self._includepaths = []
         self._passthrough_mode = False
+        self._identifier_filter_cmd = identifier_filter_cmd
 
         # Cache a list of struct/unions in C's "tag namespace". This helps
         # manage various orderings of typedefs and structs. See:
@@ -293,6 +295,17 @@ raise ValueError."""
         return matches[-1]
 
     def strip_identifier(self, ident):
+        if self._identifier_filter_cmd:
+            proc = subprocess.Popen(self._identifier_filter_cmd,
+                                    stdin=subprocess.PIPE,
+                                    stdout=subprocess.PIPE,
+                                    stderr=subprocess.PIPE,
+                                    shell=True)
+            ident, err = proc.communicate(ident)
+            if proc.returncode:
+                raise ValueError('filter: "%s" exited: %d with error: %s' %
+                                 (self._identifier_filter_cmd, proc.returncode, err))
+
         hidden = ident.startswith('_')
         if hidden:
             ident = ident[1:]