Tools: Add a remove_mutter_versions.py script

Author: leolost2605

tools/remove_mutter_versions.py

@@ -0,0 +1,96 @@
+# Simple script to remove mutter version blocks from vala files up to the specified version.
+#
+# For example for a block
+#
+# #if HAS_MUTTER44
+# ...
+# #else
+# ...
+# #endif
+#
+# and a specified version of 44 or higher only the code between #if and #else will be kept.
+
+import os
+import re
+import sys
+
+class MutterBlock:
+    def __init__(self):
+        self.skip_block = False
+        self.discard = False
+        self.keep_endif = False
+
+
+def remove_mutter_blocks(file_path, version):
+    print ("Removing mutter blocks from file: " + file_path + " for version: " + str(version))
+
+    with open(file_path, 'r') as file:
+        lines = file.readlines()
+
+    output_lines = []
+    blocks = [MutterBlock()]
+    version_pattern = re.compile(r'(#if|#elif) (!)?HAS_MUTTER(\d+)')
+
+    for line in lines:
+        if line.startswith("#if"):
+            blocks.append(MutterBlock())
+
+        if version_pattern.match(line):
+            match = version_pattern.match(line)
+
+            current_version = int(match.group(3))
+            if current_version <= version:
+                if not blocks[-1].skip_block and match.group(2) == "!":
+                    blocks[-1].skip_block = True
+                    blocks[-1].discard = True
+                    continue
+                elif not blocks[-1].skip_block and match.group(1) == "#elif":
+                    output_lines.append("#else\n")
+                    blocks[-1].keep_endif = True
+                elif blocks[-1].skip_block: # we are already skipping so we probably are in an #elif block with an even lower version so we can discard right away
+                    blocks[-1].discard = True
+
+                blocks[-1].skip_block = True
+                continue
+        elif blocks[-1].skip_block and line.strip() == '#else':
+            blocks[-1].discard = not blocks[-1].discard
+            continue
+        elif line.strip() == '#endif':
+            block = blocks.pop()
+            if block.skip_block and not block.keep_endif:
+                continue
+
+        discard = False
+        for b in blocks:
+            if b.discard:
+                discard = True
+                break
+
+        if not discard:
+            output_lines.append(line)
+
+    with open(file_path, 'w') as file:
+        file.writelines(output_lines)
+
+def remove_recursive(file_path, version):
+    for file in os.listdir(file_path):
+        if os.path.isdir(file_path + "/" + file) and not file.startswith(".") and not "build" in file:
+            remove_recursive(file_path + "/" + file, version)
+        elif file.endswith(".vala") or file.endswith(".vapi"):
+            remove_mutter_blocks(file_path + "/" + file, version)
+
+if __name__ == "__main__":
+    if len(sys.argv) != 3:
+        print("Usage: python remove_mutter_versions.py <file_path> <version>")
+        sys.exit(1)
+
+    file_path = sys.argv[1]
+    version = int(sys.argv[2])
+
+    if os.path.isdir(file_path):
+        print ("Removing mutter blocks from all vala files in dir and subdirs: " + sys.argv[1] + " for version: " + sys.argv[2])
+        remove_recursive(file_path, version)
+    else:
+        remove_mutter_blocks(file_path, version)
+
+    print ("Done! Also don't forget to update the meson.build files, README and remove outdated vapi.")