Merge pull request #1504 from Repiteo/pre-commit-hooks

Replace legacy hooks with `pre-commit` Python tool

1 files changed, 127 insertions, 0 deletions

diff --git a/misc/scripts/header_guards.py b/misc/scripts/header_guards.py
new file mode 100644
index 0000000..c99c422
--- /dev/null
+++ b/misc/scripts/header_guards.py
@@ -0,0 +1,127 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+import sys
+from pathlib import Path
+
+if len(sys.argv) < 2:
+    print("Invalid usage of header_guards.py, it should be called with a path to one or multiple files.")
+    sys.exit(1)
+
+HEADER_CHECK_OFFSET = 30
+HEADER_BEGIN_OFFSET = 31
+HEADER_END_OFFSET = -1
+
+changed = []
+invalid = []
+
+for file in sys.argv[1:]:
+    with open(file, "rt", encoding="utf-8", newline="\n") as f:
+        lines = f.readlines()
+
+    if len(lines) <= HEADER_BEGIN_OFFSET:
+        continue  # Most likely a dummy file.
+
+    if lines[HEADER_CHECK_OFFSET].startswith("#import"):
+        continue  # Early catch obj-c file.
+
+    name = f"GODOT_{Path(file).name}".upper().replace(".", "_").replace("-", "_").replace(" ", "_")
+
+    HEADER_CHECK = f"#ifndef {name}\n"
+    HEADER_BEGIN = f"#define {name}\n"
+    HEADER_END = f"#endif // {name}\n"
+
+    if (
+        lines[HEADER_CHECK_OFFSET] == HEADER_CHECK
+        and lines[HEADER_BEGIN_OFFSET] == HEADER_BEGIN
+        and lines[HEADER_END_OFFSET] == HEADER_END
+    ):
+        continue
+
+    # Guards might exist but with the wrong names.
+    if (
+        lines[HEADER_CHECK_OFFSET].startswith("#ifndef")
+        and lines[HEADER_BEGIN_OFFSET].startswith("#define")
+        and lines[HEADER_END_OFFSET].startswith("#endif")
+    ):
+        lines[HEADER_CHECK_OFFSET] = HEADER_CHECK
+        lines[HEADER_BEGIN_OFFSET] = HEADER_BEGIN
+        lines[HEADER_END_OFFSET] = HEADER_END
+        with open(file, "wt", encoding="utf-8", newline="\n") as f:
+            f.writelines(lines)
+        changed.append(file)
+        continue
+
+    header_check = -1
+    header_begin = -1
+    header_end = -1
+    pragma_once = -1
+    objc = False
+
+    for idx, line in enumerate(lines):
+        if not line.startswith("#"):
+            continue
+        elif line.startswith("#ifndef") and header_check == -1:
+            header_check = idx
+        elif line.startswith("#define") and header_begin == -1:
+            header_begin = idx
+        elif line.startswith("#endif") and header_end == -1:
+            header_end = idx
+        elif line.startswith("#pragma once"):
+            pragma_once = idx
+            break
+        elif line.startswith("#import"):
+            objc = True
+            break
+
+    if objc:
+        continue
+
+    if pragma_once != -1:
+        lines.pop(pragma_once)
+        lines.insert(HEADER_CHECK_OFFSET, HEADER_CHECK)
+        lines.insert(HEADER_BEGIN_OFFSET, HEADER_BEGIN)
+        lines.append("\n")
+        lines.append(HEADER_END)
+        with open(file, "wt", encoding="utf-8", newline="\n") as f:
+            f.writelines(lines)
+        changed.append(file)
+        continue
+
+    if header_check == -1 and header_begin == -1 and header_end == -1:
+        # Guards simply didn't exist
+        lines.insert(HEADER_CHECK_OFFSET, HEADER_CHECK)
+        lines.insert(HEADER_BEGIN_OFFSET, HEADER_BEGIN)
+        lines.append("\n")
+        lines.append(HEADER_END)
+        with open(file, "wt", encoding="utf-8", newline="\n") as f:
+            f.writelines(lines)
+        changed.append(file)
+        continue
+
+    if header_check != -1 and header_begin != -1 and header_end != -1:
+        # All prepends "found", see if we can salvage this.
+        if header_check == header_begin - 1 and header_begin < header_end:
+            lines.pop(header_check)
+            lines.pop(header_begin - 1)
+            lines.pop(header_end - 2)
+            if lines[header_end - 3] == "\n":
+                lines.pop(header_end - 3)
+            lines.insert(HEADER_CHECK_OFFSET, HEADER_CHECK)
+            lines.insert(HEADER_BEGIN_OFFSET, HEADER_BEGIN)
+            lines.append("\n")
+            lines.append(HEADER_END)
+            with open(file, "wt", encoding="utf-8", newline="\n") as f:
+                f.writelines(lines)
+            changed.append(file)
+            continue
+
+    invalid.append(file)
+
+if changed:
+    for file in changed:
+        print(f"FIXED: {file}")
+if invalid:
+    for file in invalid:
+        print(f"REQUIRES MANUAL CHANGES: {file}")
+    sys.exit(1)