ci: Add uncrustify config and checker

Based on what we added to phoc recently

.gitlab-ci/check-style.py

@@ -0,0 +1,169 @@
+#!/bin/env python3
+#
+# Based on check-style.py by
+# Carlos Garnacho <carlosg@gnome.org>
+
+import argparse
+import os
+import re
+import subprocess
+import sys
+import tempfile
+
+# Path relative to this script
+uncrustify_cfg = '.gitlab-ci/uncrustify.cfg'
+
+
+def run_diff(sha):
+    proc = subprocess.run(
+        ["git", "diff", "-U0", "--function-context", sha, "HEAD"],
+        stdout=subprocess.PIPE,
+        stderr=subprocess.STDOUT,
+        encoding="utf-8",
+    )
+    return proc.stdout.strip().splitlines()
+
+
+def find_chunks(diff):
+    file_entry_re = re.compile(r'^\+\+\+ b/(.*)$')
+    diff_chunk_re = re.compile(r'^@@ -\d+,\d+ \+(\d+),(\d+)')
+    file = None
+    chunks = []
+
+    for line in diff:
+        match = file_entry_re.match(line)
+        if match:
+            file = match.group(1)
+
+        match = diff_chunk_re.match(line)
+        if match:
+            start = int(match.group(1))
+            len = int(match.group(2))
+            end = start + len
+
+            if len > 0 and (file.endswith('.c') or file.endswith('.h') or file.endswith('.vala')):
+                chunks.append({'file': file, 'start': start, 'end': end})
+
+    return chunks
+
+
+def reformat_chunks(chunks, rewrite, dry_run):
+    # Creates temp file with INDENT-ON/OFF comments
+    def create_temp_file(file, start, end):
+        with open(file) as f:
+            tmp = tempfile.NamedTemporaryFile()
+            if start > 1:
+                tmp.write(b'/** *INDENT-OFF* **/\n')
+            for i, line in enumerate(f, start=1):
+                if i == start - 1:
+                    tmp.write(b'/** *INDENT-ON* **/\n')
+
+                tmp.write(bytes(line, 'utf-8'))
+                if i == end - 1:
+                    tmp.write(b'/** *INDENT-OFF* **/\n')
+            tmp.seek(0)
+        return tmp
+
+    # Removes uncrustify INDENT-ON/OFF helper comments
+    def remove_indent_comments(output):
+        tmp = tempfile.NamedTemporaryFile()
+        for line in output:
+            if line != b'/** *INDENT-OFF* **/\n' and line != b'/** *INDENT-ON* **/\n':
+                tmp.write(line)
+
+        tmp.seek(0)
+        return tmp
+
+    changed = None
+    for chunk in chunks:
+        # Add INDENT-ON/OFF comments
+        tmp = create_temp_file(chunk['file'], chunk['start'], chunk['end'])
+
+        # uncrustify chunk
+        proc = subprocess.run(
+            ["uncrustify", "-c", uncrustify_cfg, "-f", tmp.name],
+            stdout=subprocess.PIPE,
+        )
+        reindented = proc.stdout.splitlines(keepends=True)
+        if proc.returncode != 0:
+            continue
+
+        tmp.close()
+
+        # Remove INDENT-ON/OFF comments
+        formatted = remove_indent_comments(reindented)
+
+        if dry_run is True:
+            # Show changes
+            proc = subprocess.run(
+                ["diff", "-up", "--color=always", chunk['file'], formatted.name],
+                stdout=subprocess.PIPE,
+                stderr=subprocess.STDOUT,
+                encoding="utf-8",
+            )
+            diff = proc.stdout
+            if diff != '':
+                output = re.sub('\t', '↦\t', diff)
+                print(output)
+                changed = True
+        else:
+            # Apply changes
+            diff = subprocess.run(
+                ["diff", "-up", chunk['file'], formatted.name],
+                stdout=subprocess.PIPE,
+                stderr=subprocess.STDOUT,
+            )
+            subprocess.run(["patch", chunk['file']], input=diff.stdout)
+
+        formatted.close()
+
+    return changed
+
+
+def main(argv):
+    parser = argparse.ArgumentParser(description='Check code style. Needs uncrustify installed.')
+    parser.add_argument('--sha', metavar='SHA', type=str,
+                        help='SHA for the commit to compare HEAD with')
+    parser.add_argument('--dry-run', '-d', type=bool,
+                        action=argparse.BooleanOptionalAction,
+                        help='Only print changes to stdout, do not change code')
+    parser.add_argument('--rewrite', '-r', type=bool,
+                        action=argparse.BooleanOptionalAction,
+                        help='Whether to amend the result to the last commit (e.g. \'git rebase --exec "%(prog)s -r"\')')
+
+    if not os.path.exists('.git'):
+        print("Not in toplevel of a git repository", fille=sys.stderr)
+        return 1
+
+    args = parser.parse_args(argv)
+    sha = args.sha or 'HEAD^'
+
+    diff = run_diff(sha)
+    chunks = find_chunks(diff)
+    changed = reformat_chunks(chunks, args.rewrite, args.dry_run)
+
+    if args.dry_run is not True and args.rewrite is True:
+        proc = subprocess.run(["git", "add", "-p"])
+        if proc.returncode == 0:
+            # Commit the added changes as a squash commit
+            subprocess.run(
+                ["git", "commit", "--squash", "HEAD", "-C", "HEAD"],
+                stdout=subprocess.DEVNULL)
+            # Delete the unapplied changes
+            subprocess.run(["git", "reset", "--hard"], stdout=subprocess.DEVNULL)
+            return 0
+    elif args.dry_run is True and changed is True:
+        print(f"""
+Issue the following commands in your local tree to apply the suggested changes:
+
+    $ git rebase {sha} --exec "./.gitlab-ci/check-style.py -r"
+    $ git rebase --autosquash {sha}
+
+Don't trust uncrustify unconditionally.
+""")
+        return 1
+    return 0
+
+
+if __name__ == '__main__':
+    sys.exit(main(sys.argv[1:]))

.gitlab-ci/uncrustify.cfg

@@ -0,0 +1,109 @@
+# Indent by two spaces
+indent_columns                  = 2
+# No tabs
+indent_with_tabs                = 0
+# Line length
+code_width                      = 100
+
+#
+# Keywords and operators
+#
+# Add between 'do' and '{'.
+sp_do_brace_open                = add
+# Add space between '}' and 'while'.
+sp_brace_close_while            = add
+# Add 'while' and '('.
+sp_while_paren_open             = add
+# Add or remove space around boolean operators '&&' and '||'.
+sp_bool                         = add
+# Ternary operator
+sp_cond_ternary_short           = remove
+# Remove newline between 'struct and '{'.
+nl_struct_brace                 = remove
+# Remove newline between 'if' and '{'.
+nl_if_brace                     = remove
+# Remove newline between '}' and 'else'.
+nl_brace_else                   = remove
+# Remove newline between 'else' and '{'.
+nl_else_brace                   = remove
+# Remove newline between 'else' and 'if'.
+nl_else_if                      = remove
+# Add or remove newline between 'for' and '{'.
+nl_for_brace                    = remove
+# Treat iterators as for loops:
+set FOR wl_list_for_each wl_list_for_each_reverse wl_list_for_each_safe
+
+#
+# Function declarations, defintions and calls
+#
+# Add space between function name and '(' on function declaration.
+sp_func_proto_paren             = add
+# Add or remove space between function name and '()' on function declaration
+# without parameters.
+sp_func_proto_paren_empty       = add
+# Add space between function name and '(' on function definition.
+sp_func_def_paren               = add
+# Add or remove space between function name and '(' on function calls.
+sp_func_call_paren              = add
+# Whether to force indentation of function definitions to start in column 1.
+indent_func_def_force_col1      = true
+# Add newline between return type and function name in a function definition.
+nl_func_type_name               = add
+# Add newline between function signature and '{'.
+nl_fdef_brace                   = add
+# Whether to align variable definitions in prototypes and functions.
+align_func_params               = true
+# The span for aligning function prototypes.
+align_func_proto_span           = 8
+# Add space between 'decltype(...)' and word.
+sp_after_decltype               = add
+# Add or remove space after a pointer star '*', if followed by a function
+# prototype or function definition.
+sp_after_ptr_star_func          = remove
+# Add or remove newline between a function call's ')' and '{', as in
+# 'list_for_each(item, &list) { }'.
+nl_fcall_brace                  = add
+
+#
+# Typedefs
+#
+# Add space between '}' and the name of a typedef on the same line.
+sp_brace_typedef                = add
+
+#
+# Comments
+#
+# Add space after the opening of a C++ comment, i.e. '// A' vs. '//A'.
+sp_cmt_cpp_start                = add
+
+#
+# Preprocessor
+#
+# Add or remove space between #else or #endif and a trailing comment.
+sp_endif_cmt                    = add
+
+# Newlines at the start and end of the file.
+nl_start_of_file                = remove
+nl_end_of_file                  = add
+nl_end_of_file_min              = 1
+
+#
+# Variable definitions
+#
+# How to align the '*' in variable definitions.
+#
+# 0: Part of the type     'void *   foo;' (default)
+# 1: Part of the variable 'void     *foo;'
+# 2: Dangling             'void    *foo;'
+# Dangling: the '*' will not be taken into account when aligning.
+align_var_def_star_style        = 2
+# Same for typedefs
+align_typedef_star_style        = 2
+# The gap for aligning struct/union member definitions.
+align_var_struct_gap            = 1
+# The span for aligning struct/union member definitions.
+align_var_struct_span           = 8
+# Remove space between pointer stars '*'.
+sp_between_ptr_star             = remove
+# Add space before '(' of control statements ('if', 'for', 'switch', 'while', etc.)
+sp_before_sparen                = add