1 files changed, 145 insertions, 0 deletions
diff --git a/build-aux/lint-src b/build-aux/lint-src
new file mode 100755
index 0000000..033340d
--- /dev/null
+++ b/build-aux/lint-src
@@ -0,0 +1,145 @@
+#!/usr/bin/env bash
+# build-aux/lint-src - Lint checks for source files
+#
+# Copyright (C) 2024-2025  Luke T. Shumaker <lukeshu@lukeshu.com>
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+RED=$(tput setaf 1)
+RESET=$(tput sgr0)
+
+err() {
+	printf "${RED}%s${RESET}: %s\n" "$1" "$2" >&2
+	r=1
+}
+
+get-dscname() {
+	if [[ $1 == */Documentation/* ]] && [[ "$(sed 1q -- "$1")" == 'NAME' ]]; then
+		sed -n '
+			2{
+				s,[/.],_,g;
+				s,^\s*_,Documentation/,;
+				s,$,.txt,;
+
+				p;
+				q;
+			}
+			' -- "$1"
+	else
+		sed -n '
+			1,3{
+				/^\#!/d;
+				/^<!--$/d;
+				/-\*- .* -\*-/d;
+				s,[/*\# ]*,,;
+				s/ - .*//;
+
+				p;
+				q;
+			}
+			' -- "$1"
+	fi
+}
+
+{
+	filetype=$1
+	filenames=("${@:2}")
+
+	r=0
+	for filename in "${filenames[@]}"; do
+		# File header ##########################################################
+
+		shebang="$(sed -n '1{/^#!/p;}' "$filename")"
+		if [[ -x $filename && (-z $shebang || $shebang == '#!/hint/'*) ]]; then
+			err "$filename" 'is executable but does not have a shebang'
+		elif [[ (-n $shebang && $shebang != '#!/hint/'*) && ! -x $filename ]]; then
+			err "$filename" 'has a shebang but is not executable'
+		fi
+		case "$shebang" in
+			'') : ;;
+			'#!/bin/sh') : ;;
+			'#!/usr/bin/env bash') : ;;
+			'#!/usr/bin/env python3') : ;;
+			*) err "$filename" 'has an unrecognized shebang' ;;
+		esac
+		if [[ -n $shebang && $shebang != */"$filetype" && $shebang != *' '"$filetype" ]]; then
+			err "$filename" "wrong shebang for $filetype"
+		fi
+
+		if ! grep -E -q 'Copyright \(C\) 202[4-9]((-|, )202[5-9])*  Luke T. Shumaker' "$filename"; then
+			err "$filename" 'is missing a copyright statement'
+		fi
+		if test -e .git && ! git diff --quiet milestone/2025-01-01 HEAD -- "$filename"; then
+			if ! grep -E -q 'Copyright \(C\) .*2025  Luke T. Shumaker' "$filename"; then
+				err "$filename" 'has an outdated copyright statement'
+			fi
+		fi
+		if ! grep -q '\sSPDX-License-Identifier[:] ' "$filename"; then
+			err "$filename" 'is missing an SPDX-License-Identifier'
+		fi
+
+		dscname_act=$(get-dscname "$filename")
+		dscname_exp=$(echo "$filename" | sed \
+			-e 's,.*/config/,,' \
+			-e 's,.*/config\.h$,config.h,' \
+			-e 's,.*include/,,' \
+			-e 's,.*static/,,' \
+			-e 's/\.wip$//')
+		if [ "$dscname_act" != "$dscname_exp" ] && [ "cmd/$dscname_act" != "$dscname_exp" ]; then
+			err "$filename" "self-identifies as $dscname_act (expected $dscname_exp)"
+		fi
+
+		# File body ############################################################
+
+		if grep -n --color=auto "$(printf '\\S\t')" "$filename"; then
+			err "$filename" 'uses tabs for alignment'
+		fi
+	done
+	case "$filetype" in
+		unknown)
+			for filename in "${filenames[@]}"; do
+				err "$filename" 'cannot lint unknown file type'
+			done
+			;;
+		c)
+			for filename in "${filenames[@]}"; do
+				if [[ $filename == *.h ]]; then
+					dscname=$(get-dscname "$filename")
+					guard=${dscname//'/'/'_'}
+					guard=${guard//'.'/'_'}
+					guard="_${guard^^}_"
+					if ! { grep -Fxq "#ifndef ${guard}" "$filename" &&
+						grep -Fxq "#define ${guard}" "$filename" &&
+						grep -Fxq "#endif /* ${guard} */" "$filename"; }; then
+						err "$filename" "does not have ${guard} guard"
+					fi
+				fi
+			done
+			;;
+		sh | bash)
+			shellcheck "${filenames[@]}" || exit $?
+			shfmt --diff --case-indent --simplify "${filenames[@]}" || exit $?
+			;;
+		python3)
+			./build-aux/venv/bin/mypy --strict --scripts-are-modules "${filenames[@]}" || exit $?
+			./build-aux/venv/bin/black --check "${filenames[@]}" || exit $?
+			./build-aux/venv/bin/isort --check "${filenames[@]}" || exit $?
+			./build-aux/venv/bin/pylint "${filenames[@]}" || exit $?
+			if grep -nh 'SPECIAL$$' -- lib9p/core.gen lib9p/core_gen/*.py; then exit 1; fi
+			testfiles=()
+			for filename in "${filenames[@]}"; do
+				if [[ ${filename##*/} == test_*.py ]]; then
+					testfiles+=("$filename")
+				fi
+			done
+			./build-aux/venv/bin/pytest "${testfiles[@]}" || exit $?
+			;;
+		make | cmake | gitignore | ini | 9p-idl | 9p-log | markdown | pip | man-cat)
+			# TODO: Write/adopt linters for these file types
+			:
+			;;
+		*)
+			err "$0" "unknown filetype: ${filetype}"
+			;;
+	esac
+	exit $r
+}