#!/bin/sh

# Build cgit for development and debugging. It compiles without optimisation
# and with full debug information, holds the sources to git's DEVELOPER
# warnings, and links in AddressSanitizer and UndefinedBehaviorSanitizer, so a
# memory error or undefined behaviour stops the program where it happens. With
# clang it also leaves a compilation database in build/compile_commands.json,
# where a language server looks for one, and with ctags a tags file in
# build/tags. The sanitizers make cgit slow, so the result is for testing and
# debugging rather than serving.
#
# Any arguments go on to make, the way Lua flags do where pkg-config cannot
# find Lua:
#
#     ./tools/build-development.sh LUA_PKGCONFIG=luajit
#
# Going back to a normal build takes make cleanall first.

set -eu

# Every make target below is written relative to the repository root.
cd "$(dirname "$0")/.."

# The build starts from clean so the bundled git objects pick up the same
# flags, and cleanall rather than clean because only cleanall descends into
# vendor/git.
make cleanall
make "$@" CFLAGS="-O0 -g3" DEVELOPER=1 SANITIZE=address,undefined \
	GENERATE_COMPILATION_DATABASE=yes

# clang writes one entry per object under vendor/git/compile_commands, each
# ending in a comma, so they are joined into one array. cgit's are named after
# ../../build, which a shell glob would pass over as hidden.
if test -d vendor/git/compile_commands
then
	find vendor/git/compile_commands -name '*.json' -exec cat {} + |
		sed -e '1s/^/[/' -e '$s/,$/]/' >build/compile_commands.json
	test -s build/compile_commands.json || rm -f build/compile_commands.json
fi

if command -v ctags >/dev/null
then
	make tags
fi