Index code with glimpse, ctags, and cscope. Store the indexes and such in a defined cache directory, which may live on a fast SSD

indexcode

#!/usr/bin/env bash
# Original credit to tecknicaltom@neg9.org for creating this script and concept - thanks!

# Store indexes and such in a cache located on an SSD, and symlink to them
# Ensure the cache location is at the same or better security level (encrypted drive) as the data you are indexing.
cache_root="${HOME}/.indexcodecache"
cur_proj="$(basename -a ${PWD} | tr -d '\n')-$(echo ${PWD} | shasum -a 512 | cut -c 1-16)"
cache_dir="${cache_root}/${cur_proj}"

# Set umask to create files as mode 0600 (user r/w, go none)
umask 0077 || (echo "[ERROR] Setting restrictive umask (0077), aborting."; exit 1)

if [ -d "$cache_dir" ]; then
	echo "[Info] Cache directory exists: ${cache_dir}"
else
	echo "[Info] Creating cache directory: ${cache_dir}"
	mkdir -p "$cache_dir" || (echo "[ERROR] Failed to create cache dir, aborting."; exit 1)
fi

# Make destination directories as needed and create symlinks locally
ln -sf "${cache_dir}/tags" "${PWD}/tags"

mkdir -p "${cache_dir}/glimpse"
ln -sf "${cache_dir}/glimpse" "${PWD}/.glimpse"
ln -sf "${cache_dir}/cscope.files" "${PWD}/cscope.files"
# The cscope utility deletes its database files if they exist, so we have to move + symlink them vs create links before

ctags .

cat <<- EOF > .glimpse/.glimpse_exclude
	*/tags
	.svn
	YASAT
	.glimpse
	doxygen
	.git
EOF

LC_ALL=C glimpseindex -M 64 -B -f -n -H .glimpse/ .

# cscope
find .  -type f \
	-and \
	 \( -iname '*.py' \
	-or -iname '*.java' \
	-or -iname '*.[ch]' \
	-or -iname '*.cpp' \
	-or -iname '*.cc' \
	-or -iname '*.hpp' \
	-or -iname '*.l' \
	-or -iname '*.y' \) \
	-and -exec echo '"{}"' ';' \
> "cscope.files"

if [ -s "cscope.files" ]; then
	# -b: just build
	# -q: create inverted index
	cscope -b -q || (echo "[ERROR] Failed to execute cscope -b -q \"cscope.files\", aborting."; exit 1)

	# The cscope utility deletes its database files if they exist, so we have to move + symlink them vs create links before
	mv "${PWD}/cscope.out" "${PWD}/cscope.in.out" "${PWD}/cscope.po.out" "${cache_dir}/"
	ln -sf "${cache_dir}/cscope.in.out" "${PWD}/cscope.in.out"
	ln -sf "${cache_dir}/cscope.out" "${PWD}/cscope.out"
	ln -sf "${cache_dir}/cscope.po.out" "${PWD}/cscope.po.out"
else
	echo "[Info] No cscope.files content, not running cscope."
	rm -f "cscope.files"
fi