Quickly `cd` to an OSGi module

gm.bash

# Running this will display a filterable list of modules
# Once you select one, you will navigate to it
# You can call it with an argument to be used as a pre-filter on the module list

# Requires 'fzf', I highly recommend it.
# https://github.com/junegunn/fzf
# In this case, 'fzf' is reading from stdin

# USAGE EXAMPLES
# gm              (will present the full list of modules)
# gm segments     (will present a list of modules pre-filtered by "segments")

function gm() {
	# The optional filter pattern. If none is given, all modules will be shown
	local PATTERN
	PATTERN="$*"

	# Find the root of the Git project
	local PROJECT_ROOT
	PROJECT_ROOT="$(git rev-parse --show-toplevel)"

	# Get the module path
	local MODULE_PATH
	MODULE_PATH="$(
		# Exclude any files that are inside a 'src' folder since we only want module roots
		# Exclude any files that are inside a 'samples' folder since those are probably not true sources

		# List all *.bnd files from project root
		# List all *build.xml files from project root
		# List all *pom.xml files from project root
		git -C "${PROJECT_ROOT}" ls-files -- \
			':!:**/src/**' \
			':!:**/samples/**' \
			\
			'*.bnd' \
			'*build.xml' \
			'*pom.xml' \
			|

		# Strip the filename, leaving just the directory name
		# 	This is WAY faster than using "dirname"
		#
		# Strip the trailing forward-slash
		# Delete any empty lines
		sed -E \
			-e 's,[^/]*$,,g' \
			\
			-e 's,/$,,g' \
			-e '/^$/d' \
			|

		# Gets rid of any duplicates in case a module has more than one *.bnd file
		uniq |

		# Pass the results to 'fzf' so the user can choose. Also passes the pattern as a default query.
		fzf \
			--exit-0 \
			--no-multi \
			--query "${PATTERN}" \
			--select-1 \
			;
	)"

	# If you actually chose a module path, navigate to it. Otherwise do nothing.
	if [ -n "${MODULE_PATH}" ]
	then
		cd "${PROJECT_ROOT}/${MODULE_PATH}" || return 1
	fi
}