contib: add direnv implementation

contrib/direnv

@@ -0,0 +1,96 @@
+#!/usr/bin/env bash
+
+# Discover PRJ_ROOT if not found via git (i.e. not in a git repository).
+# Look for the .config folder in the current directory and up
+find_prj_config() (
+	local old_pwd
+	while [[ $old_pwd != "$PWD" ]]; do
+		if [[ -d .config && "$HOME" != "$PWD" ]]; then
+			echo "$PWD"
+			return 0
+		fi
+		old_pwd=$PWD
+		cd ..
+	done
+	# We're at the top and didn't find anything
+	log_error "ERROR: could not find project root" >&2
+	return 1
+)
+
+# Discover PRJ_ROOT if in a git repository.
+find_prj_root_with_git() (
+	git rev-parse --show-toplevel 2>/dev/null
+)
+
+{
+	: "${XDG_CONFIG_HOME:=${HOME}/.config}"
+	: "${XDG_CACHE_HOME:=${HOME}/.cache}"
+	: "${XDG_DATA_HOME:=${HOME}/.local/share}"
+
+	# PRJ_ROOT
+	_prj_root="$(find_prj_root_with_git)"
+	: "${PRJ_ROOT:=${_prj_root:=$(find_prj_config)}}"
+
+	# PRJ_CONFIG_HOME - always local to the project
+	: "${PRJ_CONFIG_HOME:=${PRJ_ROOT}/.config}"
+	mkdir -p "${PRJ_CONFIG_HOME}"
+
+	if [[ -z "${PRJ_ID:-}" && -f "${PRJ_CONFIG_HOME}/prj_id" ]]; then
+		PRJ_ID=$(<"${PRJ_CONFIG_HOME}/prj_id")
+	fi
+
+	# PRJ_RUNTIME_DIR - always local to the project
+	: "${PRJ_RUNTIME_DIR:=${PRJ_ROOT}/.run}"
+	mkdir -p "${PRJ_RUNTIME_DIR}"
+
+	# PRJ_CACHE_HOME - shared if PRJ_ID is set
+	if [[ -z "${PRJ_CACHE_HOME:-}" ]]; then
+		if [[ -n "${PRJ_ID:-}" ]]; then
+			PRJ_CACHE_HOME="${XDG_CACHE_HOME}/prj/${PRJ_ID}"
+		else
+			PRJ_CACHE_HOME="${PRJ_ROOT}/.cache"
+		fi
+	fi
+	mkdir -p "${PRJ_CACHE_HOME}"
+
+	# PRJ_DATA_HOME - shared if PRJ_ID is set
+	if [[ -z "${PRJ_DATA_HOME:-}" ]]; then
+		if [[ -n "${PRJ_ID:-}" ]]; then
+			PRJ_DATA_HOME="${XDG_DATA_HOME}/prj/${PRJ_ID}"
+		else
+			PRJ_DATA_HOME="${PRJ_ROOT}/.data"
+		fi
+	fi
+	mkdir -p "${PRJ_DATA_HOME}"
+
+	# PRJ_PATH - shared if PRJ_ID is set
+	if [[ -z "${PRJ_PATH:-}" ]]; then
+		if [[ -n "${PRJ_ID:-}" ]]; then
+			PRJ_PATH="${HOME}/.local/bin/prj/${PRJ_ID}"
+		else
+			PRJ_PATH="${PRJ_ROOT}/.bin"
+		fi
+	fi
+	mkdir -p "${PRJ_PATH}"
+}
+
+unset -f find_prj_config
+
+PATH_add "${PRJ_PATH}"
+export PRJ_ROOT
+export PRJ_ID
+export PRJ_PATH
+export PRJ_CONFIG_HOME
+export PRJ_CACHE_HOME
+export PRJ_DATA_HOME
+export PRJ_RUNTIME_DIR
+[ -z ${DIRENV_PRJ_SILENCE+x} ] && log_status "PRJ_ROOT:        ${PRJ_ROOT}"
+[ -z ${DIRENV_PRJ_SILENCE+x} ] && log_status "PRJ_ID:          ${PRJ_ID-none}"
+[ -z ${DIRENV_PRJ_SILENCE+x} ] && log_status "PRJ_CONFIG_HOME: ${PRJ_CONFIG_HOME#"${PRJ_ROOT}"/}"
+[ -z ${DIRENV_PRJ_SILENCE+x} ] && log_status "PRJ_RUNTIME_DIR: ${PRJ_RUNTIME_DIR#"${PRJ_ROOT}"/}"
+[ -z ${DIRENV_PRJ_SILENCE+x} ] && log_status "PRJ_CACHE_HOME:  ${PRJ_CACHE_HOME#"${PRJ_ROOT}"/}"
+[ -z ${DIRENV_PRJ_SILENCE+x} ] && log_status "PRJ_DATA_HOME:   ${PRJ_DATA_HOME#"${PRJ_ROOT}"/}"
+[ -z ${DIRENV_PRJ_SILENCE+x} ] && log_status "PRJ_PATH:        ${PRJ_PATH#"${PRJ_ROOT}"/}"
+
+# shellcheck disable=SC2034
+direnv_layout_dir="${PRJ_DATA_HOME}/direnv"