From 3a07654752375085a88c9585d5e247a8d16dfc44 Mon Sep 17 00:00:00 2001
From: Jean Privat <jean@pryen.org>
Date: Thu, 22 Oct 2015 10:53:09 -0400
Subject: [PATCH] misc: add `nit_env.sh` to auto-magically configure shell
 environements

Signed-off-by: Jean Privat <jean@pryen.org>
---
 misc/nit_env.sh |  126 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 126 insertions(+)
 create mode 100644 misc/nit_env.sh

diff --git a/misc/nit_env.sh b/misc/nit_env.sh
new file mode 100644
index 0000000..d0c1c0a
--- /dev/null
+++ b/misc/nit_env.sh
@@ -0,0 +1,126 @@
+# This file is part of NIT ( http://www.nitlanguage.org ).
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Source this script inside a bash or sh session to setup:
+#
+# * PATH
+# * MANPATH
+# * bash_completion
+#
+# If `install` is given as an argument, then the script sourcing is automatically inserted in the `.profile`.
+
+# Final function that sets up the shell environment.
+__nit_env() {
+	#echo "Install in $1:"
+
+	local str="$1/bin"
+	echo "$PATH" | grep -q "$str" || export PATH="$str:$PATH"
+	str="$1/share/bin"
+	echo "$MANPATH" | grep -q "$str" || export MANPATH="$str:$MANPATH"
+
+	if [ -n "$BASH" -a -n "$PS1" ]; then
+		. "$1/misc/bash_completion/nit"
+	fi
+
+}
+
+# Fast setup when invoked from .profile (see `install` at the end)
+#
+# Because [d]ash does not support argument to source (`.`),
+# we pass the root dir as a local environment variable.
+if [ -n "$NIT_DIR" ]; then
+	__nit_env "$NIT_DIR"
+	return 2> /dev/null # `return` fails if invoked as is; i.e. not trough source (`.`)
+	exit
+fi
+
+# Guess the nit root directory and return it in `dirname`.
+__nit_env_guess() {
+	dirname=$NIT_DIR
+	[ -f "$dirname/src/nitc.nit" ] && return 0
+
+	dirname=$PWD
+	[ -f "$dirname/src/nitc.nit" ] && return 0
+
+	if [ -n "$BASH_SOURCE" ]; then
+		dirname=`dirname "$BASH_SOURCE"`/..
+		[ -f "$dirname/src/nitc.nit" ] && return 0
+	fi
+
+	dirname=`dirname "$0"`/..
+	[ -f "$dirname/src/nitc.nit" ] && return 0
+
+	echo "Cannot find the Nit root directory. Run the script from the Nit root directory."
+	return 1
+}
+
+# Main method of the script.
+#
+# A function is used so that `return` have a sane effect
+__nit_env_main() {
+	local install
+	local dirname
+
+	# Install required?
+	if [ "$1" = "install" ]; then
+		install=true
+		shift
+	fi
+
+	# Get the root directory
+	case "$#" in
+		1)
+			# Get it from the argument
+			dirname=$1
+			if [ ! -f "$dirname/src/nitc.nit" ]; then
+				if [ -d "$dirname/" ]; then
+					echo "$dirname: not a Nit root directory"
+				else
+					echo "$dirname: not a directory"
+				fi
+				return 1
+			fi
+			;;
+		0)
+			# Guess it
+			__nit_env_guess || return 1
+			;;
+		*) echo "usage: source nit_env.sh [install] [path/to/nitdir]"
+			return 1
+			;;
+	esac
+
+	# Get a canonical path
+	local ret=`pwd`
+	cd $dirname > /dev/null
+	local fulldir=`pwd`
+	cd "$ret"
+
+	# Check misuse
+	if [ -n "$BASH" -a "$0" = "$BASH_SOURCE" ]; then
+		echo "nit_env.sh should be sourced not executed as is. E.g. run with 'source ./nit_env.sh'"
+	fi
+
+	# Setup the environment
+	__nit_env "$fulldir"
+
+	# Register in the .profile if required
+	if [ -n "$install" ]; then
+		local ne="$fulldir/misc/nit_env.sh"
+		local str="test -r \"$ne\" && NIT_DIR=\"$fulldir\" . \"$ne\""
+		grep -q "$str" "$HOME/.profile" || echo "$str" >> "$HOME/.profile"
+	fi
+}
+
+__nit_env_main "$@"
-- 
1.7.9.5