#!/usr/bin/env sh

URL="https://github.com/kriszyp/cpm/tarball/master"

if [ -z "$CPM_INSTALL_LIB" ]; then
	CPM_INSTALL_LIB="/usr/local/lib"
fi
if [ ! -e "$CPM_INSTALL_LIB" ]; then
	CPM_INSTALL_LIB="/usr/lib"
fi
if [ -z "$CPM_INSTALL_BIN" ]; then
	CPM_INSTALL_BIN="/usr/local/bin"
fi
if [ ! -e "$CPM_INSTALL_BIN" ]; then
	CPM_INSTALL_BIN="/usr/bin"
fi

rm -rf "/tmp/cpm"
mkdir -p "/tmp/cpm/archive"

cd "/tmp/cpm"

curl -kL $URL > cpm.tar.gz

# ungzip and untar, stripping base directory and
# putting everything into "archive" directory
tar xzf cpm.tar.gz --strip-components=1 -C archive

if [ -e "$CPM_INSTALL_LIB/cpm" ]; then
	rm -rf "$CPM_INSTALL_LIB/cpm"
fi
mv -f "archive" "$CPM_INSTALL_LIB/cpm"

# if the file exists (whether it's an actual file or
# a symlink, remove it because `ln` won't replace it
if [ -e "$CPM_INSTALL_BIN/cpm" ]; then
	rm "$CPM_INSTALL_BIN/cpm"
fi

chmod +x "$CPM_INSTALL_LIB/cpm/cpm"
ln -fs "$CPM_INSTALL_LIB/cpm/cpm" "$CPM_INSTALL_BIN/cpm"