Skip to content

Instantly share code, notes, and snippets.

@hoshang82
Forked from JamieMason/is_installed.sh
Created April 9, 2018 07:31
Show Gist options
  • Save hoshang82/ebf3f573cccaef6dd280d3cadb94e90a to your computer and use it in GitHub Desktop.
Save hoshang82/ebf3f573cccaef6dd280d3cadb94e90a to your computer and use it in GitHub Desktop.
Check if a program exists from a bash script.Thanks to twitter.com/joshnesbitt and twitter.com/mheap for the help with detecting npm packages.
#!/bin/bash
# Functions ==============================================
# return 1 if global command line program installed, else 0
# example
# echo "node: $(program_is_installed node)"
function program_is_installed {
# set to 1 initially
local return_=1
# set to 0 if not found
type $1 >/dev/null 2>&1 || { local return_=0; }
# return value
echo "$return_"
}
# return 1 if local npm package is installed at ./node_modules, else 0
# example
# echo "gruntacular : $(npm_package_is_installed gruntacular)"
function npm_package_is_installed {
# set to 1 initially
local return_=1
# set to 0 if not found
ls node_modules | grep $1 >/dev/null 2>&1 || { local return_=0; }
# return value
echo "$return_"
}
# display a message in red with a cross by it
# example
# echo echo_fail "No"
function echo_fail {
# echo first argument in red
printf "\e[31m✘ ${1}"
# reset colours back to normal
printf "\033\e[0m"
}
# display a message in green with a tick by it
# example
# echo echo_fail "Yes"
function echo_pass {
# echo first argument in green
printf "\e[32m✔ ${1}"
# reset colours back to normal
printf "\033\e[0m"
}
# echo pass or fail
# example
# echo echo_if 1 "Passed"
# echo echo_if 0 "Failed"
function echo_if {
if [ $1 == 1 ]; then
echo_pass $2
else
echo_fail $2
fi
}
# ============================================== Functions
# command line programs
echo "node $(echo_if $(program_is_installed node))"
echo "gulp $(echo_if $(program_is_installed gulp))"
echo "webpack $(echo_if $(program_is_installed webpack))"
echo "eslint $(echo_if $(program_is_installed eslint))"
echo "tsc $(echo_if $(program_is_installed tsc))"
echo "brew $(echo_if $(program_is_installed brew))"
echo "gem $(echo_if $(program_is_installed gem))"
# local npm packages
echo "lodash $(echo_if $(npm_package_is_installed lodash))"
echo "react $(echo_if $(npm_package_is_installed react))"
echo "angular $(echo_if $(npm_package_is_installed angular))"
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment