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Bash-Snippets/skeleton

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#!/usr/bin/env bash
# Author: Alexander Epstein https://github.com/alexanderepstein
2017-08-04 14:26:44 +02:00
currentVersion="1.18.0"
configuredClient=""
## This function determines which http get tool the system has installed and returns an error if there isnt one
getConfiguredClient()
{
if command -v curl &>/dev/null; then
configuredClient="curl"
elif command -v wget &>/dev/null; then
configuredClient="wget"
elif command -v http &>/dev/null; then
configuredClient="httpie"
elif command -v fetch &>/dev/null; then
configuredClient="fetch"
else
echo "Error: This tool reqires either curl, wget, httpie or fetch to be installed." >&2
return 1
fi
}
## Allows to call the users configured client without if statements everywhere
httpGet()
{
case "$configuredClient" in
curl) curl -A curl -s "$@" ;;
wget) wget -qO- "$@" ;;
httpie) http -b GET "$@" ;;
fetch) fetch -q "$@" ;;
esac
}
update()
{
# Author: Alexander Epstein https://github.com/alexanderepstein
# Update utility version 1.2.0
# To test the tool enter in the defualt values that are in the examples for each variable
repositoryName="Bash-Snippets" #Name of repostiory to be updated ex. Sandman-Lite
githubUserName="alexanderepstein" #username that hosts the repostiory ex. alexanderepstein
nameOfInstallFile="install.sh" # change this if the installer file has a different name be sure to include file extension if there is one
latestVersion=$(httpGet https://api.github.com/repos/$githubUserName/$repositoryName/tags | grep -Eo '"name":.*?[^\\]",'| head -1 | grep -Eo "[0-9.]+" ) #always grabs the tag without the v option
if [[ $currentVersion == "" || $repositoryName == "" || $githubUserName == "" || $nameOfInstallFile == "" ]]; then
echo "Error: update utility has not been configured correctly." >&2
exit 1
elif [[ $latestVersion == "" ]]; then
echo "Error: no active internet connection" >&2
exit 1
else
if [[ "$latestVersion" != "$currentVersion" ]]; then
echo "Version $latestVersion available"
echo -n "Do you wish to update $repositoryName [Y/n]: "
read -r answer
if [[ "$answer" == [Yy] ]]; then
cd ~ || { echo 'Update Failed'; exit 1; }
if [[ -d ~/$repositoryName ]]; then rm -r -f $repositoryName || { echo "Permissions Error: try running the update as sudo"; exit 1; } ; fi
git clone "https://github.com/$githubUserName/$repositoryName" || { echo "Couldn't download latest version"; exit 1; }
cd $repositoryName || { echo 'Update Failed'; exit 1; }
git checkout "v$latestVersion" 2> /dev/null || git checkout "$latestVersion" 2> /dev/null || echo "Couldn't git checkout to stable release, updating to latest commit."
chmod a+x install.sh #this might be necessary in your case but wasnt in mine.
./$nameOfInstallFile "update" || exit 1
cd ..
rm -r -f $repositoryName || { echo "Permissions Error: update succesfull but cannot delete temp files located at ~/$repositoryName delete this directory with sudo"; exit 1; }
else
exit 1
fi
else
echo "$repositoryName is already the latest version"
fi
fi
}
checkInternet()
{
httpGet github.com > /dev/null 2>&1 || { echo "Error: no active internet connection" >&2; return 1; } # query github with a get request
}
usage()
{
cat <<EOF
Skeleton
Description: Short desciption of the tool.
Usage: tool [flags] or tool [flags] [arguments]
-u Update Bash-Snippet Tools
-h Show the help
-v Get the tool version
Examples:
tool
tool
EOF
}
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getConfiguredClient || exit 1
while getopts "uvh" opt; do
case "$opt" in
\?) echo "Invalid option: -$OPTARG" >&2
exit 1
;;
h) usage
exit 0
;;
v) echo "Version $currentVersion"
exit 0
;;
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u) checkInternet || exit 1
update
exit 0
;;
:) echo "Option -$OPTARG requires an argument." >&2
exit 1
;;
esac
done
# special set of first arguments that have a specific behavior across tools
if [[ $# == "0" ]]; then
usage ## if calling the tool with no flags and args chances are you want to return usage
exit 0
elif [[ $# == "1" ]]; then
if [[ $1 == "update" ]]; then
checkInternet || exit 1
update || exit 1
exit 0
elif [[ $1 == "help" ]]; then
usage
exit 0
fi
fi
## The rest of the conditions and code would go here
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## Make sure to use checkInternet at least once before any time httpGet will be called.