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Add function to print the version of commands #22

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merged 2 commits into from Oct 24, 2018
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Add function to print the version of commands #22

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82c3d13
Add function to print the version of commands
antevens Oct 16, 2018
5b88f96
Fix error message handling for print_version
antevens Oct 18, 2018
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17 changes: 17 additions & 0 deletions shtdlib.sh
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Expand Up @@ -347,6 +347,23 @@ function compare_versions {
return $(( lowest_ver_line-1 ))
}

# Prints the version of a command, accepts 1-4 parameters
# 1. Full or relative path to command (required)
# 2. Text to display before version info (optional)
# 3. Flag/Argument to command to get version (optional, defaults to --version)
# 4. Error message if command is not found, to ignore redirect stderr like
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# this: print_version bash 2> /dev/null
function print_version {
local error_msg
error_msg="${4:-Unable to find command ${1}}"
if command -v "${1}" > /dev/null ; then
echo "${2:-}"
${1} "${3:---version}"
else
(>&2 echo "${error_msg}")
fi
}

# Converts relative paths to full paths, ignores invalid paths
# Accepts either the path or name of a variable holding the path
function finalize_path {
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