maybe-install-bash-lib

#!/bin/bash
# maybe-install-bash-lib LIBS ..
#
# This utility can be used with other bash libraries that depend on bash-lib,
# as part of their own installation procuedure, to ensure that the bash-lib is
# installed.
#
# LIBS can be any of the files intalled as part of the bash-lib set.
#
# The file name can be given with, or without the ".sh" suffix, and with, or
# withou the leading directory.  For example, as "sh-utils", "sh-utils.sh", or
# "$HOME/lib/sh-utils.sh"

talk(){ echo 1>&2 "$*" ; }

install_bash_lib() {
  tmpdir=/tmp/bash-lib.$$
  logdir=$tmpdir.log
  local status
  talk "Installing github.com/aks/bash-lib .."
  if ( set -x 
         mkdir $tmpdir
         cd $tmpdir
         git clone https://github.com/aks/bash-lib.git
         cd ./bash-lib
         make install
     ) &> $logdir ; then
    talk "github.com/aks/bash-lib installed"
    status=0
  else
    status=$?
    talk "An error occurred installing bash-lib."
  fi
  talk "See $logdir for details."
  exit $status
}

# if file_paths_missing $PATH ; then
#   install-files
# fi
#
# Return success (0) if PATH needs to be installed

file_paths_missing() {
  local file prog
  for prog in $@ ; do
    case "$prog" in
      /*.sh) file="$prog" ;;
      /*)    file="$prog.sh" ;;
      *.sh)  file="$HOME/lib/$prog" ;;
      *)     file="$HOME/lib/$prog.sh" ;;
    esac
    if [[ ! -f $file ]]; then
      return 0
    fi
  done
  return 1
}

if (( $# > 0 )); then
  libs="$*"
else
  libs="sh-utils list-utils"
fi

if file_paths_missing $libs ; then
  install_bash_lib
fi

exit 0