code.delx.au - dotfiles/blob - .bash/functions

   1 #! bash
   2
   3 # Useful bash functions. This is sourced by the environment file.
   4 # These are available to scripts, but you shouldn't use them in scripts if you
   5 # want them to be portable.
   6
   7
   8 # Usage: pathremove /path/to/bin [PATH]
   9 # Eg, to remove ~/bin from $PATH
  10 #     pathremove ~/bin PATH
  11 function pathremove {
  12     local IFS=':'
  13     local NEWPATH
  14     local DIR
  15     local PATHVARIABLE=${2:-PATH}
  16     for DIR in ${!PATHVARIABLE} ; do
  17         if [ "${DIR}" != "${1}" ] ; then
  18             NEWPATH="${NEWPATH:+${NEWPATH}:}${DIR}"
  19         fi
  20     done
  21     export ${PATHVARIABLE}="${NEWPATH}"
  22 }
  23
  24 # Usage: pathprepend /path/to/bin [PATH]
  25 # Eg, to prepend ~/bin to $PATH
  26 #     pathprepend ~/bin PATH
  27 function pathprepend {
  28     pathremove "${1}" "${2}"
  29     [ -d "${1}" ] || return
  30     local PATHVARIABLE="${2:-PATH}"
  31     export ${PATHVARIABLE}="${1}${!PATHVARIABLE:+:${!PATHVARIABLE}}"
  32 }
  33
  34 # Usage: pathappend /path/to/bin [PATH]
  35 # Eg, to append ~/bin to $PATH
  36 #     pathappend ~/bin PATH
  37 function pathappend {
  38     pathremove "${1}" "${2}"
  39     [ -d "${1}" ] || return
  40     local PATHVARIABLE=${2:-PATH}
  41     export $PATHVARIABLE="${!PATHVARIABLE:+${!PATHVARIABLE}:}${1}"
  42 }
  43
  44 # Usage: is_function something
  45 # Check if a function exists
  46 function is_function {
  47     declare -Ff "$1" > /dev/null
  48 }
  49
  50 # Usage: find_up_recurse somefile
  51 # Check if a file named somefile exists in this directory or any parent
  52 function find_up_recurse {
  53     d="$1"
  54     pushd . > /dev/null
  55     while [ "$PWD" != "/" ]; do
  56         if [ -e "$d" ]; then
  57             popd > /dev/null
  58             return 0
  59         fi
  60         cd ..
  61     done
  62     popd > /dev/null
  63     return 1
  64 }
  65
  66 # Load local functions
  67 [ -r "${HOME}/.bash/functions_local" ] && source "${HOME}/.bash/functions_local"
  68