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: ssource /path/to/shellscript
  45 # Checks if the file exists before sourcing it
  46 function ssource {
  47         [ -r "${1}" ] && source "${1}"
  48 }
  49
  50 # Usage: is_function something
  51 # Check if a function exists
  52 function is_function {
  53         declare -Ff "$1" > /dev/null
  54 }
  55
  56 # Usage: find_up_recurse somefile
  57 # Check if a file named somefile exists in this directory or any parent
  58 function find_up_recurse {
  59         d="$1"
  60         pushd . > /dev/null
  61         while [ "$PWD" != "/" ]; do
  62                 if [ -e "$d" ]; then
  63                         popd > /dev/null
  64                         return 0
  65                 fi
  66                 cd ..
  67         done
  68         popd > /dev/null
  69         return 1
  70 }
  71
  72 # Load local functions
  73 ssource "${HOME}/.bash/functions_local"
  74