annotate .shell.d/00.path_manipulation.sh @ 307:e37b00236907

zshrc: work around my shell function that turns on utf8 in screen The zsh built in which was getting confused by the function, and always claimed screen was installed. I'm finally running into machines with tmux but not screen, so I noticed.
author Augie Fackler <raf@durin42.com>
date Sat, 19 Jan 2013 19:29:58 -0600
parents 7dfb7799567f
children c85072e620a8
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1 # Functions for manipulating $PATH. Split out so I can use them in .zshenv if I want.
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3 function insert_path_element() {
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4 insert_element_into_var $1 PATH
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5 }
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7 function remove_path_element() {
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8 remove_element_from_var $1 PATH
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9 }
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11 function insert_element_into_var () {
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12 eval varcontents=\$"$2"
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13 eval varname="$2"
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14 newcomp="$1"
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15 if echo "$varcontents" | grep "$newcomp:" >> /dev/null; then
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16 true
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17 elif [[ "$varcontents" == "" ]] ; then
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18 export $varname="$newcomp"
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19 else
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20 export $varname="$newcomp:$varcontents"
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21 fi
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22 }
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23
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24 function remove_element_from_var() {
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25 eval varcontents=\$"$2"
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26 eval varname="$2"
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27 newcomp="$1"
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28 if echo "$varcontents" | grep "$newcomp:" >> /dev/null; then
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29 export $varname="`echo $varcontents | sed s%$newcomp:%%`"
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30 elif [[ "$varcontents" == "$newcomp" ]] ; then
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31 unset $varname
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32 else
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33 echo $1 not in $varname
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34 fi
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35 }