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https://github.com/ohmyzsh/ohmyzsh.git
synced 2024-09-20 15:55:32 +00:00
8d814fdff6
This version tries whether grep supports all the flags together and progressively checks older flags if the grep test fails. This means only one grep call if all flags are supported, and one additional call for every flag that's not supported, up to a maximum of 3 calls.
40 lines
1.2 KiB
Bash
40 lines
1.2 KiB
Bash
# see if we already cached the grep alias in past day
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_grep_alias_cache=("$ZSH_CACHE_DIR"/grep_alias.zsh(Nm-24))
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if (( $#_grep_alias_cache )); then
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source "$ZSH_CACHE_DIR"/grep_alias.zsh
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else
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# is x grep argument available?
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grep-flags-available() {
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echo | grep "$@" "" >/dev/null 2>&1
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}
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GREP_OPTIONS=""
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# ignore these folders (if the necessary grep flags are available)
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EXC_FOLDERS="{.bzr,CVS,.git,.hg,.svn,.idea,.tox}"
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if grep-flags-available --color=auto --exclude-dir=.cvs; then
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GREP_OPTIONS+="--color=auto --exclude-dir=$EXC_FOLDERS"
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elif grep-flags-available --color=auto --exclude=.cvs; then
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GREP_OPTIONS+="--color=auto --exclude=$EXC_FOLDERS"
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elif grep-flags-available --color=auto; then
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GREP_OPTIONS+="--color=auto"
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fi
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{
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if [[ -n "$GREP_OPTIONS" ]]; then
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# export grep, egrep and fgrep settings
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echo alias grep="'grep $GREP_OPTIONS'"
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echo alias egrep="'egrep $GREP_OPTIONS'"
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echo alias fgrep="'fgrep $GREP_OPTIONS'"
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fi
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} > "$ZSH_CACHE_DIR/grep_alias.zsh"
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source "$ZSH_CACHE_DIR/grep_alias.zsh"
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# clean up
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unset GREP_OPTIONS EXC_FOLDERS
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unfunction grep-flags-available
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fi
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unset _grep_alias_cache
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