nixpkgs/pkgs/tools/graphics/gnuplot/set-gdfontpath-from-fontconfig.sh

p=( $(fc-list : file | sed "s@/[^/]*: @@" | sort -u) )
IFS=:
export GDFONTPATH="${GDFONTPATH}${GDFONTPATH:+:}${p[*]}"
unset IFS p
gnuplot: Improve startup performance Before executing the gnuplot executable the environment variable `GDFONTPATH` is populated with a list of font directories, which is obtained from `fc-list`. In that process we iterated over each line and called `dirname` on it, which introduces a performance hit for loading and executing the external executable `dirname` every time. The new version avoids the loop. The author of this patch measured a 42 fold performance improvement: old version: $ time ./gnuplot_old/bin/gnuplot -e '' real 0m3.828s user 0m0.392s sys 0m0.465s new version: $ time ./gnuplot_new2/bin/gnuplot -e '' real 0m0.091s user 0m0.112s sys 0m0.014s The correctness of the value of `GDFONTPATH` was confirmed with the following command and comparing its output between versions: $ gnuplot -e 'print system("echo $GDFONTPATH")' 2016-01-11 11:36:50 +01:00			`p=( $(fc-list : file \| sed "s@/[^/]*: @@" \| sort -u) )`
gnuplot: configure GDFONTPATH using 'fontconfig' This patch adds a wrapper script around gnuplot that uses fontconfig's fc-list(1) utility to determine the set of available fonts and makes that list available to Gnuplot in the $GDFONTPATH variable. 2013-02-18 00:00:48 +01:00			`IFS=:`
			`export GDFONTPATH="${GDFONTPATH}${GDFONTPATH:+:}${p[*]}"`
			`unset IFS p`