gen_funcs.sh: Import makeopts_jobs function from multiprocessing eclass

Signed-off-by: Thomas Deutschmann <whissi@gentoo.org>

1 files changed, 20 insertions, 0 deletions

diff --git a/gen_funcs.sh b/gen_funcs.sh
index 381c6459..c3bcee62 100755
--- a/gen_funcs.sh
+++ b/gen_funcs.sh
@@ -1853,5 +1853,25 @@ make_bootdir_writable() {
 	fi
 }
 
+# @FUNCTION: makeopts_jobs
+# @USAGE: [${MAKEOPTS}] [${inf:-999}]
+# @DESCRIPTION:
+# Searches the arguments (defaults to ${MAKEOPTS}) and extracts the jobs number
+# specified therein.  Useful for running non-make tools in parallel too.
+# i.e. if the user has MAKEOPTS=-j9, this will echo "9" -- we can't return the
+# number as bash normalizes it to [0, 255].  If the flags haven't specified a
+# -j flag, then "1" is shown as that is the default `make` uses.  Since there's
+# no way to represent infinity, we return ${inf} (defaults to 999) if the user
+# has -j without a number.
+makeopts_jobs() {
+	[[ $# -eq 0 ]] && set -- "${MAKEOPTS}"
+	# This assumes the first .* will be more greedy than the second .*
+	# since POSIX doesn't specify a non-greedy match (i.e. ".*?").
+	local jobs=$(echo " $* " | sed -r -n \
+		-e 's:.*[[:space:]](-[a-z]*j|--jobs[=[:space:]])[[:space:]]*([0-9]+).*:\2:p' \
+		-e "s:.*[[:space:]](-[a-z]*j|--jobs)[[:space:]].*:${2:-999}:p")
+	echo ${jobs:-1}
+}
+
 unset GK_DEFAULT_IFS
 declare -r GK_DEFAULT_IFS="${IFS}"