[RFC 06/10] scripts: add a kernel-doc helper for special invocation

[Jani Nikula]

Add a helper for calling kernel-doc, with the -w parameter describing
the parameters to pass on to kernel-doc, in a special format.

[This is easier to explain and will make more sense in the context of
the following patches. The -w parameter is expected to be a filename
with the kernel-doc parameters encoded at the end of the filename. This
could be included in kernel-doc itself, but it feels like polluting the
tool. So here's a helper, at least for now.]

Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
---
 scripts/kernel-doc-helper | 70 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100755 scripts/kernel-doc-helper

diff --git a/scripts/kernel-doc-helper b/scripts/kernel-doc-helper
new file mode 100755
index 000000000000..1e26266f9feb
--- /dev/null
+++ b/scripts/kernel-doc-helper
@@ -0,0 +1,70 @@
+#!/bin/bash
+
+KERNELDOC=kernel-doc
+OUTPUT_FORMAT=-asciidoc
+
+WHAT=
+
+usage()
+{
+	cat <<EOF
+$ kernel-doc-helper [-k KERNELDOC] -w WHAT SOURCE
+
+Run KERNELDOC (kernel-doc by default) on SOURCE to extract information specified
+by WHAT.
+
+WHAT is an arbitrary string ending in special suffixes that are converted to
+kernel-doc parameters.
+EOF
+	exit 0
+}
+
+while getopts "hw:k:" opt; do
+	case "$opt" in
+		h)
+			usage
+			;;
+		w)
+			WHAT="$OPTARG"
+			;;
+		k)
+			KERNELDOC="$OPTARG"
+			;;
+		*)
+			exit 1
+	esac
+done
+shift `expr $OPTIND - 1`
+
+if [ "$#" = "0" ]; then
+	echo "$0: source file missing" >&2
+	exit 1
+fi
+
+if [ -z "$WHAT" ]; then
+	echo "$0: output selection (-w) missing" >&2
+	exit 1
+fi
+
+SOURCE=$1
+
+case $WHAT in
+	*,export)
+		exec $KERNELDOC $OUTPUT_FORMAT -export $SOURCE
+		;;
+	*,internal)
+		exec $KERNELDOC $OUTPUT_FORMAT -internal $SOURCE
+		;;
+	*,function,*)
+		name=${WHAT##*,function,}
+		exec $KERNELDOC $OUTPUT_FORMAT -function $name $SOURCE
+		;;
+	*,doc,*)
+		name=${WHAT##*,doc,}
+		exec $KERNELDOC $OUTPUT_FORMAT -doc $name $SOURCE
+		;;
+	*)
+		echo "$0: unknown output selection '$WHAT'" >&2
+		exit 1
+		;;
+esac
-- 
2.1.4