get-patch: download a git patch

Given a URL (and optionally a subject), determine the patch location and
save to a file based on the sanitized subject line.

1 files changed, 51 insertions, 0 deletions

diff --git a/get-patch b/get-patch
new file mode 100755
index 0000000..c0a34bb
--- /dev/null
+++ b/get-patch
@@ -0,0 +1,51 @@
+#!/bin/bash
+url=$1
+subject=$2
+outfile=
+
+case $url in
+*/gitweb/*)
+	url=$(sed -r 's/([;?])a=[^;]*/\1a=patch/' <<<"$url")
+	;;
+esac
+
+if [ -z "$url" ]; then
+	echo "Usage: $0 patch-url [subject]"
+	exit
+fi
+
+normalize_name() {
+	tr -c a-zA-Z0-9._ - | sed 's/--*/-/g;s/^[.-]*//;s/[.-]*$//' | cut -c1-50
+}
+find_subject() {
+	awk '/^ /{if(s)s=s$0}
+	{if(s)exit}
+	/^Subject:/{s=s$0}
+	END{sub(/^Subject: \[PATCH[^\]]*\] /,"",s);print s}'
+}
+
+subject=$(echo "$subject" | normalize_name)
+
+if [ -n "$subject" ]; then
+	outfile="$subject.patch"
+	wget -O "$outfile" "$url" || exit 1
+else
+	outfile="$(mktemp patch-XXXXXXXXXX)"
+	if wget -O "$outfile" "$url"; then
+		subject=$(find_subject <"$outfile")
+		if [ -z "$subject" ]; then
+			echo "Subject not found!"
+			rm "$outfile"
+			exit 1
+		fi
+
+		patchfile="$(echo "$subject" | normalize_name).patch"
+		mv "$outfile" "$patchfile"
+		outfile="$patchfile"
+	else
+		rm "$outfile"
+		exit 1
+	fi
+fi
+
+echo "$outfile"