helpers.sh: Add vgsys

vgsys - filters vgstash's output by system. Optionally allows one to
        specify the filter name to pass to vgstash. The default filter
        is 'allgames'.

For example, to show every game needed to be beaten on Steam, you'd use
something like this:

    vgsys backlog Steam

This is a handy feature to have when you want to narrow down your
options for what-to-play.

1 files changed, 24 insertions, 0 deletions

diff --git a/scripts/helpers.sh b/scripts/helpers.sh
index b726f0b..69aa59a 100644
--- a/scripts/helpers.sh
+++ b/scripts/helpers.sh
@@ -54,3 +54,27 @@ function vgrand() {
 	local game=$(vgstash list playlog | sed -e '1,2d' | shuf -n 1 --random-source=/dev/random | cut -d '|' -f 1-2 | tr -s ' ' | sed -e 's: | :, for :' -e 's:\s$::')
 	echo "You should play ${game}!"
 }
+
+# Filters your vgstash output by system. Depends on awk
+function vgsys() {
+	local f='allgames'
+	local s=''
+	case $# in
+		1)
+			# single arg means we want the default filter
+			s="$1"
+			;;
+		2)
+			f="$1"
+			s="$2"
+			;;
+		*)
+			echo "USAGE: vgsys [FILTER] SYSTEM"
+			echo
+			echo "Show all games from a given system (and optionally, filter)."
+			echo "Defaults to 'allgames' filter if the argument is missing."
+			return
+			;;
+	esac
+	vgstash list $f -w 80 | awk 'BEGIN {FS="|"} $2 ~ /'$s'/'
+}