From e0c6d9110f658d1fb22c07fa398d3f50b23612e3 Mon Sep 17 00:00:00 2001
From: David Phillips <david@sighup.nz>
Date: Thu, 26 Jul 2018 21:53:18 +1200
Subject: Fill some help holes in

---
 introspect.sh | 57 +++++++++++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 47 insertions(+), 10 deletions(-)

diff --git a/introspect.sh b/introspect.sh
index 9ae80ed..850d03b 100755
--- a/introspect.sh
+++ b/introspect.sh
@@ -1,32 +1,69 @@
 #!/bin/bash
 
+function assert_eq() {
+	local expected="$1"
+	local actual="$2"
+	local message="$3"
+	if [ "$1" -ne "$2" ] ; then
+		if [ ! -z "$message" ]; then
+			echo "$message"
+		fi
+		die_usage
+	fi
+}
+
+function assert_le() {
+	local expected="$1"
+	local actual="$2"
+	local message="$3"
+	if [ "$1" -gt "$2" ] ; then
+		if [ ! -z "$message" ]; then
+			echo "$message"
+		fi
+		die_usage
+	fi
+}
+
+function get_pkginfo() {
+	local file="$1"
+	# FIXME remove dep on GNU tar
+	tar --to-stdout -xf "$file" .PKGINFO
+}
+
 function get_pkginfo_field() {
 	local file="$1"
 	local field="$2"
-	# FIXME remove dep on GNU tar
-	tar --to-stdout -xf "$file" .PKGINFO | grep '^'"$field"'' | awk -F' = ' '{print $2}'
+	get_pkginfo "$file" | grep '^'"$field"'' | awk -F' = ' '{print $2}'
 }
 
 function die_usage() {
-	echo "FIXME"
+	echo "Syntax: introspect.sh <action> [options]"
+	echo ""
+	echo "Valid actions:"
+	echo "all   <package>"
+	echo "field <package> <field_name>"
+	echo "files <package>"
+	exit 1
 }
 
-if [ "$#" -le 2 ]; then
-	echo Not enough arguments
-	die_usage
-fi
+assert_le 2 $# "Not enough arguments"
 
 case "$1" in
+	"all")
+		assert_eq 2 $#
+		get_pkginfo $2
+		;;
 	"field")
-		# FIXME must have two more aguments
+		assert_eq 3 $#
 		get_pkginfo_field $2 $3
 		;;
 	"files")
-		echo Not implemented
+		assert_eq 2 $#
+		echo Files not implemented
 		exit 1
 		;;
 	*)
-		echo "Unknown action \"$2\""
+		echo "Unknown action \"$1\""
 		die_usage
 		;;
 esac
-- 
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