From 4fb16a6998ea6bd33f6e0cba51d541d146370531 Mon Sep 17 00:00:00 2001
From: Mattias Andrée <maandree@kth.se>
Date: Tue, 19 Apr 2016 17:34:11 +0200
Subject: add support for ~/.config/geolocation and /etc/geolocation
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Signed-off-by: Mattias Andrée <maandree@kth.se>
---
 metar | 35 ++++++++++++++++++++++++++++++++---
 1 file changed, 32 insertions(+), 3 deletions(-)

diff --git a/metar b/metar
index b9c68c8..4953882 100755
--- a/metar
+++ b/metar
@@ -1,8 +1,10 @@
 #!/bin/sh
 
+set -e
+
 usage ()
 {
-    echo "usage: $0 (get | print | set STATION | list [PREFIX] | closest LATITUDE LONGITUDE [LIST])"
+    echo "usage: $0 (get | print | set STATION | list [PREFIX] | closest [LATITUDE LONGITUDE] [LIST])"
 }
 
 get_station ()
@@ -20,6 +22,27 @@ get_station ()
     echo "$icao"
 }
 
+get_location ()
+{
+    geo=""
+    if test -f ~/.config/geolocation; then
+	geo="$(cat ~/.config/geolocation | head -n 1)"
+	geof=~/.config/geolocation
+    elif test -f /etc/geolocation; then
+	geo="$(cat /etc/geolocation | head -n 1)"
+	geof=/etc/geolocation
+    fi
+    if test -z "$geo"; then
+	echo 'No location has been specificed or configured.' >&2
+	exit 1
+    fi
+    if ! test $(printf '%s\n' $geo | wc -l) = 2; then
+	echo "Invalid geolocation configuration (${geof})." >&2
+	exit 1
+    fi
+    echo "$geo"
+}
+
 list_stations ()
 {
     file="$(mktemp)"
@@ -45,8 +68,8 @@ get_closest ()
 	location="$(echo "$line" | cut -d ')' -f 2 | cut -d ' ' -f 2,3)"
 	latitude="$(echo "$location" | cut -d ' ' -f 1)"
 	longitude="$(echo "$location" | cut -d ' ' -f 2)"
-	north="$(echo "$latitude" | grep 'S' > /dev/null; echo $?)"
-	east="$(echo "$longitude" | grep 'W' > /dev/null; echo $?)"
+	north="$(set +e; echo "$latitude" | grep 'S' > /dev/null; echo $?)"
+	east="$(set +e; echo "$longitude" | grep 'W' > /dev/null; echo $?)"
 	latitude="$(echo "$latitude" | tr -d NSEW | sed 's/-/ /g')"
 	longitude="$(echo "$longitude" | tr -d NSEW | sed 's/-/ /g')"
 	best="$(python3 - $north "$latitude" $east "$longitude" "$1" "$2" "$icao" $best <<EOF
@@ -87,6 +110,12 @@ elif test $# = 1 && test "$1" =  "list"; then
     list_stations ""
 elif test $# = 2 && test "$1" =  "list"; then
     list_stations "$(echo "$2" | tr [a-z] [A-Z])"
+elif test $# = 1 && test "$1" =  "closest"; then
+    location="$(get_location)"
+    list_stations "" | get_closest $location
+elif test $# = 2 && test "$1" =  "closest"; then
+    location="$(get_location)"
+    get_closest $location < "$2"
 elif test $# = 3 && test "$1" =  "closest"; then
     list_stations "" | get_closest "$2" "$3"
 elif test $# = 4 && test "$1" =  "closest"; then
-- 
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