From 47e89de7b8cbb9b26f1e4471702c9def3063f940 Mon Sep 17 00:00:00 2001
From: James Rayner <james@archlinux.org>
Date: Mon, 7 Sep 2009 19:27:35 +1000
Subject: Use wpa_supplicant for list_networks

---
 src-wireless/netcfg-auto-wireless |  3 +--
 src/wireless                      | 47 +++++++++++++++++----------------------
 2 files changed, 21 insertions(+), 29 deletions(-)

diff --git a/src-wireless/netcfg-auto-wireless b/src-wireless/netcfg-auto-wireless
index bbee281..fb076eb 100644
--- a/src-wireless/netcfg-auto-wireless
+++ b/src-wireless/netcfg-auto-wireless
@@ -11,11 +11,10 @@ wifi_auto()
 {
     local interface="$1"
     report_try "Scanning for networks"
-
 	set_interface up "$interface"	# uses iproute methods---is it there any value to providing option to use ifconfig?
     networks="$(list_networks $interface)"
 
-    if [[ ! "$networks" ]]; then
+    if [[ -z $networks ]]; then
 		set_interface forcedown "$interface"
         exit_fail "- No networks available."
     fi
diff --git a/src/wireless b/src/wireless
index 2c9e681..81a8408 100644
--- a/src/wireless
+++ b/src/wireless
@@ -93,34 +93,27 @@ list_networks()
     [[ -z "$INTERFACE" ]] && return 1
     essids=$(mktemp /tmp/essid.XXXXXXXX)
 
-#     # James suggested using this, but it requires wpa_supplicant to be running
-#     wpa_cli -i "$INTERFACE" scan 2>/dev/null || { rm $essids; return 1; }
-#     sleep 0.5
-#     wpa_cli -i "$INTERFACE" scan_results > $essids 2>/dev/null || { rm $essids; return 1; }
 
-    {
-    while [[ "$try" -lt "$RETRIES" ]]; do        
-            sleep 0.5
-            let try++
-          # iwlist "$INTERFACE" scan 2> /dev/null | fgrep "ESSID" | sed 's/.*ESSID:"\([^"]\+\)".*/\1/' > $essids
-            res=$(iwlist "$INTERFACE" scan 2> /dev/null)
-            [[ -z "$res" ]] && continue 
-            scanned=1
-            # we only bother with at most 5 successful scans
-            if (( try < RETRIES-4 )); then try=$((RETRIES-4)); fi
-            echo "$res" | sed -r '1d; $ { H; ba }; 2 { h; d }; /^\s+Cell /! { H; d }; :a; x; s/\n/ /g'
-    done
-    } \
-        | sed -rne 's/.*Address: ([[:xdigit:]:]+).*ESSID:"([^"]*)".*Quality=([0-9]+).*/\1\t\3\t\1\t\2/p' \
-            -e 's/.*Address: ([[:xdigit:]:]+).*Quality=([0-9]+).*ESSID:"([^"]*)".*/\1\t\2\t\1\t\3/p' \
-        | sort -k1 -k2nr | uniq -w17 \
-        | sort -k2nr \
-        | cut -f3- > "$essids"
-    # 1. make tab-separated fields: ap, signal-strength, ap, essid (easiest way to use uniq and cut here requires ap twice)
-    # 2. eliminate duplicate aps (keeping strongest signal)
-    # 3. sort entire list by decreasing signal
-    # 4. then return tab-separated fields: ap, essid (ap needs to come first so that read can assume format is <word> <rest of line>)
-  
+    wpa_supplicant -B -i$INTERFACE -Dwext -C/var/run/wpa_supplicant -P/var/run/wpa_supplicant.pid
+    wpa_cli -i "$INTERFACE" scan &> /dev/null
+    sleep 2.5
+    wpa_cli -i "$INTERFACE" scan_results |
+        grep -v "^Selected" |
+        grep -v "^bssid" |
+        sort -rn -k3 |
+        sort -u -k5 |
+        sort -rn -k3 |
+        cut -f1,5  > "$essids" 
+
+    # Fields are tab delimited
+    # Remove extraneous output from wpa_cli
+    # Sort by strength
+    # Remove duplicates
+    # Re-sort by strength as the removal disorders the list
+    # Cut to the AP/essid fields only
+    
+    kill $(cat /var/run/wpa_supplicant.pid)
+    
     # File of 0 length, ie. no ssid's.
     if [[ ! -s $essids ]]; then
         rm -f $essids 
-- 
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