From 61a3a577d0a75477df94e5e29d4bd29407c52623 Mon Sep 17 00:00:00 2001
From: Emily Frost <emfrost@posteo.net>
Date: Wed, 30 Jan 2019 10:59:32 -0600
Subject: [PATCH] Added display name autodetection for setdisplay.

---
 setdisplay | 39 +++++++++++++++++++++++++++++++++------
 1 file changed, 33 insertions(+), 6 deletions(-)

diff --git a/setdisplay b/setdisplay
index 7431e43..9c5e4b1 100755
--- a/setdisplay
+++ b/setdisplay
@@ -39,6 +39,31 @@ function display_config() {
     display_configurations[$display_name]="$display_config"
 }
 
+function guess_output_from_class() {
+    display_class="$1"
+
+    canonical_display_name=''
+
+    for display in "${!display_configurations[@]}"; do
+        if [[ ( $display == ${display_class}* ) && \
+            ( "${connected_displays[$display]}" == 'yes' ) ]]; then
+
+            if [[ $canonical_display_name == '' ]]; then
+                canonical_display_name="$display"
+            else
+                echo "Multiple displays of class ${display_class} are connected. Quitting."
+                exit 1
+            fi
+        fi
+    done
+
+    if [[ $canonical_display_name == '' ]]; then
+        echo "No displays of class ${display_class} found. Quitting."
+        exit 1
+    fi
+    echo "$canonical_display_name"
+}
+
 declare -A display_configurations
 declare -A connected_displays
 
@@ -62,17 +87,18 @@ while read -r display_line; do
     display_configurations[$display_name]=' --off'
 done <<< "$(xrandr | grep connected)"
 
-# TODO: I'm very lazy, so build a method that automatically figures out which HDMI
-#   output to use if there's only one.
+# TODO: These cases can probably just be read from input now.
 case $display_profile in
-    'lvds-hdmi1')
+    'lvds-hdmi')
+        hdmi_display="$(guess_output_from_class "HDMI")"
         display_config 'LVDS1' '--primary --mode 1366x768'
-        display_config 'HDMI1' '--mode 1280x720 --above LVDS1'
+        display_config "$hdmi_display" '--mode 1280x720 --above LVDS1'
         audio_profile='output:hdmi-stereo'
         ;;
 
-    'hdmi1')
-        display_config 'HDMI1' '--primary --mode 1280x720'
+    'hdmi')
+        hdmi_display="$(guess_output_from_class "HDMI")"
+        display_config "$hdmi_display" '--primary --mode 1280x720'
         audio_profile='output:hdmi-stereo'
         ;;
 
@@ -95,5 +121,6 @@ esac
 
 call_xrandr
 if [ "$switch_audio" = 'yes' ]; then
+    # TODO: Figure out how to remove this dependency.
     ponymix -c 0 set-profile "${audio_profile}"
 fi