1 files changed, 58 insertions, 0 deletions
diff --git a/bin/set-screen b/bin/set-screen
new file mode 100755
index 0000000..49556e2
--- /dev/null
+++ b/bin/set-screen
@@ -0,0 +1,58 @@
+#!/bin/bash
+
+CONFIG_DIR="${HOME}/.config/set-screen"
+
+function get_display_state_hash() {
+    local hash etc
+    read hash etc < <(
+    for i in /sys/class/drm/card*/card*-*; do
+        echo $i
+        cat $i/status
+        cat $i/edid
+    done | sha1sum -b)
+    echo "$hash"
+}
+
+function display_state_dir() {
+    local hash
+    hash="$(get_display_state_hash)"
+    echo "${CONFIG_DIR}/$hash"
+}
+
+function make_display_state_dir() {
+    local dir
+    dir="$(display_state_dir)"
+    mkdir -p "$dir"
+    echo "Created $dir"
+}
+
+function run_display_state_commands() {
+    local dir
+    dir="$(display_state_dir)"
+
+    if [[ -x "${dir}/command" ]]; then
+        "${dir}/command"
+        if [[ -x "${CONFIG_DIR}/post-command" ]]; then
+            "${CONFIG_DIR}/post-command"
+        fi
+    fi
+}
+
+function print_usage() {
+    cat <<EOF
+$0 -- re-configure screens
+
+Usage:
+ $0 make   create directory for current state
+ $0 set    execute 'command' script in directory for current state
+ $0        same as 'set'
+ $0 help   show this text
+EOF
+}
+
+case "$1" in
+    'make') make_display_state_dir ;;
+    '' | 'set') run_display_state_commands ;;
+    'help' | '--help' ) print_usage ; exit 0 ;;
+    *) >&2 print_usage; exit 1 ;;
+esac