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-rwxr-xr-xpkgs/simple/xdpytools/src/xdpysel49
1 files changed, 49 insertions, 0 deletions
diff --git a/pkgs/simple/xdpytools/src/xdpysel b/pkgs/simple/xdpytools/src/xdpysel
new file mode 100755
index 0000000..e080155
--- /dev/null
+++ b/pkgs/simple/xdpytools/src/xdpysel
@@ -0,0 +1,49 @@
+#! /bin/sh
+# usage: xdpysel {prev,next}
+# Print the number of the selected X display.
+
+find /tmp/.X11-unix -mindepth 1 -maxdepth 1 |
+jq -Rrs --arg command "$1" '
+ (
+ split("\n") |
+ map(
+ select(.!="") |
+ match("^.*/X([0-9]+)$").captures[0].string |
+ tonumber
+ )
+ )
+ as $all_displays |
+
+ (
+ env.DISPLAY |
+ match("^:([0-9]+)(?:[.][0-9]+)?$").captures[0].string |
+ tonumber
+ )
+ as $current_display |
+
+ ($all_displays | length) as $all_displays_count |
+
+ ($all_displays|index($current_display))
+ as $current_index |
+
+ (($current_index + 1) % $all_displays_count)
+ as $next_index |
+
+ (($all_displays_count + $current_index - 1) % $all_displays_count)
+ as $prev_index |
+
+ $all_displays[$prev_index] as $prev_display |
+ $all_displays[$next_index] as $next_display |
+
+ {
+ prev: $prev_display,
+ next: $next_display,
+ }[$command]
+ as $result |
+
+ if $result | type == "number" then
+ $result
+ else
+ "xdpysel: bad argument: \($command)\n" | halt_error(-1)
+ end
+'