Better handling of Wayland compositors (#1539)

* Better handling of Wayland compositors * Reinstate setting ps_flags, it's used elsewhere * Try another incantation * Try another incantation * Try another incantation * Use short options and a newline to reduce line-length * Rework to handle the "better way" failing on some systems and fall back to the old method (which has the virtue of working most of the time).

Better handling of Wayland compositors (#1539)
fb572770 · Alan Griffiths · GitHub · 77bac34c · fb572770
Unverified Commit fb572770 authored Oct 04, 2020 by Alan Griffiths Committed by GitHub Oct 04, 2020
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--- a/neofetch
+++ b/neofetch
@@ -1815,7 +1815,14 @@ get_wm() {
        *)         ps_flags=(-e) ;;
    esac
-    if [[ $WAYLAND_DISPLAY ]]; then
+    if [[ -O "${XDG_RUNTIME_DIR}/${WAYLAND_DISPLAY:-wayland-0}" ]]; then
+        if tmp_pid="$(lsof -t "${XDG_RUNTIME_DIR}/${WAYLAND_DISPLAY:-wayland-0}" 2>&1)" ||
+           tmp_pid="$(fuser   "${XDG_RUNTIME_DIR}/${WAYLAND_DISPLAY:-wayland-0}" 2>&1)"; then
+            wm="$(ps -p "${tmp_pid}" -ho comm=)"
+        else
+            # lsof may not exist, or may need root on some systems. Similarly fuser.
+            # On those systems we search for a list of known window managers, this can mistakenly
+            # match processes for another user or session and will miss unlisted window managers.
            wm=$(ps "${ps_flags[@]}" | grep -m 1 -o -F \
                               -e arcan \
                               -e asc \
@@ -1844,6 +1851,7 @@ get_wm() {
                               -e westeros \
                               -e westford \
                               -e weston)
+        fi
    elif [[ $DISPLAY && $os != "Mac OS X" && $os != "macOS" && $os != FreeMiNT ]]; then
        type -p xprop &>/dev/null && {