Add a custom launcher based on fzf

bin/launcher.sh

@@ -0,0 +1,64 @@
+#!/bin/sh
+# terminal application launcher for sway, using fzf
+# original command:
+# Based on: https://github.com/swaywm/sway/issues/1367
+# bindsym $altkey+space exec termite --name=launcher -e \
+#    "bash -c 'compgen -c | sort -u | fzf --no-extended --print-query | \
+#    tail -n1 | xargs -r swaymsg -t command exec'"
+
+HIST_FILE="${XDG_CACHE_HOME:-$HOME/.cache}/sway-launcher-history.txt"
+FZF_OPTIONS="--layout=reverse --no-extended --print-query --no-sort"
+
+# Get shell command list
+# This may include the occasional non-executable file
+# command_list=$({ IFS=:; ls -H $PATH; } | grep -v '/.*' | sort -u)
+command_list=$(find $(echo $PATH | tr ':' ' ') -type f -executable -printf "\n%f")
+# read existing command history
+if [ -f "$HIST_FILE" ]; then
+    command_history=$(cat "$HIST_FILE")
+else
+    command_history=""
+fi
+
+# search command list
+command_str=$(printf "%s\n" "${command_history}" "${command_list}" | \
+    sed -E 's/^[0-9]+ (.+)$/\1/' | \
+    fzf $FZF_OPTIONS | \
+    tail -n1) || exit 1
+
+if [ "$command_str" = "" ]; then
+    exit 1
+fi
+# echo "Command: $command_str"
+
+# using \E flag from perl regex
+test "${command_str#*\\E}" != "$command_str" && echo "command can't contain '\E'"
+test "${command_str#*\\E}" != "$command_str" && exit 1
+
+# get full line from history (with count number)
+hist_line=$(echo "$command_history" | grep -Pe "^[0-9]+ \Q$command_str\E$")
+# echo "Hist Line: $hist_line"
+
+if [ "$hist_line" = "" ]; then
+    hist_count=1
+else
+    # Increment usage count
+    hist_count=$(echo "$hist_line" | sed -E 's/^([0-9]+) .+$/\1/')
+    hist_count=$((hist_count + 1))
+    # delete line, to add updated later
+    # echo "Hist Before: $command_history"
+    command_history=$(echo "$command_history" | \
+        grep --invert-match -Pe "^[0-9]+ \Q$command_str\E$")
+    # echo "Hist After: $command_history"
+fi
+
+# update history
+update_line="${hist_count} ${command_str}"
+printf "%s\n" "${update_line}" "${command_history}" | \
+    sort --numeric-sort --reverse > "$HIST_FILE"
+# echo "$update_line"
+
+# execute command
+echo "$command_str"
+swaymsg -t command exec "$command_str"
+