Rewrite launcher

bin/launcher.sh

@@ -1,66 +1,36 @@
-#!/bin/sh
+#!/bin/bash
 # 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'"
+# inspired by https://github.com/Biont/sway-launcher-desktop
 
+set -o pipefail
+shopt -s nullglob globstar
 HIST_FILE="${XDG_CACHE_HOME:-$HOME/.cache}/sway-launcher-history.txt"
-FZF_OPTIONS="--layout=reverse --no-extended --print-query --no-sort"
+export FZF_DEFAULT_OPTS="--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 $PATH | tr ':' ' ') -type f -executable -printf "\n%f" | \
-    sort -u)
-# read existing command history
-if [ -f "$HIST_FILE" ]; then
-    command_history=$(cat "$HIST_FILE")
+[ ! -f "$HIST_FILE" ] && touch {"$HIST_FILE" 
+# Create fifo for populate fzf in async mode
+FZFPIPE=$(mktemp -u)
+mkfifo "$FZFPIPE"
+trap 'rm "$FZFPIPE"' EXIT INT
+
+#retrieve history and pipe it into our fifo
+readarray HIST_LINES <"$HIST_FILE"
+(printf '%s' "${HIST_LINES[@]#* }" >>"$FZFPIPE") &
+
+# Get command, if empty exit
+command=$(fzf <"$FZFPIPE" | tail -n1 || exit 1)
+[[ "$command" == "" ]] && exit 0
+
+# Update history
+index=$(printf '%s' "${HIST_LINES[@]}" | grep -n -Pe "^[0-9]+ ${command}$" | awk -F ':' '{print $1-1}')
+if [ -n "$index" ]; then
+    occurences=${HIST_LINES[$index]%% *}
+    occurences=$((occurences + 1))
+    HIST_LINES[$index]="${occurences} ${command}"$'\n'
 else
-    command_history=""
+    HIST_LINES+=("1 $command"$'\n')
 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: $command_str"
-
-# using \E flag from https://github.com/junegunn/fzfperl regex
-test "${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 "$command_str"
-
+printf '%s' "${HIST_LINES[@]}" | sort --numeric-sort --reverse > "$HIST_FILE"
+swaymsg -t command exec "$command"
+exit 0