buku-fzf function, dmenu with history

scripts/executable_dmenu-history

@@ -0,0 +1,50 @@
+#!/bin/sh
+
+cachedir=${XDG_CACHE_HOME:-"$HOME/.cache"}
+if [ -d "$cachedir" ]; then
+	cache=$cachedir/dmenu_run
+	historyfile=$cachedir/dmenu_history
+else			# if no xdg dir, fall back to dotfiles in ~
+	cache=$HOME/.dmenu_cache
+	historyfile=$HOME/.dmenu_history
+fi
+
+IFS=:
+if stest -dqr -n "$cache" $PATH; then
+	stest -flx $PATH | sort -u > "$cache"
+fi
+unset IFS
+
+awk -v histfile=$historyfile '
+	BEGIN {
+		while( (getline < histfile) > 0 ) {
+			sub("^[0-9]+\t","")
+			print
+			x[$0]=1
+		}
+	} !x[$0]++ ' "$cache" \
+	| dmenu "$@" \
+	| awk -v histfile=$historyfile '
+		BEGIN {
+			FS=OFS="\t"
+			while ( (getline < histfile) > 0 ) {
+				count=$1
+				sub("^[0-9]+\t","")
+				fname=$0
+				history[fname]=count
+			}
+			close(histfile)
+		}
+
+		{
+			history[$0]++
+			print
+		}
+
+		END {
+			if(!NR) exit
+			for (f in history)
+				print history[f],f | "sort -t '\t' -k1rn >" histfile
+		}
+	' \
+	| while read cmd; do ${SHELL:-"/bin/sh"} -c "$cmd" & done