batman: If fzf is installed, use batman to search through man pages

doc/batman.md

@@ -4,6 +4,7 @@ Read system manual pages (`man`) using `bat` as the manual page formatter.
 
 Gone are the days of losing your place while reading through monotone manual pages. With `bat` and `batman`, you can read `man ifconfig` with beautiful 24-bit color and syntax higlighting.
 
+If you have `fzf` installed, you can even use `batman` to search through manual pages!
 
 
 ## Usage

lib/constants.sh

@@ -13,6 +13,7 @@ EXECUTABLE_BAT="$(command -v bat 2>/dev/null || command -v batcat 2>/dev/null ||
 EXECUTABLE_GIT="git"
 EXECUTABLE_DELTA="delta"
 EXECUTABLE_RIPGREP="rg"
+EXECUTABLE_FZF="fzf"
 
 # Constants: Program
 PROGRAM="$(basename "$0" .sh)"

src/batman.sh

@@ -42,5 +42,30 @@ fi
 export MANPAGER='sh -c "col -bx | '"$(printf "%q" "$EXECUTABLE_BAT")"' --language=man '$(printf "%q " "${BAT_ARGS[@]}")'"'
 export MANROFFOPT='-c'
 
+# If no argument is provided and fzf is installed, use fzf to search for man pages.
+if [[ "${#MAN_ARGS[@]}" -eq 0 ]] && [[ -z "$BATMAN_LEVEL" ]] && command -v "$EXECUTABLE_FZF" &>/dev/null; then
+	export BATMAN_LEVEL=1
+	
+	selected_page="$(man -k . | "$EXECUTABLE_FZF" --delimiter=" - " --reverse -e --preview="
+		echo {1} \
+		| sed 's/, /\n/g;' \
+		| sed 's/\([^(]*\)(\([0-9]\))/\2\t\1/' \
+		| BAT_STYLE=plain xargs batman --color=always --paging=never
+		" | sed 's/^\(.*\) - .*$/\1/; s/, /\n/g'
+	)"
+	
+	if [[ -z "$selected_page" ]]; then
+		exit 0
+	fi
+	
+	# Convert the page(section) format to something that can be fed to the man command.
+	while read -r line; do
+		if [[ "$line" =~ ^(.*)\(([0-9]+)\)$ ]]; then
+			MAN_ARGS+=("${BASH_REMATCH[2]}" "${BASH_REMATCH[1]}")
+		fi
+	done <<< "$selected_page"	
+fi
+
+# Run man.
 command man "${MAN_ARGS[@]}"
 exit $?