batpipe: Add support for *.gz files

doc/batpipe.md

@@ -26,7 +26,7 @@ Like [lesspipe](https://github.com/wofr06/lesspipe), `batpipe` is designed to wo
 | Directories          | `ls`                        |
 | `*.tar`, `*.tar.gz`  | `tar`                       |
 | `*.zip`, `*.jar`     | `unzip`                     |
-
+| `*.gz`               | `gunzip`                    |
 
 
 ## External Viewers

src/batpipe.sh

@@ -109,7 +109,7 @@ fi
 # Viewers:
 # -----------------------------------------------------------------------------
 
-BATPIPE_VIEWERS=("ls" "tar" "unzip")
+BATPIPE_VIEWERS=("ls" "tar" "unzip" "gunzip")
 
 # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 
@@ -171,6 +171,24 @@ viewer_unzip_process() {
 	fi
 }
 
+# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+viewer_gunzip_supports() {
+	command -v "gunzip" &> /dev/null || return 1
+	[[ -z "$3" ]] || return 1
+
+	case "$2" in
+		*.gz) return 0 ;;
+	esac
+
+	return 1
+}
+
+viewer_gunzip_process() {
+	gunzip -k -c "$1"
+	return $?
+}
+
 # -----------------------------------------------------------------------------
 # Functions:
 # -----------------------------------------------------------------------------