code overhaul

Signed-off-by: fbt <fbt@fleshless.org>

README.md

@@ -1,10 +1,22 @@
-sx-open
-=======
+# sx-open
 
 sx-open is an attempt to implement a saner alternative to xdg-open.
 
-Installation
-------------
+## Installation
 
 Clone the repo, drop sx-open.cfg into your $HOME/.config.
 As this thing is meant to replace xdg-open, you will probably want to link sx-open into xdg-open somewhere in your $PATH as to override the default one.
+
+## Usage
+
+	sx-open [-dhv] <uri/file>
+	Flags:
+	  -d   Dry run
+	  -v   Verbose
+	  -h   Help
+
+### Exit codes
+
+ * 1 — action failed
+ * 2 — file not found
+ * 3 — no handlers found

sx-open

@@ -1,57 +1,137 @@
 #!/usr/bin/env bash
 # This is an attempt to replace xdg-open with something sane.
 
-# Source the config file.
-cfg_file="$HOME/.config/sx-open.cfg"
-[[ -f "$cfg_file" ]] && { source "$cfg_file"; }
+usage() { printf '%s [-dhv] <uri/file>\n' "${0##*/}"; }
 
-usage() { printf '%s <uri/file>\n' "${0##*/}"; }
+usage() {
+	cat <<- EOF
+		sx-open [-dhv] <uri/file>
+		Flags:
+		  -d   Dry run
+		  -v   Verbose
+		  -h   Help
+	EOF
+}
 
+act() {
+	(( verbose )) && printf 'CMD: %s\n' "$*" >&2
+	(( dry_run )) || { "$@"; return $?; }
+
+	return 0
+}
+
+# handle_uri <res> <uri>
+# 1: cmd failed
+# 3: no handler
 handle_uri() {
-	local target="$1"
+	declare -n result=$1
+	declare h cmd regex target=$2
 
 	for h in "${uri_handlers[@]}"; do
 		IFS='=' read cmd regex <<< "$h"
 
-		[[ "$target" =~ ${regex} ]] && {
-			${cmd} "$target" &
+		if [[ "$target" =~ ${regex} ]]; then
+			act ${cmd} "$target"; result=$?
+			(( result )) && return 1
+
 			return 0
-		}
+		fi
 	done
 
-	return 1
+	return 3
 }
 
-handle_mime() {
+# handle_file <res> <file>
+# 1: cmd failed
+# 2: no such file
+# 3: no handler
+handle_file() {
+	declare -n result=$1
+	declare m \
+		target_mimetype charset \
+		cmd regex \
+		target=$2
+
+	[[ -e "$target" ]] || return 3
+
 	IFS=';' read target_mimetype charset <<< $( file -ib "$target" )
 
 	for m in "${mime_handlers[@]}"; do
 		IFS='=' read cmd regex <<< "$m"
 
-		[[ "$target_mimetype" =~ ${regex} ]] && {
-			${cmd} "$target" &
+		if [[ "$target_mimetype" =~ ${regex} ]]; then
+			act ${cmd} "$target"; result=$?
+			(( result )) && return 1
+
 			return 0
-		}
+		fi
 	done
 
-	return 1
+	return 3
 }
 
+# DSL
+uri() { uri_handlers+=( "$1=$2" ); }
+mime() { mime_handlers+=( "$1=$2" ); }
+
+is_uri() [[ $1 =~ ^[a-zA-Z][a-zA-Z0-9\+\.\-]+:.+ ]]
+
 main() {
-	target="$1"
+	declare cmd_result target
+
+	# Source the config file.
+	cfg_file="$HOME/.config/sx-open.cfg"
+	[[ -f "$cfg_file" ]] && { source "$cfg_file"; }
+
+	while (( $# )); do
+		case $1 in
+			(-d)
+				printf 'Dry run: not actually running the handler\n' >&2
+
+				dry_run=1
+				verbose=1
+			;;
+
+			(-h) usage; return 0;;
+
+			(-v) verbose=1;;
+
+			(--) shift; break;;
+			(*) break;;
+		esac
+
+		shift
+	done
+
+	target=$1
+
 	[[ "$target" ]] || { usage; exit; }
 
-	handle_uri "$target" || {
-		[[ "$target" =~ file://.+ ]] && { target="${target##*file://}"; }
+	# Treat file:// as local paths.
+	[[ "$target" =~ ^file:(//)?(/.+) ]] && target=${BASH_REMATCH[2]}
 
-		[[ -e "$target" ]] && {
-			[[ "$target" =~ ^/.* ]] || { target="${PWD}/${target}"; }
+	if [[ -e "$target" ]]; then
+		[[ "$target" =~ ^/.* ]] || { target="${PWD}/${target}"; } # Turn relative paths to absolute ones.
 
-			handle_mime "$target"
-		}
-	}
+		handle_file cmd_result "$target"
+	elif is_uri "$target"; then
+		handle_uri cmd_result "$target"
+	else
+		printf 'No such file or directory: %s\n' "$target" >&2
+		return 2
+	fi
 
-	[[ "$?" -gt 0 ]] && { printf "No handlers found for %s\n" "$target"; }
+	case $? in
+		(1)
+			printf 'Action failed with exit code: %s\n' "$cmd_result" >&2
+			return 4
+		;;
+
+		(3)
+			printf 'No handlers found\n' >&2
+			return 3
+		;;
+	esac
 
 	return 0
 }

sx-open.cfg

@@ -1,14 +1,12 @@
+#!syntax bash
 # Configuration file for sx-open
 # Note that as sx-open checks the regexes in order, they should be placed in order from specific to less so.
+# Format: type cmd   regex
 
-uri_handlers=(
-	'steam=^steam://.+'
-	'javaws=.+kvm.+?\.cgi$'
-	'browser=^https?://.+'
-)
+# Examples:
 
-mime_handlers=(
-	'sxiv=image/.+'
-)
+#uri browser        '^https?:'
+#uri steam          '^steam:'
 
-# vim: syntax=sh
+#mime sxiv          '^image/'
+#mime libreoffice   '^application/msword$'