Use default application to open unknown schemes

Fixes #207

CHANGELOG.md

@@ -23,6 +23,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Text no longer disappears under the left margin when scrolling (regression in v1.8.0) (#197)
 - Default search engine changed to geminispace.info from gus.guru
 - The user's terminal theme colors are used by default (#181)
+- By default, non-gemini URI schemes are opened in the default application. This requires a config change for previous users, see the [wiki](https://github.com/makeworld-the-better-one/amfora/wiki/Handling-Other-URL-Schemes) (#207)
 
 ## Removed
 - Favicon support (#199)

config/config.go

@@ -259,7 +259,7 @@ func Init() error {
 	viper.SetDefault("keybindings.bind_beginning", []string{"Home", "g"})
 	viper.SetDefault("keybindings.bind_end", []string{"End", "G"})
 	viper.SetDefault("keybindings.shift_numbers", "")
-	viper.SetDefault("url-handlers.other", "off")
+	viper.SetDefault("url-handlers.other", "default")
 	viper.SetDefault("cache.max_size", 0)
 	viper.SetDefault("cache.max_pages", 20)
 	viper.SetDefault("cache.timeout", 1800)

config/default.go

@@ -197,7 +197,9 @@ underline = true
 
 # This is a special key that defines the handler for all URL schemes for which
 # no handler is defined.
-other = 'off'
+# It uses the special value "default", which will try and use the default
+# application on your computer for opening this kind of URI.
+other = 'default'
 
 
 # [[mediatype-handlers]] section

default-config.toml

@@ -194,7 +194,9 @@ underline = true
 
 # This is a special key that defines the handler for all URL schemes for which
 # no handler is defined.
-other = 'off'
+# It uses the special value "default", which will try and use the default
+# application on your computer for opening this kind of URI.
+other = 'default'
 
 
 # [[mediatype-handlers]] section

display/handlers.go

@@ -16,6 +16,7 @@ import (
 	"github.com/makeworld-the-better-one/amfora/rr"
 	"github.com/makeworld-the-better-one/amfora/structs"
 	"github.com/makeworld-the-better-one/amfora/subscriptions"
+	"github.com/makeworld-the-better-one/amfora/sysopen"
 	"github.com/makeworld-the-better-one/amfora/webbrowser"
 	"github.com/makeworld-the-better-one/go-gemini"
 	"github.com/spf13/viper"
@@ -75,6 +76,13 @@ func handleOther(u string) {
 	switch handler {
 	case "", "off":
 		Error("URL Error", "Opening "+parsed.Scheme+" URLs is turned off.")
+	case "default":
+		_, err := sysopen.Open(u)
+		if err != nil {
+			Error("Application Error", err.Error())
+			return
+		}
+		Info("Opened in default application")
 	default:
 		// The config has a custom command to execute for URLs
 		fields := strings.Fields(handler)

sysopen/open_browser_other.go

@@ -8,5 +8,5 @@ import "fmt"
 // Open opens `path` in default system viewer, but not on this OS.
 func Open(path string) (string, error) {
 	return "", fmt.Errorf("unsupported OS for default system viewer. " +
-		"Set a catch-all [[mediatype-handlers]] command in the config")
+		"Set a catch-all command in the config")
 }

sysopen/open_browser_unix.go

@@ -21,7 +21,7 @@ func Open(path string) (string, error) {
 	switch {
 	case xorgDisplay == "" && waylandDisplay == "":
 		return "", fmt.Errorf("no display server was found. " +
-			"You may set a default [[mediatype-handlers]] command in the config")
+			"You may set a default command in the config")
 	case xdgOpenNotFoundErr == nil:
 		// Use start rather than run or output in order
 		// to make application run in background.
@@ -31,6 +31,6 @@ func Open(path string) (string, error) {
 		return "Opened in default system viewer", nil
 	default:
 		return "", fmt.Errorf("could not determine default system viewer. " +
-			"Set a catch-all [[mediatype-handlers]] command in the config")
+			"Set a catch-all command in the config")
 	}
 }