add browser option to config

Allows setting the path to the browser using the config.

Closes #858

internal/config/config_type.go

@@ -8,8 +8,8 @@ import (
 
 // This interface describes interacting with some persistent configuration for gh.
 type Config interface {
-	Get(string, string) (string, error)
-	GetWithSource(string, string) (string, string, error)
+	Get(hostname string, key string) (string, error)
+	GetWithSource(hostname string, key string) (string, string, error)
 	Set(string, string, string) error
 	UnsetHost(string)
 	Hosts() ([]string, error)
@@ -55,6 +55,11 @@ var configOptions = []ConfigOption{
 		Description:  "the path to a unix socket through which to make HTTP connection",
 		DefaultValue: "",
 	},
+	{
+		Key:          "browser",
+		Description:  "the path to the browser to use when opening URLs",
+		DefaultValue: "",
+	},
 }
 
 func ConfigOptions() []ConfigOption {

pkg/cmd/factory/default.go

@@ -89,8 +89,21 @@ func httpClientFunc(f *cmdutil.Factory, appVersion string) func() (*http.Client,
 	}
 }
 
+// browser returns the path to the browser. Attempts to read a path from Config,
+// and falls back to the $BROWSER env var if Config value is blank.
 func browser(f *cmdutil.Factory) cmdutil.Browser {
 	io := f.IOStreams
+
+	cfg, err := f.Config()
+	if err != nil {
+		fmt.Fprintf(io.ErrOut, "problem loading config %s", err)
+	}
+
+	fromConfig, err := cfg.Get("", "browser")
+	if err == nil && fromConfig != "" {
+		return cmdutil.NewBrowser(fromConfig, io.Out, io.ErrOut)
+	}
+
 	return cmdutil.NewBrowser(os.Getenv("BROWSER"), io.Out, io.ErrOut)
 }