Add aliases to pasta client

Add configurable aliases to the pasta client. Aliases for remote
instances can be put into the ~/.pasta.toml file and defined via the
remote program parameter.

cmd/pasta/pasta.go

@@ -18,11 +18,33 @@ import (
 )
 
 type Config struct {
-	RemoteHost string `toml:"RemoteHost"`
+	RemoteHost  string       `toml:"RemoteHost"`
+	RemoteHosts []RemoteHost `toml:"Remote"`
+}
+type RemoteHost struct {
+	URL     string   `toml:"url"`     // URL of the remote host
+	Alias   string   `toml:"alias"`   // Alias for the remote host
+	Aliases []string `toml:"aliases"` // List of additional aliases for the remote host
 }
 
 var cf Config
 
+// Search for the given remote alias. Returns true and the remote if found, otherwise false and an empty instance
+func (cf *Config) FindRemoteAlias(remote string) (bool, RemoteHost) {
+	for _, remote := range cf.RemoteHosts {
+		if cf.RemoteHost == remote.Alias {
+			return true, remote
+		}
+		for _, alias := range remote.Aliases {
+			if cf.RemoteHost == alias {
+				return true, remote
+			}
+		}
+	}
+	var ret RemoteHost
+	return false, ret
+}
+
 /* http error instance */
 type HttpError struct {
 	err        string
@@ -45,7 +67,7 @@ func usage() {
 	fmt.Printf("Usage: %s [OPTIONS] [FILE,[FILE2,...]]\n\n", os.Args[0])
 	fmt.Println("OPTIONS")
 	fmt.Println("     -h, --help                 Print this help message")
-	fmt.Println("     -r, --remote HOST          Define remote host (Default: http://localhost:8199)")
+	fmt.Println("     -r, --remote HOST          Define remote host or alias (Default: http://localhost:8199)")
 	fmt.Println("     -c, --config FILE          Define config file (Default: ~/.pasta.toml)")
 	fmt.Println("     -f, --file FILE            Send FILE to server")
 	fmt.Println("")
@@ -168,9 +190,14 @@ func main() {
 			files = append(files, arg)
 		}
 	}
+	if found, remote := cf.FindRemoteAlias(cf.RemoteHost); found {
+		fmt.Fprintf(os.Stderr, "Alias found: %s for %s\n", cf.RemoteHost, remote.URL)
+		cf.RemoteHost = remote.URL
+	}
 	// Sanity checks
 	if strings.Index(cf.RemoteHost, "://") < 0 {
-		cf.RemoteHost = "http://" + cf.RemoteHost
+		fmt.Fprintf(os.Stderr, "Invalid remote: %s\n", cf.RemoteHost)
+		os.Exit(1)
 	}
 	// Load stored pastas
 	stor, err := OpenStorage(homeDir + "/.pastas.dat")

pasta.toml.example

@@ -2,3 +2,16 @@
 # Place this file in ~/.pasta.toml
 
 RemoteHost = "http://localhost:8199"
+
+# Example for a remote with one alias
+# aliases can be given to `pasta` as a remote argument and will be
+#   completed to the given url
+[[Remote]]
+url = "http://localhost:8199"
+alias = "localhost"
+
+# Example of a remote with multiple aliases
+[[Remote]]
+url = ""http://localhost:8200"
+alias = "localhost2"          # one alias
+aliases = ["local2", "loc2"]  # more aliases