adds shell.Process to readme

problem: 
- not all last changes are reflected in the readme, eg shell.Process

solution: 
- document it in Readme
- document it in the CHANGES.dm
- add it to example/main.go

Author: mindreframer

CHANGES.md

@@ -1,5 +1,9 @@
 For now, dates (DD/MM/YYYY) are used until ishell gets stable enough to warrant tags.
 Attempts will be made to ensure non breaking updates as much as possible.
+#### 28/05/2017
+* Added `shell.Process(os.Args[1:]...)` for non-interactive execution
+*
+
 
 #### 07/02/2016
 Added multiline support to shell mode.

README.md

@@ -213,6 +213,32 @@ ishell.ProgressBar().Display(display)
 shell.SetHomeHistoryPath(".ishell_history")
 ```
 
+
+### Non-interactive execution
+In some situations it is desired to exit the program directly after executing a single command.
+
+```go
+// when started with "exit" as first argument, assume non-interactive execution
+if len(os.Args) > 1 && os.Args[1] == "exit" {
+    shell.Process(os.Args[2:]...)
+} else {
+    // start shell
+    shell.Run()
+}
+```
+
+```bash
+# Run normally - interactive mode:
+$ go run main.go
+... interactive shell
+
+# Run non-interactivelly
+$ go run main.go exit greet Someusername
+> Sample Interactive Shell
+> Hello Someusername
+```
+
+
 ### Example
 Available [here](https://github.com/abiosoft/ishell/blob/master/example/main.go).
 ```sh
@@ -252,6 +278,7 @@ Library | Use
 [github.com/flynn-archive/go-shlex](http://github.com/flynn-archive/go-shlex) | splitting input into command and args.
 [github.com/chzyer/readline](github.com/chzyer/readline) | readline capabilities.
 
+
 ## Donate
 ```
 bitcoin:1GTHYEDiy2C7RzXn5nY4wVRaEN2GvLjwZN

example/main.go

@@ -3,6 +3,7 @@ package main
 import (
 	"errors"
 	"fmt"
+	"os"
 	"strings"
 	"time"
 
@@ -169,9 +170,13 @@ This is another line of it.
 		},
 	})
 
-	// start shell
-	shell.Run()
-
-	// teardown
-	shell.Close()
+	// when started with "exit" as first argument, assume non-interactive execution
+	if len(os.Args) > 1 && os.Args[1] == "exit" {
+		shell.Process(os.Args[2:]...)
+	} else {
+		// start shell
+		shell.Run()
+		// teardown
+		shell.Close()
+	}
 }