Prepare v4 docs adding an empty migration guide

Signed-off-by: George Steel <[email protected]>

docs/book/v4/console-helper.md

@@ -0,0 +1,126 @@
+# Console Helper
+
+Writing one-off scripts or vendor binaries for a package is often problematic:
+
+- You need to parse arguments manually.
+- You need to send output to the console in a meaningful fashion:
+  - Using `STDOUT` for meaningful, expected output
+  - Using `STDERR` for error messages
+  - Ensuring any line breaks are converted to `PHP_EOL`
+  - Optionally, using console colors to provide context, which means:
+    - Detecting whether or not the console supports colors in the first place
+    - Providing appropriate escape sequences to produce color
+
+`Laminas\Stdlib\ConsoleHelper` helps to address the second major bullet point and
+all beneath it in a minimal fashion.
+
+## Usage
+
+Typical usage is to instantiate a `ConsoleHelper`, and call one of its methods:
+
+```php
+use Laminas\Stdlib\ConsoleHelper;
+
+$helper = new ConsoleHelper();
+$helper->writeLine('This is output');
+```
+
+You can optionally pass a PHP stream resource to the constructor, which will be
+used to determine whether or not color support is available:
+
+```php
+$helper = new ConsoleHelper($stream);
+```
+
+By default, it assumes `STDOUT`, and tests against that.
+
+## Available methods
+
+`ConsoleHelper` provides the following methods.
+
+### colorize
+
+- `colorize(string $string) : string`
+
+`colorize()` accepts a formatted string, and will then apply ANSI color
+sequences to them, if color support is detected.
+
+The following sequences are currently supported:
+
+- `<info>...</info>` will apply a green color sequence around the provided text.
+- `<error>...</error>` will apply a red color sequence around the provided text.
+
+You may mix multiple sequences within the same stream.
+
+### write
+
+- `write(string $string, bool $colorize = true, resource $stream = STDOUT) : void`
+
+Emits the provided `$string` to the provided `$stream` (which defaults to
+`STDOUT` if not provided). Any EOL sequences are convered to `PHP_EOL`. If
+`$colorize` is `true`, the string is first passed to `colorize()` as well.
+
+### writeline
+
+- `writeLine(string $string, bool $colorize = true, resource $stream = STDOUT) : void`
+
+Same as `write()`, except it also appends a `PHP_EOL` sequence to the `$string`.
+
+### writeErrorMessage
+
+- `writeErrorMessage(string $message)`
+
+Wraps `$message` in an `<error></error>` sequence, and passes it to
+`writeLine()`, using `STDERR` as the `$stream`.
+
+## Example
+
+Below is an example class that accepts an argument list, and determines how and
+what to emit.
+
+```php
+namespace Foo;
+
+use Laminas\Stdlib\ConsoleHelper;
+
+class HelloWorld
+{
+    private $helper;
+
+    public function __construct(ConsoleHelper $helper = null)
+    {
+        $this->helper = $helper ?: new ConsoleHelper();
+    }
+
+    public function __invoke(array $args)
+    {
+        if (! count($args)) {
+            $this->helper->writeErrorMessage('Missing arguments!');
+            return;
+        }
+
+        if (count($args) > 1) {
+            $this->helper->writeErrorMessage('Too many arguments!');
+            return;
+        }
+
+        $target = array_shift($args);
+
+        $this->helper->writeLine(sprintf(
+            '<info>Hello</info> %s',
+            $target
+        ));
+    }
+}
+```
+
+## When to upgrade
+
+`ConsoleHelper` is deliberately simple, and assumes that your primary need for
+console tooling is for output considerations.
+
+If you need to parse complex argument strings, we recommend using
+[laminas-console](https://docs.laminas.dev/laminas-console/)/[zf-console](https://github.com/zfcampus/zf-console)
+or [symfony/console](http://symfony.com/doc/current/components/console.html),
+as these packages provide those capabilities, as well as far more colorization
+and console feature detection facilities.

docs/book/v4/migration.md

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+# Migration Guide
+
+## From v3 to v4
+
+Version 4 of `laminas-stdlib` contains a number of backwards incompatible changes. This guide is intended to help you upgrade from the version 3 series to version 4.

mkdocs.yml

@@ -5,16 +5,20 @@ nav:
     - v3:
       - "Console Helper": v3/console-helper.md
       - Migration: v3/migration.md
+    - v4:
+        - "Console Helper": v4/console-helper.md
+        - Migration: v4/migration.md
 site_name: laminas-stdlib
 site_description: Laminas\Stdlib
 repo_url: 'https://github.com/laminas/laminas-stdlib'
 extra:
     project: Components
-    current_version: v3
+    current_version: v4
     versions:
       - v3
+      - v4
 plugins:
   - redirects:
       redirect_maps:
-        migration.md: v3/migration.md
-        console-helper.md: v3/console-helper.md
+        migration.md: v4/migration.md
+        console-helper.md: v4/console-helper.md