CLI: Add --version to CLI option (#7549)

* CLI: Add --version to CLI option

I added to get the Arduino IDE version from the command line
It will allow to check easily if the new Arduino is already installed.

This feature makes it easier to build external systems linked to specific versions of Arduino.

1. I added `--version` action, which shows version name and exit
  1. Currently, VERSION_NAME_LONG (like `1.8.5`, `1.9.0-beta`, `1.8.6 Hourly Build XXX`, etc...) is used. Because I want to know its version number and stable/beta/hourly.
  2. Finish with `0`. Because it is `SUCCESSFLLY FINISHED`.
2. Updated man page.

* Split "parse" and "action".
Move print action to probably suitable place.

This commit will fix the behavior of multiple actions about --version.

* add testcase

app/src/processing/app/Base.java

@@ -487,6 +487,9 @@ public class Base {
       System.exit(0);
     } else if (parser.isGetPrefMode()) {
       BaseNoGui.dumpPrefs(parser);
+    } else if (parser.isVersionMode()) {
+      System.out.print("Arduino: " + BaseNoGui.VERSION_NAME_LONG);
+      System.exit(0);
     }
   }
 

app/test/processing/app/CommandLineTest.java

@@ -34,6 +34,7 @@ import static org.junit.Assert.*;
 import java.io.File;
 
 import org.apache.commons.compress.utils.IOUtils;
+import org.fest.assertions.Assertions;
 import org.junit.Before;
 import org.junit.Test;
 
@@ -126,5 +127,36 @@ public class CommandLineTest {
 
     prefs = new PreferencesMap(prefFile);
     assertEquals("preference should be saved", "xxx", prefs.get("test_pref"));
-}
+  }
+
+  @Test
+  public void testCommandLineVersion() throws Exception {
+    Runtime rt = Runtime.getRuntime();
+    Process pr = rt.exec(new String[]{
+      arduinoPath.getAbsolutePath(),
+      "--version",
+    });
+    pr.waitFor();
+
+    Assertions.assertThat(pr.exitValue())
+      .as("Process will finish with exit code 0 in --version")
+      .isEqualTo(0);
+    Assertions.assertThat(new String(IOUtils.toByteArray(pr.getInputStream())))
+      .matches("Arduino: \\d+\\.\\d+\\.\\d+.*");
+  }
+
+  @Test
+  public void testCommandLineMultipleAction() throws Exception {
+    Runtime rt = Runtime.getRuntime();
+    Process pr = rt.exec(new String[]{
+      arduinoPath.getAbsolutePath(),
+      "--version",
+      "--verify",
+    });
+    pr.waitFor();
+
+    Assertions.assertThat(pr.exitValue())
+      .as("Multiple Action will be rejected")
+      .isEqualTo(3);
+  }
 }

arduino-core/src/processing/app/helpers/CommandlineParser.java

@@ -16,7 +16,7 @@ import static processing.app.I18n.tr;
 public class CommandlineParser {
 
   private enum ACTION {
-    GUI, NOOP, VERIFY("--verify"), UPLOAD("--upload"), GET_PREF("--get-pref"), INSTALL_BOARD("--install-boards"), INSTALL_LIBRARY("--install-library");
+    GUI, NOOP, VERIFY("--verify"), UPLOAD("--upload"), GET_PREF("--get-pref"), INSTALL_BOARD("--install-boards"), INSTALL_LIBRARY("--install-library"), VERSION("--version");
 
     final String value;
 
@@ -52,6 +52,7 @@ public class CommandlineParser {
     actions.put("--get-pref", ACTION.GET_PREF);
     actions.put("--install-boards", ACTION.INSTALL_BOARD);
     actions.put("--install-library", ACTION.INSTALL_LIBRARY);
+    actions.put("--version", ACTION.VERSION);
   }
 
   public void parseArgumentsPhase1() {
@@ -340,6 +341,10 @@ public class CommandlineParser {
     return action == ACTION.INSTALL_LIBRARY;
   }
 
+  public boolean isVersionMode() {
+    return action == ACTION.VERSION;
+  }
+
   public String getBoardToInstall() {
     return this.boardToInstall;
   }

build/shared/manpage.adoc

@@ -33,6 +33,8 @@ SYNOPSIS
 
 *arduino* [*--install-library* __library name__[:__version__][,__library name__[:__version__],__library name__[:__version__]]
 
+*arduino* [*--version*]
+
 DESCRIPTION
 -----------
 The 'arduino' integrated development environment allows editing,
@@ -83,6 +85,9 @@ ACTIONS
 	Fetches available libraries list and install the specified one. If __version__ is omitted, the latest is installed. If a library with the same version is already installed, nothing is installed and program exits with exit code 1. If a library with a different version is already installed, it's replaced.
 	Multiple libraries can be specified, separated by a comma.
 
+*--version*::
+	Print the version information and exit.
+
 OPTIONS
 -------
 *--board* __package__:__arch__:__board__[:__parameters__]::