Sub-class for CLIConfigurator that specializes in conda Python tools.

For many tools we want to integrate are Python tools that can be
run from a specific conda environment. If the implementing CLI
config knows already what is the Python command, the user should
just have to specify in what conda env it is installed.
It is more convenient than to browse to a Python executable and
less prone to error.

src/main/java/fiji/plugin/trackmate/util/cli/CondaCLIConfigurator.java

@@ -0,0 +1,59 @@
+package fiji.plugin.trackmate.util.cli;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+public class CondaCLIConfigurator extends CLIConfigurator
+{
+
+	public static final String KEY_CONDA_ENV = "CONDA_ENV";
+
+	private final ChoiceArgument condaEnv;
+
+	protected CondaCLIConfigurator()
+	{
+		super();
+
+		// Make a UI-only arg configuring the conda env.
+		// Default is last one (base is not interesting as a default).
+		final List< String > envList = CLIUtils.getEnvList();
+		this.condaEnv = addChoiceArgument()
+				.name( "Conda environment" )
+				.help( "In what conda environment is the tool installed." )
+				.addChoiceAll( envList )
+				.defaultValue( envList.get( envList.size() - 1 ) )
+				.key( KEY_CONDA_ENV )
+				.visible( true )
+				.inCLI( false )
+				.get();
+
+		// Don't show the executable arg in the UI: must be set by subclass, and
+		// only conda env required configurating.
+		getExecutableArg().visible( false );
+
+		// Add the translator to make a proper cmd line calling conda first.
+		setTranslator( getExecutableArg(), s -> {
+			final String executableName = ( String ) s;
+			// Split by spaces
+			final String[] split = executableName.split( " " );
+			final List< String > cmd = new ArrayList<>();
+			final String envname = condaEnv.getValue();
+			cmd.addAll( Arrays.asList( "cmd.exe", "/c", "conda", "activate", envname ) );
+			cmd.add( "&" );
+			cmd.addAll( Arrays.asList( split ) );
+			return cmd;
+		} );
+	}
+
+	public ChoiceArgument getCondaEnv()
+	{
+		return condaEnv;
+	}
+
+	@Override
+	public String check()
+	{
+		return checkArguments();
+	}
+}