Bug 56957 [Encoding] Reusable EncodingFieldEditor
I have added the ability to set an encoding for a repository so that commit messages and file names can be properly translated between a client and server whose encodings differ. I have extracted much of the code from IDEEditorsPreferencePage into an EncodingFieldEditor class so I could us it. I was planning on providing a patch to the UI with the hope that this class could be API but there is a roadblock that prevents this. Basically, the encoding preference is in a org.eclipse.core.Preferences node but a field editor requires an IPreferenceStore. There are already two adapters for this is the platform but one is a private inner class of AbstractUIPlugin and the other lives in the text plugin. Instead of creating a patch, I'm just attaching the EncodingFieldEditor class for future consideration.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/dialogs/ResourceInfoPage.java
IContentDescription description = getContentDescription(file);
		if (description != null) {
			IContentType contentType = description.getContentType();
			if (contentType != null)
				return contentType.getName();
		}
		return null;
	}
	private IContentDescription getContentDescription(IFile file) {
		if (cachedContentDescription == null) {
			try {
				cachedContentDescription = file.getContentDescription();
			} catch (CoreException e) {
				
			}
		}
		return cachedContentDescription;
	}
	private boolean usesDefaultEncoding(IResource resource) {
		try {
			if (resource instanceof IContainer)
				return ((IContainer) resource).getDefaultCharset(false) == null;
			if (resource instanceof IFile)
				return ((IFile) resource).getCharset(false) == null;
		} catch (CoreException e) {
		}
		return true;
	}
	private void updateEncodingState(boolean useDefault) {
		defaultEncodingButton.setSelection(useDefault);