HLintRunner.java

/**
 * (c) 2011, Alejandro Serrano
 * Released under the terms of the EPL.
 */
package net.sf.eclipsefp.haskell.hlint;

import java.io.StringReader;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.List;

import net.sf.eclipsefp.haskell.hlint.parser.OutputParser;
import net.sf.eclipsefp.haskell.hlint.util.HLintText;
import net.sf.eclipsefp.haskell.util.ProcessRunner;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.runtime.IPath;
import org.eclipse.osgi.util.NLS;

/**
 * Class the encapsulates the logic of calling hlint and
 * sending the output to the parser to generate a list
 * of suggestions.
 *
 * @author Alejandro Serrano
 * @author JP Moresmau
 *
 */
public class HLintRunner {

	public static List<Suggestion> runHLintOn(IPath workingDir, IFile file) {
		StringWriter err=new StringWriter();
		StringWriter out=new StringWriter();
		try {
			
			String exe=HLintPlugin.getHlintPath();
			if (exe==null || exe.length()==0){
				exe="hlint"; // hope it's in the path
			}
			String encoding=file.getCharset(true);
			// code is 1 if we have errors!
			int code=new ProcessRunner().executeBlocking(
			    workingDir.toFile(), out, err, exe,"--encoding="+encoding, file.getLocation().toOSString());

			String s=out.toString();
			List<Suggestion> sugs=new ArrayList<>();
			if (s.length()>0){
				OutputParser parser = new OutputParser(new StringReader(s));
				sugs= parser.suggestions();
			}
			if(err.toString().length()>0){
				HLintPlugin.logError(NLS.bind(HLintText.error_run,err.toString()),null);
			} else if (code!=0 && sugs.size()==0){
				HLintPlugin.logError(NLS.bind(HLintText.error_run,out.toString()),null);
			}
			return sugs;

		} catch (Throwable ex) {
			String msg=err.toString().length()>0?err.toString():out.toString();
			HLintPlugin.logError(NLS.bind(HLintText.error_run,msg), ex);
		}
		return new ArrayList<>();
	}
}