Initial commit

.classpath

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+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" output="target/classes" path="src/main/java">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry excluding="**" kind="src" output="target/classes" path="src/main/resources">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="src" output="target/test-classes" path="src/test/java">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry excluding="**" kind="src" output="target/test-classes" path="src/test/resources">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="output" path="target/classes"/>
+</classpath>

.gitignore

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+/target/

.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>bibtex-generator</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.m2e.core.maven2Builder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+		<nature>org.eclipse.m2e.core.maven2Nature</nature>
+	</natures>
+</projectDescription>

.settings/org.eclipse.jdt.core.prefs

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+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
+org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
+org.eclipse.jdt.core.compiler.compliance=1.8
+org.eclipse.jdt.core.compiler.debug.lineNumber=generate
+org.eclipse.jdt.core.compiler.debug.localVariable=generate
+org.eclipse.jdt.core.compiler.debug.sourceFile=generate
+org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
+org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
+org.eclipse.jdt.core.compiler.source=1.8

.settings/org.eclipse.m2e.core.prefs

@@ -0,0 +1,4 @@
+activeProfiles=
+eclipse.preferences.version=1
+resolveWorkspaceProjects=true
+version=1

pom.xml

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+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<groupId>nl.cwi</groupId>
+	<artifactId>bibtex-generator</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+
+	<properties>
+		<maven.compiler.source>1.8</maven.compiler.source>
+		<maven.compiler.target>1.8</maven.compiler.target>
+	</properties>
+
+	<dependencies>
+		<dependency>
+			<groupId>commons-io</groupId>
+			<artifactId>commons-io</artifactId>
+			<version>2.6</version>
+		</dependency>
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-assembly-plugin</artifactId>
+				<configuration>
+					<archive>
+						<manifest>
+							<mainClass>nl.cwi.BibTeXGenerator</mainClass>
+						</manifest>
+					</archive>
+					<descriptorRefs>
+						<descriptorRef>jar-with-dependencies</descriptorRef>
+					</descriptorRefs>
+					<finalName>bibgen</finalName>
+					<appendAssemblyId>false</appendAssemblyId>
+					<attach>false</attach>
+					<outputDirectory>${project.basedir}/target</outputDirectory>
+				</configuration>
+				<executions>
+					<execution>
+						<id>make-assembly</id>
+						<phase>package</phase>
+						<goals>
+							<goal>single</goal>
+						</goals>
+					</execution>
+				</executions>
+			</plugin>
+		</plugins>
+	</build>
+</project>

src/main/java/nl/cwi/BibTeXGenerator.java

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+package nl.cwi;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.Set;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class BibTeXGenerator {
+
+    public static String NOKEY = "BibTex key %s could not be retrieved from DBLP.%n";
+
+    public static String FNF = "File %s could not be found.%n";
+
+    public static String IOE = "I/O exception occured while reading %s.%n";
+
+    public static String NAF = "Argument %s is not a file.%n";
+
+    public static String USAGE = "BibTeX generator.\nUsage: bibgen <tex-file>";
+
+    public static void main(String[] args) {
+
+	if (args.length != 1) {
+	    System.out.println(USAGE);
+	    return;
+	}
+
+	File file = new File(args[0]);
+	if (!file.isFile() || !file.getName().endsWith(".tex")) {
+	    System.err.printf(NAF, args[0]);
+	    return;
+	}
+
+	for (String key : getKeys(file))
+	    printEntry(key);
+    }
+
+    private static void printEntry(String key) {
+	String url = key.replaceFirst("DBLP:", "http://dblp.uni-trier.de/rec/bib2/") + ".bib";
+	try {
+	    URL website = new URL(url);
+	    try (InputStream is = website.openStream();) {
+		BufferedReader in = new BufferedReader(new InputStreamReader(is));
+		String inputLine;
+		while ((inputLine = in.readLine()) != null)
+		    System.out.println(inputLine);
+	    } catch (IOException e) {
+		System.err.printf(NOKEY, key);
+	    }
+	} catch (MalformedURLException e) {
+	    System.err.printf(NOKEY, key);
+	}
+    }
+
+    private static Set<String> getKeys(File texfile) {
+	Set<String> refs = new HashSet<>();
+	Pattern p = Pattern.compile("cite\\{[^{},]+(,[^{},]+)*");
+
+	try (BufferedReader br = new BufferedReader(new FileReader(texfile))) {
+	    String line;
+	    while ((line = br.readLine()) != null) {
+		Matcher m = p.matcher(line);
+		while (m.find())
+		    refs.addAll(Arrays.asList(m.group().substring(5).split("\\s*,\\s*")));
+	    }
+	} catch (FileNotFoundException e) {
+	    System.err.printf(FNF, texfile.getName());
+	} catch (IOException e) {
+	    System.err.printf(IOE, texfile.getName());
+	}
+	return refs;
+    }
+}