preprocessor tool

src/org/p4/p4plugin/preprocessor/P4PreprocessorUtil.java

@@ -0,0 +1,55 @@
+package org.p4.p4plugin.preprocessor;
+
+import com.intellij.openapi.vfs.LocalFileSystem;
+import com.intellij.openapi.vfs.VirtualFile;
+import org.p4.p4plugin.P4PluginConfig;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.File;
+import java.io.IOException;
+
+public class P4PreprocessorUtil {
+    private static final Logger log = LoggerFactory.getLogger(P4PreprocessorUtil.class);
+    private static final String TEMP_OUTPUT_DIR = "/tmp/p4tmp";
+
+    public static VirtualFile getLatestPreprocessedFile(VirtualFile sourceFile) {
+        String tempFilePath = String.format("%s/%s",
+                                            TEMP_OUTPUT_DIR,
+                                            sourceFile.getName());
+        File tempOutputFile = new File(tempFilePath);
+        if (!tempOutputFile.exists()) return null;
+        return LocalFileSystem.getInstance().findFileByIoFile(tempOutputFile);
+    }
+
+    public static VirtualFile preprocessP4File(VirtualFile sourceFile) {
+        String[] includePaths = P4PluginConfig.readConfig()
+                .getOrDefault(P4PluginConfig.P4_INCLUDE_PATH_KEY, "").split(";");
+
+        StringBuilder includePathArgs = new StringBuilder();
+        for (String path : includePaths) {
+            includePathArgs.append("-I ");
+            includePathArgs.append(path);
+        }
+
+        String tempFilePath = String.format("%s/%s",
+                                            TEMP_OUTPUT_DIR,
+                                            sourceFile.getName());
+
+
+
+        String cmd = String.format("cc -E -x c %s -o %s %s", includePathArgs.toString(),
+                                   tempFilePath, sourceFile.getPath());
+
+        try {
+            log.info("executing {}", cmd);
+            Process p = Runtime.getRuntime().exec(cmd);
+            p.waitFor();
+            File tempOutputFile = new File(tempFilePath);
+            return LocalFileSystem.getInstance().findFileByIoFile(tempOutputFile);
+        } catch (IOException | InterruptedException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+}