FileStatusBarPluginをカスタマイズして，使っている改行コードを表示するようにしたもの。

FileStatusBarPlugin.java

package com.siyeh.filestatusbar;

import com.intellij.openapi.components.ProjectComponent;
import com.intellij.openapi.fileEditor.FileEditorManager;
import com.intellij.openapi.fileEditor.FileEditorManagerEvent;
import com.intellij.openapi.fileEditor.FileEditorManagerListener;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.io.FileUtil;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.openapi.wm.StatusBar;
import com.intellij.openapi.wm.WindowManager;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;

public class FileStatusBarPlugin implements ProjectComponent, FileEditorManagerListener {
  private final Project project;

  public FileStatusBarPlugin(Project project) {
    super();
    this.project = project;
  }

  public void projectOpened() {
    final FileEditorManager fileEditorManager =
        FileEditorManager.getInstance(project);
    fileEditorManager.addFileEditorManagerListener(this);
  }

  public void projectClosed() {
    final FileEditorManager fileEditorManager =
        FileEditorManager.getInstance(project);
    fileEditorManager.removeFileEditorManagerListener(this);
  }

  public String getComponentName() {
    return "FileStatusBar";
  }

  public void initComponent() {
  }

  public void disposeComponent() {
  }


  public void fileOpened(FileEditorManager fileEditorManager, VirtualFile virtualFile) {
    populateStatusBar(virtualFile);
  }

  public void fileClosed(FileEditorManager fileEditorManager, VirtualFile virtualFile) {

  }

  public void selectionChanged(FileEditorManagerEvent event) {
    final VirtualFile virtualFile = event.getNewFile();
    populateStatusBar(virtualFile);
  }

  private void populateStatusBar(VirtualFile virtualFile) {
    final WindowManager windowManager = WindowManager.getInstance();
    final StatusBar statusBar = windowManager.getStatusBar(project);
    if (virtualFile == null) {
      statusBar.setInfo("");
    }
    else {
      final String path = virtualFile.getPath();
      final File file = new File(path);
      final String fileName = file.getName();
      if (file.exists()) {
        final long length = file.length();
        final boolean isBinary = virtualFile.getFileType().isBinary();
        final String linebreak = isBinary ? "binary"
                                          : getLineBreak(file, virtualFile.getCharset().displayName());
        String output = String.format("%s, %,d byte(s), [%s], %tY-%<tm-%<td %<tH:%<tM:%<tS", fileName, length, linebreak, file.lastModified());
        statusBar.setInfo(output);
      }
      else {
        statusBar.setInfo("");
      }
    }
  }

  private String getLineBreak(File file, String enc) {
    String lineBreak = "???";
    try {
      Reader reader = new InputStreamReader(new FileInputStream(file), enc);
      // とりあえず 1024byte 読み込んで改行コードをチェックする
      char[] chars = FileUtil.loadText(reader, 1024);
      reader.close();
      for (int i = 0; i < chars.length; i++) {
        if ('\n' == chars[i]) {
          lineBreak = "unix";
          break;
        }
        else if ('\r' == chars[i]) {
          if (i + 1 < chars.length && '\n' == chars[i + 1]) {
            lineBreak = "windows";
            break;
          }
          else {
            lineBreak = "mac";
            break;
          }
        }
      }
    }
    catch (IOException ignore) {}
    return lineBreak;
  }
}

<idea-plugin version="2">
  <name>File Status Bar Plugin(custom)</name>
  <description></description>
  <version>1.0</version>
  <vendor>masanobu imai</vendor>

  <!-- please see http://confluence.jetbrains.net/display/IDEADEV/Build+Number+Ranges for description -->
  <idea-version since-build="107.105"/>

  <project-components>
    <component>
      <interface-class>com.siyeh.filestatusbar.FileStatusBarPlugin</interface-class>
      <implementation-class>com.siyeh.filestatusbar.FileStatusBarPlugin</implementation-class>
    </component>
  </project-components>
</idea-plugin>