225 lines
9.9 KiB
C#
225 lines
9.9 KiB
C#
//===-- ClangFormatPackages.cs - VSPackage for clang-format ------*- C# -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This class contains a VS extension package that runs clang-format over a
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// selection in a VS text editor.
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//
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//===----------------------------------------------------------------------===//
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using Microsoft.VisualStudio.Editor;
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using Microsoft.VisualStudio.Shell;
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using Microsoft.VisualStudio.Shell.Interop;
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using Microsoft.VisualStudio.Text;
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using Microsoft.VisualStudio.Text.Editor;
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using Microsoft.VisualStudio.TextManager.Interop;
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using System;
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using System.ComponentModel;
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using System.ComponentModel.Design;
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using System.IO;
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using System.Reflection;
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using System.Runtime.InteropServices;
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using System.Xml.Linq;
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namespace LLVM.ClangFormat
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{
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[ClassInterface(ClassInterfaceType.AutoDual)]
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[CLSCompliant(false), ComVisible(true)]
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public class OptionPageGrid : DialogPage
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{
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private string style = "File";
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[Category("LLVM/Clang")]
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[DisplayName("Style")]
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[Description("Coding style, currently supports:\n" +
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" - Predefined styles ('LLVM', 'Google', 'Chromium', 'Mozilla').\n" +
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" - 'File' to search for a YAML .clang-format or _clang-format\n" +
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" configuration file.\n" +
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" - A YAML configuration snippet.\n\n" +
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"'File':\n" +
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" Searches for a .clang-format or _clang-format configuration file\n" +
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" in the source file's directory and its parents.\n\n" +
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"YAML configuration snippet:\n" +
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" The content of a .clang-format configuration file, as string.\n" +
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" Example: '{BasedOnStyle: \"LLVM\", IndentWidth: 8}'\n\n" +
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"See also: http://clang.llvm.org/docs/ClangFormatStyleOptions.html.")]
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public string Style
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{
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get { return style; }
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set { style = value; }
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}
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}
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[PackageRegistration(UseManagedResourcesOnly = true)]
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[InstalledProductRegistration("#110", "#112", "1.0", IconResourceID = 400)]
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[ProvideMenuResource("Menus.ctmenu", 1)]
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[Guid(GuidList.guidClangFormatPkgString)]
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[ProvideOptionPage(typeof(OptionPageGrid), "LLVM/Clang", "ClangFormat", 0, 0, true)]
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public sealed class ClangFormatPackage : Package
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{
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#region Package Members
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protected override void Initialize()
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{
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base.Initialize();
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var commandService = GetService(typeof(IMenuCommandService)) as OleMenuCommandService;
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if (commandService != null)
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{
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var menuCommandID = new CommandID(GuidList.guidClangFormatCmdSet, (int)PkgCmdIDList.cmdidClangFormat);
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var menuItem = new MenuCommand(MenuItemCallback, menuCommandID);
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commandService.AddCommand(menuItem);
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}
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}
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#endregion
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private void MenuItemCallback(object sender, EventArgs args)
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{
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IWpfTextView view = GetCurrentView();
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if (view == null)
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// We're not in a text view.
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return;
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string text = view.TextBuffer.CurrentSnapshot.GetText();
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int start = view.Selection.Start.Position.GetContainingLine().Start.Position;
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int end = view.Selection.End.Position.GetContainingLine().End.Position;
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int length = end - start;
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// clang-format doesn't support formatting a range that starts at the end
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// of the file.
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if (start >= text.Length && text.Length > 0)
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start = text.Length - 1;
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string path = GetDocumentParent(view);
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try
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{
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var root = XElement.Parse(RunClangFormat(text, start, length, path));
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var edit = view.TextBuffer.CreateEdit();
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foreach (XElement replacement in root.Descendants("replacement"))
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{
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var span = new Span(
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int.Parse(replacement.Attribute("offset").Value),
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int.Parse(replacement.Attribute("length").Value));
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edit.Replace(span, replacement.Value);
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}
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edit.Apply();
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}
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catch (Exception e)
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{
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var uiShell = (IVsUIShell)GetService(typeof(SVsUIShell));
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var id = Guid.Empty;
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int result;
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uiShell.ShowMessageBox(
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0, ref id,
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"Error while running clang-format:",
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e.Message,
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string.Empty, 0,
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OLEMSGBUTTON.OLEMSGBUTTON_OK,
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OLEMSGDEFBUTTON.OLEMSGDEFBUTTON_FIRST,
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OLEMSGICON.OLEMSGICON_INFO,
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0, out result);
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}
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}
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/// <summary>
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/// Runs the given text through clang-format and returns the replacements as XML.
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///
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/// Formats the text range starting at offset of the given length.
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/// </summary>
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private string RunClangFormat(string text, int offset, int length, string path)
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{
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string vsixPath = Path.GetDirectoryName(
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typeof(ClangFormatPackage).Assembly.Location);
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System.Diagnostics.Process process = new System.Diagnostics.Process();
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process.StartInfo.UseShellExecute = false;
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process.StartInfo.FileName = vsixPath + "\\clang-format.exe";
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// Poor man's escaping - this will not work when quotes are already escaped
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// in the input (but we don't need more).
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string style = GetStyle().Replace("\"", "\\\"");
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process.StartInfo.Arguments = " -offset " + offset +
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" -length " + length +
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" -output-replacements-xml " +
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" -style \"" + style + "\"";
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process.StartInfo.CreateNoWindow = true;
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process.StartInfo.RedirectStandardInput = true;
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process.StartInfo.RedirectStandardOutput = true;
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process.StartInfo.RedirectStandardError = true;
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if (path != null)
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process.StartInfo.WorkingDirectory = path;
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// We have to be careful when communicating via standard input / output,
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// as writes to the buffers will block until they are read from the other side.
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// Thus, we:
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// 1. Start the process - clang-format.exe will start to read the input from the
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// standard input.
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try
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{
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process.Start();
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}
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catch (Exception e)
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{
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throw new Exception(
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"Cannot execute " + process.StartInfo.FileName + ".\n\"" +
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e.Message + "\".\nPlease make sure it is on the PATH.");
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}
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// 2. We write everything to the standard output - this cannot block, as clang-format
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// reads the full standard input before analyzing it without writing anything to the
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// standard output.
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process.StandardInput.Write(text);
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// 3. We notify clang-format that the input is done - after this point clang-format
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// will start analyzing the input and eventually write the output.
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process.StandardInput.Close();
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// 4. We must read clang-format's output before waiting for it to exit; clang-format
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// will close the channel by exiting.
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string output = process.StandardOutput.ReadToEnd();
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// 5. clang-format is done, wait until it is fully shut down.
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process.WaitForExit();
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if (process.ExitCode != 0)
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{
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// FIXME: If clang-format writes enough to the standard error stream to block,
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// we will never reach this point; instead, read the standard error asynchronously.
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throw new Exception(process.StandardError.ReadToEnd());
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}
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return output;
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}
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/// <summary>
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/// Returns the currently active view if it is a IWpfTextView.
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/// </summary>
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private IWpfTextView GetCurrentView()
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{
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// The SVsTextManager is a service through which we can get the active view.
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var textManager = (IVsTextManager)Package.GetGlobalService(typeof(SVsTextManager));
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IVsTextView textView;
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textManager.GetActiveView(1, null, out textView);
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// Now we have the active view as IVsTextView, but the text interfaces we need
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// are in the IWpfTextView.
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var userData = (IVsUserData)textView;
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if (userData == null)
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return null;
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Guid guidWpfViewHost = DefGuidList.guidIWpfTextViewHost;
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object host;
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userData.GetData(ref guidWpfViewHost, out host);
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return ((IWpfTextViewHost)host).TextView;
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}
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private string GetStyle()
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{
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var page = (OptionPageGrid)GetDialogPage(typeof(OptionPageGrid));
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return page.Style;
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}
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private string GetDocumentParent(IWpfTextView view)
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{
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ITextDocument document;
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if (view.TextBuffer.Properties.TryGetProperty(typeof(ITextDocument), out document))
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{
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return Directory.GetParent(document.FilePath).ToString();
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}
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return null;
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}
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}
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}
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