如何在编辑器中检测P4V的工作区切换操作？

Hey Alex, great question—there are definitely ways to detect P4V workspace switches directly in your editor, no need to rely on P4V notifications. Here are some practical approaches you can implement:

• Periodically check workspace info via Perforce CLI
  Your editor can run the p4 info command at regular intervals (e.g., every 30 seconds, or when you focus the editor window) to fetch the current workspace details. The output includes a Stream: field that tells you which stream the workspace is mapped to. Store the last known stream value in your editor's state, and if the new value doesn't match, trigger a notification or update the editor's context.
  For example, in VS Code, you could write a small extension that uses the built-in process API to execute p4 info, parse the output with a regex like /Stream:\s+(.*)/, and compare against the cached value.

• Watch for changes to Perforce config files
  When you switch workspaces in P4V, it updates your Perforce configuration files (like the P4CONFIG file, often named .p4config in your workspace root). Your editor can set up a file system watcher to monitor this file for modifications. When a change is detected, re-run p4 info or p4 client -o to get the updated workspace/stream info.
  Most modern editors have APIs for this—for instance, JetBrains IDEs let you use FileWatcher to track config files, while VS Code uses workspace.createFileSystemWatcher.

• Leverage editor Perforce plugin hooks
  If your editor already has a Perforce integration plugin (like the official Perforce plugin for VS Code or JetBrains IDEs), check if it exposes events or APIs that let you hook into workspace changes. Some plugins already track workspace state internally, so you can add custom logic to listen for when that state changes and alert you or update the editor's context.
  For example, in JetBrains IDEs, you can use the PerforceVcs API to get the current workspace and subscribe to changes in the VCS state.

• Validate workspace per open file
  Whenever you open or switch to a file in the editor, run p4 where <file-path> to get the stream associated with that file. Compare this stream to the last known workspace stream—if they differ, it means you've switched workspaces (or opened a file from a different workspace). This is especially useful if you keep multiple workspaces open in the editor at once.
  The p4 where command returns output like //depot/stream/path/file.txt //my-workspace/path/file.txt /local/path/file.txt, so you can extract the depot stream part to compare.

A few things to keep in mind:

• Don't run CLI commands too frequently (e.g., avoid checking every second) to prevent performance hits.
• Make sure your editor has access to the p4 command in its PATH—you might need to configure the editor's environment variables if it doesn't inherit your system PATH.
• For some editors, you might need to enable file system watcher permissions (especially on macOS or Linux with strict sandboxing).

内容的提问来源于stack exchange，提问作者perryperry