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Watchman purpose is to watch files and record when there are changes. It can trigger actions (rebuilding assets, for example) when there is a change in matching files. The watchman executable has both the client and the server components of the watchman service. When running watchman, it will attempt to communicate with your existing server instance (each user has their own persistent process), and will attempt to start it if it doesn’t exist. There are some options that affect how watchman will locate the server, some options that affect only the client and some others that affect only the server. Since all of the options are understood by the same executable we’ve broken those out into sections of their own to make it clearer when they apply. Watchman is conservative, preferring to err on the side of caution; it considers files to be freshly changed when you start to watch them or when it is unsure.
Features
- Watchman can recursively watch one or more directory trees
- Watchman does not follow symlinks
- It waits for a root to settle down before it starts to trigger notifications or command execution
- You can query a root for file changes since you last checked
- You can subscribe to file changes that occur in a root
- Watchman includes a C++ client library to facilitate easy access to Watchman data
Project Samples
