v/cmd/v/help/watch.txt

v watch [--clear] [--ignore .db] [--add /path/to/a/file.v] [other V options] [run] program.v

Description:
`v watch` collects all .v files needed for a compilation, then when
any of the .v source files changes, it re-runs the compilation.

Options:
  -s, --silent              Be more silent; do not print the watch timestamp before each re-run.

  -c, --clear               Clears the terminal before each re-run.

  -a, --add <string>        Add more files to be watched.
                            Useful with `v watch -add=feature.v run cmd/v feature.v`,
                            when you want to change *both* the V compiler,
                            and the `feature.v` file.

  -i, --ignore <string>     Ignore files having these extensions.
                            Useful with `v watch -ignore=.db run vwebserver.v`,
                            if your `vwebserver` writes to an sqlite.db file in the
                            same folder.

  --before <string>         A command to execute *before* each re-run. Example: --before 'v wipe-cache'
  
  --after <string>          A command to execute *after* each re-run. Example: --after 'rm -rf /tmp/v/'
	
You can also customise the timeout, after `v watch` will re-start a monitored
program automatically, even if it was not changed by setting the enviroment 
variable VWATCH_TIMEOUT (in seconds). By default, it is 5 min. (300 seconds).