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1.1 Starting Flymake

To use Flymake, activate the minor-mode flymake-mode. Use the command flymake-mode to toggle it on and off. The mode line should indicate its presence via an indicator (see Mode line status).

Syntax checks happen “on-the-fly”. Each check is started whenever:

• flymake-mode is started, unless flymake-start-on-flymake-mode is nil;
• the buffer is saved, unless flymake-start-on-save-buffer is nil;
• some changes were made to the buffer more than 0.5 seconds ago (the delay is configurable in flymake-no-changes-timeout).
• When the user invokes the command flymake-start.

If the check detected errors or warnings, the respective buffer regions are highlighted. See Finding diagnostics, for how to learn what the problems are.