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This plugin defines a command |:TAssert| that takes an expression as argument and throws an exception if this expression evaluates to |empty()|. You can insert these comments throughout your code whenever something could potentially go wrong. The exception is then thrown right where the problem occurs. You could think of it as a poor man's design-by-contract substitute. One goal of this plugin is to allow users to quickly switch on or off assertions depending on the context. This can be done either by: 1. Turning assertions off so that they are not evaluated. This can be achieved by setting g:TASSERT to 0 or by calling the command |:TAssertOff|. 2. Commenting out assertions in the current buffer by calling the commmand |:TAssertComment|. Example: > fun! Test(a, b) TAssertType a:a, 'string' TAssertType a:b, 'number' TAssert !empty(a:a) return repeat(a:a, a:b) endf NOTE: The |:TAssertType| command requires the spec.vim plugin. *tAssert-logging* Logging:~ TAssert also includes a few convenience commands for logging -- see |:TLog|. *g:TLOG* The variable g:TLOG controls where messages are written to: echom ... Print messages in the echo area. file ... Print messages to a file; syntax "file:FILENAME" Decho ... Print messages via Decho (vimscript#642) *tAssert-install* Install:~ Edit the vba file and type: > :so % See :help vimball for details. If you have difficulties or use vim 7.0, please make sure, you have the current version of vimball (vimscript #1502) installed. See also |tassert-macros|. *tAssert-redistribute* Compatibility:~ If you want to redistribute files containing assertions but don't want to have people install this plugin, insert this close to the top of your file: > if !exists(':TAssert') command! -nargs=* -bar -bang TAssert : command! -nargs=* -bar -bang TAssertType : endif Alternatively, use the |:TAssertComment| command. %s Status: Works for me (there may be some minor quirks) Install: See http://github.com/tomtom/vimtlib/blob/master/INSTALL.TXT See http://github.com/tomtom for related plugins.