Manages file scan contexts.

Synopsis

scancontext ?option?

Description

This command manages file scan contexts. A scan context is a collection of regular expressions and commands to execute when that regular expression matches a line of the file. A context may also have a single default match, to be applied against lines that do not match any of the regular expres- sions. Multiple scan contexts may be defined and they may be reused on multiple files. A scan con- text is identified by a context handle. The scan- context command takes the following forms:

scancontext create Create a new scan context. The scanmatch command is used to define patterns in the context. A con- texthandle is returned, which the Tcl programmer uses to refer to the newly created scan context in calls to the Tcl file scanning commands.

scancontext delete contexthandle Delete the scan context identified by contex- thandle, and free all of the match statements and compiled regular expressions associated with the specified context.

scancontext copyfile contexthandle ?filehandle? Set or return the file handle that unmatched lines are copied to. (See scanfile). If filehandle is omitted, the copy file handle is returned. If no copy file is associated with the context, {} is returned. If a file handle is specified, it becomes the copy file for this context. If file- handle is {}, then it removes any copy file speci- fication for the context.