Writing Macros ============== A "macro" is a collection of text and embedded commands which can be invoked multiple times. Use macros to define common operations. - Request: .de name [end] Define a new macro named NAME. `gtroff' copies subsequent lines (starting with the next one) into an internal buffer until it encounters the line `..' (two dots). The optional second argument to `de' changes this to a macro to `.END'. Note that no leading whitespace is allowed in the line containing the ending token (either `..' or the macro `.END'). Here a small example macro called `P' which causes a break and inserts some vertical space. It could be used to separate paragraphs. .de P . br . sp .8v .. - Request: .am xx Works similarly to `de' except it appends onto the macro named XX. So, to make the previously defined `P' macro actually do indented instead of block paragraphs, add the necessary code to the existing macro like this: .am P .ti +5n .. - Request: .als new old Create an alias named NEW for the request, string, macro, or diversion object named OLD. The new name and the old name are exactly equivalent (it is similar to a hard rather than a soft link). If OLD is undefined, `gtroff' generates a warning of type `mac' and ignores the request. The `de', `am', `di', `da', `ds', and `as' requests only create a new object if the name of the macro, diversion or string diversion is currently undefined or if it is defined to be a request; normally they modify the value of an existing object.
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