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m
#define m4: \
I-------------------------------\
I-------------------------------\
I     /$$      /$$ /$$   /$$    \
I    | $$$    /$$$| $$  | $$    \
I    | $$$$  /$$$$| $$  | $$    \
I    | $$ $$/$$ $$| $$$$$$$$    \
I    | $$  $$$| $$|_____  $$    \
I    | $$\  $ | $$      | $$    \
I    | $$ \/  | $$      | $$    \
I    |__/     |__/      |__/    \
I-------------------------------\
I-------------------------------I

    • macro based text generation language
    • part of standard *nix distributions

    
        info m4

    Macro:
        <name>          : simple macro
        <name>(<arg>+)  : function like macro, can arbitrary use all arguments passed in
        { // Example
            define(macro, my_text)dnl
            define(macro2, `my_text is $1')dnl
            macro
            macro2(lovely)
          // Result
            $ m4 example.m4
            my_text
            my_text is lovely
        }
    Expansion:
        • text is subject to macro expansion given its recognized as a macro
        Quoting:
            ``<literal>''
            • quoted text expand to itself without quotes
            •  literals start with a back tick ('`') and end with a apostrophe ('\'')
    Variables:
        $1 $2 $3 $4 $5 $6 $7 $8 $9
        • recognized inside the deplaration of function like macros
        • expand to arguments
    Builtin_Macros:
        dnl<comment>            : "Delete New Line"; deletes everything to the right of the macro on the same line, including the '\n';
                                    used for truncating whitespace in the output and or for commenting
        include(<file>)         : expands to the contents of <file>
        define(<name>, <value>) : creates a new macro named <name> expanding to <value>