docstrip_util(n)					     Literate programming tool						  docstrip_util(n)

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NAME

       docstrip_util - Docstrip-related utilities

SYNOPSIS

       package require Tcl  8.4

       package require docstrip::util  ?1.2?

       docstrip::util::ddt2man text

       docstrip::util::guards subcmd text

       docstrip::util::thefile filename ?option value ...?

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DESCRIPTION

       The  docstrip::util  package  is meant for collecting various utility procedures that may be useful for developers who make use of the doc-
       strip package in some projects. It is separate from the main package to avoid overhead for end-users.

COMMANDS

       docstrip::util::ddt2man text
	      The ddt2man command reformats text from the general docstrip format to doctools ".man" format (Tcl Markup  Language  for	Manpages).
	      The different line types are treated as follows:

	      comment and metacomment lines
		     The '%' and '%%' prefixes are removed, the rest of the text is kept as it is.

	      empty lines
		     These  are  kept  as they are. (Effectively this means that they will count as comment lines after a comment line and as code
		     lines after a code line.)

	      code lines
		     example_begin and example_end commands are placed at the beginning and end of every block of consecutive code lines. Brackets
		     in a code line are converted to lb and rb commands.

	      verbatim guards
		     These  are  processed  as usual, so they do not show up in the result but every line in a verbatim block is treated as a code
		     line.

	      other guards
		     These are treated as code lines, except that the actual guard is emphasised.
       At the time of writing, no project has employed doctools markup in master source files, so experience of what works well is not	available.
       A source file could however look as follows

	  % [manpage_begin gcd n 1.0]
	  % [moddesc {Greatest Common Divisor}]
	  % [require gcd [opt 1.0]]
	  % [description]
	  %
	  % [list_begin definitions]
	  % [call [cmd gcd] [arg a] [arg b]]
	  %   The [cmd gcd] procedure takes two arguments [arg a] and [arg b] which
	  %   must be integers and returns their greatest common divisor.
	  proc gcd {a b} {
	  %   The first step is to take the absolute values of the arguments.
	  %   This relieves us of having to worry about how signs will be treated
	  %   by the remainder operation.
	     set a [expr {abs($a)}]
	     set b [expr {abs($b)}]
	  %   The next line does all of Euclid's algorithm! We can make do
	  %   without a temporary variable, since $a is substituted before the
	  %   [lb]set a $b[rb] and thus continues to hold a reference to the
	  %   "old" value of [var a].
	     while {$b>0} { set b [expr { $a % [set a $b] }] }
	  %   In Tcl 8.3 we might want to use [cmd set] instead of [cmd return]
	  %   to get the slight advantage of byte-compilation.
	  %<tcl83>  set a
	  %<!tcl83>   return $a
	  }
	  % [list_end]
	  %
	  % [manpage_end]

       If the above text is (suitably unindented and) fed through docstrip::util::ddt2man then the result will be a syntactically correct doctools
       manpage, even though its purpose is a bit different.

       It is suggested that master source code files with doctools markup are given the suffix ".ddt", hence the "ddt" in ddt2man.

       docstrip::util::guards subcmd text
	      The guards command returns information (mostly of a statistical nature) about the ordinary docstrip guards that occur in	the  text.
	      The subcmd selects what is returned.

	      counts List  the guard expression terminals with counts. The format of the return value is a dictionary which maps the terminal name
		     to the number of occurencies of it in the file.

	      exprcount
		     List the guard expressions with counts. The format of the return value is a dictionary which maps the expression to the  num-
		     ber of occurencies of it in the file.

	      exprerr
		     List  the	syntactically  incorrect  guard expressions (e.g.  parentheses do not match, or a terminal is missing). The return
		     value is a list, with the elements in no particular order.

	      expressions
		     List the guard expressions. The return value is a list, with the elements in no particular order.

	      exprmods
		     List the guard expressions with modifiers. The format of the return value is a dictionary where each index is a guard expres-
		     sion and each entry is a string with one character for every guard line that has this expression. The characters in the entry
		     specify what modifier was used in that line: +, -, *, /, or (for guard without modifier:) space. This is the  most  primitive
		     form of the information gathered by guards.

	      names  List the guard expression terminals. The return value is a list, with the elements in no particular order.

	      rotten List  the	malformed  guard lines (this does not include lines where only the expression is malformed, though). The format of
		     the return value is a dictionary which maps line numbers to their contents.

       docstrip::util::thefile filename ?option value ...?
	      The thefile command opens the file filename, reads it to end, closes it, and returns the contents. The option-value pairs are passed
	      on to fconfigure to configure the open file channel before anything is read from it.

SEE ALSO

       docstrip, doctools, doctools_fmt

KEYWORDS

COPYRIGHT

       Copyright (c) 2003-2005 Lars Hellstrom <Lars dot Hellstrom at residenset dot net>

docstrip								1.2							  docstrip_util(n)