cmdline.md

Harbour switch handling spec

This spec goes for CLIPPERCMD, HARBOURCMD, Harbour compiler and #pragma directives in the source code.

The command-line always overrides the envvar.

Note that some switches are not accepted in envvar, some others in #pragmas.

First the parser should start to step through all the tokens in the string separated by whitespace. (or just walk through all argv[])

1. If the token begins with -, it should be treated as a new style switch.

   One or more switch characters can follow this. The - sign inside the token will turn off the switch.

   If the switch has an argument all the following characters are treated as part of the argument.

   The / sign has no special meaning here.

   Switch                Resulting options
   
   -wn                   ( W N )
   -w-n                  ( !W N )
   -wi/harbour/include/  ( W I=/harbour/include/ )
   -wi/harbour/include/n ( W I=/harbour/include/n )
   -wes0n                ( W ES=0 N )
   -wen                  ( W [invalid switch: e] N )
   -wesn                 ( W ES=Default(0) N )
   -wses                 ( W S ES=Default(0) )
   -wess                 ( W ES=Default(0) S )
   -                     ( [invalid switch] )
   -w-n-p                ( !W !N P )
   -w-n-p-               ( !W !N !P )
   
   -w- -w -w-            ( finally: !W )
   

2. If the token begins with /, it should be treated as a compatibility style switch.

   The parser scans the token for the next / sign or EOS and treats the resulting string as one switch.

   This means that a switch with an argument containing / sign has some limitations. This may be solved by allowing the usage of quote characters. This is mostly a problem on systems which use / as path separator.

   The - sign has no special meaning here, it cannot be used to disable a switch.

   Switch               Resulting options
   
   /w/n                 ( W N )
   /wo/n                ( [invalid switch: wo] N )
   /ihello/world/       ( I=hello [invalid switch: world] [invalid switch: /] )
   /i"hello/world/"/w   ( I=hello/world/ W )
   /ihello\world\       ( I=hello\world\ )
   

3. If the token begins with anything else it should be skipped.

   The Harbour switches are always case insensitive.

   In the Harbour command-line the two style can be used together:

   harbour -wnes2 /gc0/q0 -iC:\hb\include
   

   Exceptions:

   • Handling of the /CREDIT undocumented switch on Harbour command-line is unusual, check the current code for this.

   • CLIPPER, HARBOUR envvars and Harbour application command-line parsing is a different beast, see src/vm/cmdarg.c for a NOTE.

     Just some examples for the various accepted forms:

     //F20 == /F20 == F20 == F:20 == F20X
     F20//F:30000000 NOIDLE
     F0NOIDLEX10
     SQUAWKNOIDLE
     

     // should always be used on the command-line.

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Copyright © 1999–2009 Viktor Szakats