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PROGRAM:
NAME
DrIFT - a type sensitive preprocessor for Haskell
SYNOPSIS
DrIFT [ options ... ] file ...
DESCRIPTION
It extracts type declarations and directives from modules. The directives cause rules to
be fired on the parsed type declarations, generating new code which is then appended to
the bottom of the input file. The rules are expressed as Haskell code, and it is intended
that the user can add new rules as required.
DrIFT automates instance derivation for classes that aren't supported by the standard
compilers. In addition, instances can be produced in separate modules to that containing
the type declaration. This allows instances to be derived for a type after the original
module has been compiled. As a bonus, simple utility functions can also be produced from
a type.
-v, --verbose
chatty output on stderr
-V, --version
show version number
-l, --list
list available derivations
-L, --noline
omit line pragmas from output
-o FILE, --output=FILE
output FILE
-s name:value, --set=name:value
set argument to value
-r, --results-only
output only results, do not include source file
-g rule, --global=rule
addition rules to apply globally
-i, --ignore
ignore directives in file, which is useful with -g
ENVIRONMENT
The environment variable DERIVEPATH can be used to declare a list of directories which
contain the modules and/or interfaces that define the additional classes you wish to
derive from. DrIFT is quite fussy about the format of the DERIVEPATH variable. The
directory list should have the following format:
* each path should be separated by ‘:’
* no space inserted anywhere
* no final ‘/’ on the end of a path
Examples of DERIVEPATH settings:
good - /users/grad/nww/share/hugs/lib:/users/grad/nww/share/hugs/lib/hugs
bad - /users/grad/nww/share/hugs/lib/:/users/grad/nww/share/hugs/lib/hugs/
COPYRIGHT
© 2002 – 2004 DrIFT contributors
Permission is hereby granted, free of charge, to any person obtaining a copy of this
software and associated documentation files (the "Software"), to deal in the Software
without restriction, including without limitation the rights to use, copy, modify, merge,
publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or
substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
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