hat-trans - transform a Haskell module for tracing with the Hat system

hat-trans [-cpp [cppopts]] [-Idir]* [-package p]* [transopts] Mod.[l]hs ...

hat-trans is a batch tool for transforming a Haskell program into one which calculates its own trace. It transforms each source module Mod supplied as arguments. The modules may be ordinary source (.hs) or literate source (.lhs). The output is a transformed module, whose name is the original module name prefixed with "Hat.", and it is written to a file of similar name in the local subdirectory Hat/ (except that .lhs becomes .hs, because the literate part is stripped). If the subdirectory does not exist, it is created. The original source filename may include a directory path, in which case the transformed module is placed in an identical directory tree underneath the directory Hat/. This facilitates the easy transformation of modules within the hierarchical module namespace.

The resulting transformed modules can be compiled and linked in the normal way with your favorite Haskell compiler, with the addition of the option -package hat to its command-line.

Alternatively, rather than invoking hat-trans and a compiler by hand on your source files, but it is often more convenient to allow hmake(1) to invoke the tools automatically, especially because it also determines dependencies between modules and attempts to perform the minimum re-compilation necessary. Simple give the extra option "-hat" to hmake.

-Idir

Use the directory dir as an additional root when searching for imported modules.

-package p

The given source module(s) use standard modules from within the package p (this automatically adds the installed package root directory to the import search path).

-cpp

Invoke the C preprocessor on the source code before it is transformed. This is useful for conditional transformation. One cpp symbol is predefined, __HAT__, whose value is the version number of the Hat toolset, expressed as a three digit integer, e.g. version 2.02 gives __HAT__=202. If the -cpp option is given, the preprocessor is invoked on all the files given as arguments. An alternative which only invokes cpp on the files that really need it, is to place a Haskell comment containing the string "-cpp" as the first line of a source file.

-Dsym=val

Define the cpp symbol sym to have the value val

-Dsym

Define the cpp symbol sym

-Usym

Undefine the cpp symbol sym

The following options are available to change the usual transformation behaviour.

-unlit

Unliterate the source code. (Automatic if the file is .lhs)

-nounlit

Do not unliterate the source code. (Automatic if the file is .hs)

-underscore

Treat underscores strictly as lowercase (default).

-nounderscore

Treat underscores as invisible, e.g. _f is varid, _F is conid.

-prelude

Treat prelude definitions specially.

-noprelude

Do not treat definitions specially (default).

-trusted

Make this a "trusted" module.

-notrusted

Make this an "untrusted" module (default).

-showwidth=w

Set output width (in characters) to w (default=80).

-showindent=i

Set layout nesting indentation (in characters) to i (default=2).

-showqualified

Use fully qualified names in the output. This is off by default, because the output may refer to modules which are not explicitly imported.

The following options are available to examine the internal progress of the transformation.

-lex

Show input after lexical analysis.

-parse

Show syntax tree after parsing.

-tracefns

Show syntax tree after tracing translation.

/usr/bin/hat-trans

hmake(1), hat-detect(1), hat-observe(1), hat-trail(1), hat-stack(1)