#4836: literate markdown not handled correctly by unlit
---------------------------------+------------------------------------------
Reporter: guest | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.0.1 | Keywords:
Testcase: | Blockedby:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: GHC rejects valid program
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This simple program in literate haskell, using markdown in the comments
gives unlit problems:
{{{
### Ok so lets try this again.
### A page that loads and compiles:
> myfact 0 = 1
> myfact n = n * n-1
Lets see if it works!
}}}
If I run unlit and collect the output I can see where it went wrong:
{{{
$ ~/lib/ghc-7.0.1/unlit Main.lhs Main.lpp
$ cat Main.lpp
### Ok so lets try this again.
### A page that loads and compiles:
myfact 0 = 1
myfact n = n * n-1
}}}
When I look through the source code of unlit.c I think the place to check
for this would be here:
{{{
if ( c == '#' ) {
if ( ignore_shebang ) {
c1 = egetc(istream);
if ( c1 == '!' ) {
while (c=egetc(istream), !isLineTerm(c)) ;
return SHEBANG;
}
myputc(c, ostream);
c=c1;
}
if ( leavecpp ) {
myputc(c, ostream);
while (c=egetc(istream), !isLineTerm(c))
myputc(c,ostream);
myputc('\n',ostream);
return HASH;
}
}
}}}
It seems that cabal has a similar unlit function:
http://www.haskell.org/ghc/docs/latest/html/libraries/Cabal-1.10.0.0/src
/Distribution-Simple-PreProcess-Unlit.html#unlit
I haven't tested it but, I think the cabal version would handle this case
correctly (or be easier to fix than a C program from 1990). Would it be
possible/wise/feasible to extract the cabal version and make it a
permanent replacement for the current unlit.c code?
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4836>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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