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Cabal-install is broken
by Permjacov Evgeniy 23 Nov '10

23 Nov '10

current cabal-install (0.8.2) cannot be compiled with ghc-7.0.1 set of boot libraries. It requires cabal 1.8.* wich fails to compile. Does anyone worked this out ?

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Why does cabal unnecessarily reinstall dependencies?
by Martijn van Steenbergen 23 Nov '10

23 Nov '10

Hello cafe, When I want to locally install my own package through "cabal install" it tries to reinstall dependencies convertible-1.0.9.1, HDBC-2.2.6.1 and HDBC-mysql-0.6.3 even though they are already installed (and work fine). Why does it do this? cabal-install version 0.8.2 using version 1.8.0.2 of the Cabal library Mac OS Leopard Thanks, Martijn.

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VNC server in Haskell
by C K Kashyap 23 Nov '10

23 Nov '10

Hi, I've implemented a VNC server (very incomplete) - What it can do currently is display a blue screen (100x100 screen). It's very trivial to try out - https://github.com/ckkashyap/Chitra I look forward to some feedback/comments on this. -- Regards, Kashyap

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Wrong Package-URL in regex-tdfa.cabal
by José Romildo Malaquias 23 Nov '10

23 Nov '10

Hello. The cabal file for the regex-tddfa-1.1.6 package seems to have an invalid URL for the Package-URL field: Package-URL: http://darcs.haskell.org/packages/regex-unstable/regex-tdfa/ It should be fixed. Regards. Romildo

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Build problems with HDBC-mysql on the Mac
by Martijn van Steenbergen 22 Nov '10

22 Nov '10

Dear cafe, Following the instructions at http://matt.freels.name/2010/hdbc-mysql-os-x.html I successfully installed HDBC-mysql on my Mac! However when doing a "cabal install" in a local package which depends on HDBC-mysql, cabal proceeds to reinstall HDBC-mysql (is this a bug? see my other email from a few moments ago), this time unsuccessfully because it is using the unpatched cached version downloaded from hackage. This breaks my installation: ghc-pkg list colors the package red. Now comes the weird part. :-) I try to reinstall HDBC-mysql with my unpacked, patched version. It fixes my installation of HDBC-again, even though it exits prematurely with some errors! I've included the output at the end of this email. I wonder: Where do these errors suddenly come from? The first time the installation went without trouble. How come it fixes my installation even though it reports errors? Thank you in advance, Martijn. Output of "cabal install --extra-lib-dirs=/usr/local/lib:" in a local version of HDBC-mysql, patched according to http://matt.freels.name/2010/hdbc-mysql-os-x.html: Resolving dependencies... [1 of 1] Compiling Main ( Setup.lhs, dist/setup/Main.o ) Setup.lhs:8:0: Warning: In the use of `findProgramOnPath' (imported from Distribution.Simple.Program): Deprecated: "use findProgramLocation instead" Linking ./dist/setup/setup ... Configuring HDBC-mysql-0.6.3... Preprocessing library HDBC-mysql-0.6.3... Connection.hsc:23:19: error: mysql.h: No such file or directory Connection.hsc: In function ‘main’: Connection.hsc:166: error: ‘MYSQL_FIELD’ undeclared (first use in this function) Connection.hsc:166: error: (Each undeclared identifier is reported only once Connection.hsc:166: error: for each function it appears in.) Connection.hsc:170: error: expected specifier-qualifier-list before ‘MYSQL_FIELD’ Connection.hsc:170: error: expected ‘;’ before ‘)’ token Connection.hsc:170: error: expected statement before ‘)’ token Connection.hsc:171: error: expected specifier-qualifier-list before ‘MYSQL_FIELD’ Connection.hsc:171: error: expected ‘;’ before ‘)’ token Connection.hsc:171: error: expected statement before ‘)’ token Connection.hsc:172: error: expected specifier-qualifier-list before ‘MYSQL_FIELD’ Connection.hsc:172: error: expected ‘;’ before ‘)’ token Connection.hsc:172: error: expected statement before ‘)’ token Connection.hsc:173: error: expected specifier-qualifier-list before ‘MYSQL_FIELD’ Connection.hsc:173: error: expected ‘;’ before ‘)’ token Connection.hsc:173: error: expected statement before ‘)’ token Connection.hsc:174: error: expected specifier-qualifier-list before ‘MYSQL_FIELD’ Connection.hsc:174: error: expected ‘;’ before ‘)’ token Connection.hsc:174: error: expected statement before ‘)’ token Connection.hsc:175: error: expected specifier-qualifier-list before ‘MYSQL_FIELD’ Connection.hsc:175: error: expected ‘;’ before ‘)’ token Connection.hsc:175: error: expected statement before ‘)’ token Connection.hsc:203: error: ‘MYSQL_BIND’ undeclared (first use in this function) Connection.hsc:210: error: expected specifier-qualifier-list before ‘MYSQL_BIND’ Connection.hsc:210: error: expected ‘;’ before ‘)’ token Connection.hsc:210: error: expected statement before ‘)’ token Connection.hsc:211: error: expected specifier-qualifier-list before ‘MYSQL_BIND’ Connection.hsc:211: error: expected ‘;’ before ‘)’ token Connection.hsc:211: error: expected statement before ‘)’ token Connection.hsc:212: error: expected specifier-qualifier-list before ‘MYSQL_BIND’ Connection.hsc:212: error: expected ‘;’ before ‘)’ token Connection.hsc:212: error: expected statement before ‘)’ token Connection.hsc:213: error: expected specifier-qualifier-list before ‘MYSQL_BIND’ Connection.hsc:213: error: expected ‘;’ before ‘)’ token Connection.hsc:213: error: expected statement before ‘)’ token Connection.hsc:214: error: expected specifier-qualifier-list before ‘MYSQL_BIND’ Connection.hsc:214: error: expected ‘;’ before ‘)’ token Connection.hsc:214: error: expected statement before ‘)’ token Connection.hsc:215: error: expected specifier-qualifier-list before ‘MYSQL_BIND’ Connection.hsc:215: error: expected ‘;’ before ‘)’ token Connection.hsc:215: error: expected statement before ‘)’ token Connection.hsc:216: error: expected specifier-qualifier-list before ‘MYSQL_BIND’ Connection.hsc:216: error: expected ‘;’ before ‘)’ token Connection.hsc:216: error: expected statement before ‘)’ token Connection.hsc:228: error: ‘MYSQL_TIME’ undeclared (first use in this function) Connection.hsc:232: error: expected specifier-qualifier-list before ‘MYSQL_TIME’ Connection.hsc:232: error: expected ‘;’ before ‘)’ token Connection.hsc:232: error: expected statement before ‘)’ token Connection.hsc:233: error: expected specifier-qualifier-list before ‘MYSQL_TIME’ Connection.hsc:233: error: expected ‘;’ before ‘)’ token Connection.hsc:233: error: expected statement before ‘)’ token Connection.hsc:234: error: expected specifier-qualifier-list before ‘MYSQL_TIME’ Connection.hsc:234: error: expected ‘;’ before ‘)’ token Connection.hsc:234: error: expected statement before ‘)’ token Connection.hsc:235: error: expected specifier-qualifier-list before ‘MYSQL_TIME’ Connection.hsc:235: error: expected ‘;’ before ‘)’ token Connection.hsc:235: error: expected statement before ‘)’ token Connection.hsc:236: error: expected specifier-qualifier-list before ‘MYSQL_TIME’ Connection.hsc:236: error: expected ‘;’ before ‘)’ token Connection.hsc:236: error: expected statement before ‘)’ token Connection.hsc:237: error: expected specifier-qualifier-list before ‘MYSQL_TIME’ Connection.hsc:237: error: expected ‘;’ before ‘)’ token Connection.hsc:237: error: expected statement before ‘)’ token Connection.hsc:242: error: expected specifier-qualifier-list before ‘MYSQL_TIME’ Connection.hsc:242: error: expected ‘;’ before ‘)’ token Connection.hsc:242: error: expected statement before ‘)’ token Connection.hsc:243: error: expected specifier-qualifier-list before ‘MYSQL_TIME’ Connection.hsc:243: error: expected ‘;’ before ‘)’ token Connection.hsc:243: error: expected statement before ‘)’ token Connection.hsc:244: error: expected specifier-qualifier-list before ‘MYSQL_TIME’ Connection.hsc:244: error: expected ‘;’ before ‘)’ token Connection.hsc:244: error: expected statement before ‘)’ token Connection.hsc:245: error: expected specifier-qualifier-list before ‘MYSQL_TIME’ Connection.hsc:245: error: expected ‘;’ before ‘)’ token Connection.hsc:245: error: expected statement before ‘)’ token Connection.hsc:246: error: expected specifier-qualifier-list before ‘MYSQL_TIME’ Connection.hsc:246: error: expected ‘;’ before ‘)’ token Connection.hsc:246: error: expected statement before ‘)’ token Connection.hsc:247: error: expected specifier-qualifier-list before ‘MYSQL_TIME’ Connection.hsc:247: error: expected ‘;’ before ‘)’ token Connection.hsc:247: error: expected statement before ‘)’ token Connection.hsc:368: error: ‘MYSQL_TYPE_NULL’ undeclared (first use in this function) Connection.hsc:381: error: ‘MYSQL_TYPE_VAR_STRING’ undeclared (first use in this function) Connection.hsc:385: error: ‘MYSQL_TYPE_LONGLONG’ undeclared (first use in this function) Connection.hsc:389: error: ‘MYSQL_TYPE_TINY’ undeclared (first use in this function) Connection.hsc:397: error: ‘MYSQL_TYPE_DOUBLE’ undeclared (first use in this function) Connection.hsc:401: error: ‘MYSQL_TYPE_LONG’ undeclared (first use in this function) Connection.hsc:422: error: ‘MYSQL_TYPE_DATETIME’ undeclared (first use in this function) Connection.hsc:438: error: ‘MYSQL_TYPE_TIME’ undeclared (first use in this function) Connection.hsc:492: error: ‘UNSIGNED_FLAG’ undeclared (first use in this function) Connection.hsc:510: error: ‘MYSQL_TYPE_STRING’ undeclared (first use in this function) Connection.hsc:512: error: ‘MYSQL_TYPE_SHORT’ undeclared (first use in this function) Connection.hsc:513: error: ‘MYSQL_TYPE_INT24’ undeclared (first use in this function) Connection.hsc:514: error: ‘MYSQL_TYPE_YEAR’ undeclared (first use in this function) Connection.hsc:515: error: ‘MYSQL_TYPE_ENUM’ undeclared (first use in this function) Connection.hsc:516: error: ‘MYSQL_TYPE_DECIMAL’ undeclared (first use in this function) Connection.hsc:518: error: ‘MYSQL_TYPE_NEWDECIMAL’ undeclared (first use in this function) Connection.hsc:520: error: ‘MYSQL_TYPE_FLOAT’ undeclared (first use in this function) Connection.hsc:521: error: ‘MYSQL_TYPE_DATE’ undeclared (first use in this function) Connection.hsc:522: error: ‘MYSQL_TYPE_TIMESTAMP’ undeclared (first use in this function) Connection.hsc:523: error: ‘MYSQL_TYPE_NEWDATE’ undeclared (first use in this function) Connection.hsc:524: error: ‘MYSQL_TYPE_BLOB’ undeclared (first use in this function) Connection.hsc:544: error: ‘MYSQL_DATA_TRUNCATED’ undeclared (first use in this function) Connection.hsc:545: error: ‘MYSQL_NO_DATA’ undeclared (first use in this function) Connection.hsc:607: error: ‘NOT_NULL_FLAG’ undeclared (first use in this function) Connection.hsc:629: error: ‘MYSQL_TYPE_VARCHAR’ undeclared (first use in this function) Connection.hsc:630: error: ‘MYSQL_TYPE_BIT’ undeclared (first use in this function) Connection.hsc:633: error: ‘MYSQL_TYPE_SET’ undeclared (first use in this function) Connection.hsc:634: error: ‘MYSQL_TYPE_TINY_BLOB’ undeclared (first use in this function) Connection.hsc:635: error: ‘MYSQL_TYPE_MEDIUM_BLOB’ undeclared (first use in this function) Connection.hsc:636: error: ‘MYSQL_TYPE_LONG_BLOB’ undeclared (first use in this function) Connection.hsc:640: error: ‘MYSQL_TYPE_GEOMETRY’ undeclared (first use in this function) compiling dist/build/Database/HDBC/MySQL/Connection_hsc_make.c failed command was: /usr/bin/gcc -c -m32 -D__GLASGOW_HASKELL__=612 -I-L/usr/local/Cellar/readline/6.1/lib -I-arch -Ii386 -I-L/usr/local/Cellar/mysql/5.1.51/lib/mysql -I-lmysqlclient -I-lz -I-lm -I/Library/Frameworks/GHC.framework/Versions/612/usr/lib/ghc-6.12.3/time-1.1.4/include -I/Library/Frameworks/GHC.framework/Versions/612/usr/lib/ghc-6.12.3/old-time-1.0.0.5/include -I/Library/Frameworks/GHC.framework/Versions/612/usr/lib/ghc-6.12.3/bytestring-0.9.1.7/include -I/Library/Frameworks/GHC.framework/Versions/612/usr/lib/ghc-6.12.3/base-4.2.0.2/include -I/Library/Frameworks/GHC.framework/Versions/612/usr/lib/ghc-6.12.3/include -I/Library/Frameworks/GHC.framework/Versions/612/usr/lib/ghc-6.12.3/include -I/Library/Frameworks/GHC.framework/Versions/612/usr/lib/ghc-6.12.3/include/ dist/build/Database/HDBC/MySQL/Connection_hsc_make.c -o dist/build/Database/HDBC/MySQL/Connection_hsc_make.o cabal: Error: some packages failed to install: HDBC-mysql-0.6.3 failed during the building phase. The exception was: ExitFailure 1

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Derived type definition
by kg 22 Nov '10

22 Nov '10

Hi, I've tried to simplify as much as possible my problem. Finally, I think I can resume it like that: Suppose these following data types : data Rec a r = Rec a r data RecNil = RecNil data Wrapper a = Wrapper a Then, we can build the following type: type TTest = Rec Int (Rec String RecNil) or this type: type TTestWrapped = Rec (Wrapper Int) (Rec (Wrapper String) RecNil) Is it possible to build TTestWrapped from TTest ? Thx in advance, Antoine.

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looking for tagsoup-parsec examples
by José Romildo Malaquias 22 Nov '10

22 Nov '10

Hello. I am looking for some examples of code using Text.HTML.TagSoup.Parsec, from the tagsoup-parsec package. Romildo

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GUI Designer
by c8h10n4o2 22 Nov '10

22 Nov '10

There's a tutorial on how to use qtDesigner with qtHaskell ? Or how to use XRC files with wxHaskell? -- View this message in context: http://haskell.1045720.n5.nabble.com/GUI-Designer-tp3271441p3271441.html Sent from the Haskell - Haskell-Cafe mailing list archive at Nabble.com.

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Berlin Haskell Meeting
by Sönke Hahn 22 Nov '10

22 Nov '10

The next haskell meeting in Berlin will be this wednesday: Date: Wednesday, November 24th Time: from 20:00 Location: c-base, Rungestrasse 20, 10179 Berlin Hope to see you there, Sönke

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Yesod.Form: Password fields?
by Ertugrul Soeylemez 22 Nov '10

22 Nov '10

Hello everybody, how can I create a password field using Yesod.Form? It doesn't seem to support them. Greets, Ertugrul -- nightmare = unsafePerformIO (getWrongWife >>= sex) http://ertes.de/

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