This used to happen in Dh_Haskell.sh before the Perl port.  This should fix
a large number of packages being reported as FTBFS on the reproducible
status.

Previously run() was capturing the output until the command completed.  For
very long builds, this could make it appear to the buildd that the build was
hung.

This caused tests to not being run.

This should fix #1011762, bug#1011767, #1011764, #1011834, #1011873,

The CABAL_PACKAGE environment variable holds the Debianized name of the
Haskell package (e.g., for the X11-xft Haskell package, CABAL_PACKAGE
will be 'x11-xft').

This means that ${CABAL_PACKAGE}.cabal may not exist. Try
glob("*.cabal") instead.

Fix a bug in the code that modifies the timestamps for files with
incorrect ones.

The grep/sed method didn't work for some .cabal files, so just use
Haskell which will necessarily know how to parse it's own files.  This
will be a bit slower, but probably not enough to care too much.

This reverts commit 3061a1b8.  It broke haddock installation.

bug#1011767, #1011764, #1011834, #1011873, #1011877, #1011915, #1011860,
bug#1011855, #1011910, #1011896)

Evidently, haddock wipes out some of the files created by the build
recipe (specifically at least the in-place registration files in
dist-ghc/package.conf.inplace), so move it before build.

Replace the broken shell expansion with calls to
Text::ParseWords::shellwords() which seems to be the Perl way of parsing
command line arguments into an array.

When a GHC package uses internal or convenience libraries, package
registration will generate a directory (containing multiple files)
instead of a single file.  In this case, only install/parse the *first*
file in the directory as this should contain the public library and we
don't install/parse the internal library files.

Other commands have been envisioned, but so far the sole dot is the only one.

This bug was introduced in commit 9389c725 when the author overlooked the
second 'sed' expression on this line:

  https://salsa.debian.org/haskell-team/haskell-devscripts/-/blob/f1728c583936c8dd77059fdf74e7276ca8d2a178/dh_haskell_blurbs#L97

The fix was verified with the haskell-exceptions sources mentioned in the bug
report.

Thanks to Scott Talbert for bringing the matter to our attention!

Thanks to David Fox for bringing the matter to our attention, and for the fix
as well!

Fix tested with haskell-yaml_0.11.4.0-1.

Thanks to Scott Talbert for bringing this matter to our attention!

Fix tested with haskell-attoparsec_0.13.2.4-2.

Thanks to Scott Talbert for bringing this matter to our attention!

Hopefully we got all of them.

Thanks to Scott Talbert for bringing the matter to our attention!