Add extra completion functionality to readline package

I propose adding a few functions having to do with readline word completion:

The rl_completion_word_break_hook variable lets us control what characters readline considers as word boundaries during completion. This function was added in readline version 5.0; we should not include this hook when compiling against earlier versions of the library.

Additionally, we should allow get/set of the rl_attempted_completion_over variable. If this variable is nonzero, readline won't use its default completer when our custom completer returns no results.

These will be used to fix ghc bug #998 (closed).

Trac metadata

Trac field	Value
Version	6.6
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	libraries (other)
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system	Unknown
Architecture	Unknown

mentioned in issue #998 (closed)

changed milestone to %Not GHC

changed weight to 5

added Tbug Trac import labels

Attached file readline.patch (download).

I think we should require readline 5.0 so that the readline Cabal package always presents the same interface. If someone is stuck with readline 4 then we can always make a readline4 package.

assigned to @simonmar

changed milestone to %6.8.1

assigned to @trac-igloo and unassigned @simonmar

Patch pushed; thanks.

Trac metadata

Trac field	Value
Type	Bug → MergeReq

added backport label and removed Tbug label

closed

Merged

Trac metadata

Trac field	Value
Resolution	Unresolved → ResolvedFixed

Trac metadata

Trac field	Value
Architecture	Unknown → Unknown/Multiple

Trac metadata

Trac field	Value
Operating system	Unknown → Unknown/Multiple

added Pnormal label