For example, in Dependency.hs there is a function called "resolveDependencies".
It now takes an optional parameter, which is a "Pointer QGoalReasonChain" (or QPointer) which tells it that it should only resolve whatever is left below that pointer, hence keeping the choices made there.
The Interactive Solver is now started in Install.hs' makeInstallPlan.
However, it checks so in a very pedantic way:
The Interactive Solver is now started in Install.hs' makeInstallPlan.
However, it checks so in a very pedantic way:
if fromFlag (installInteractive installFlags) && solver == Modular -- How could this be handled better?
then do
notice verbosity "Starting interactive dependency solver..."
mptr <- runInteractive platform (compilerId comp) solver resolverParams
case mptr of
Nothing -> return Nothing -- The user does not want to install anything.
x -> return $ Just (resolveUsing x)
The case-analysis could be replaced by something shorter,
return $ mptr >>= return . resolveUsing . return
but I have been told that this is not very readable. ;-)
(Possibly hinting at a bad design..)
I will have to look for a better integration..
Also, I have tried to improve the output of the solver, implemented some more commands, (install works now!) and the IDE knows about autocomplete-on-tab now.
Here is the example session:
(If you want to try this: the IDE assumes a terminal with 100 characters worth of width)
cabal install snap --interactive Starting interactive dependency solver... Welcome to cabali! This interface accepts simple commands separated by ';'. E.g. go 1 ; auto go n chooses n - alternatively "n" does the same. Just Enter, picks the first choice up goes up one step top goes all the way to the top auto starts the automatic solver goto aeson runs the parser until it sets aeson's version goto aeson:test runs the parser until it sets the flag test for aeson prefer aeson sorts the choices so that aeson comes first if it is available (Same arguments as goto) bset name sets a bookmark called name blist lists all bookmarks bjump name jumps to the bookmark name indicateAuto indicates the choices the solver would have made with a little (*) install Once the interface says 'Done', you can type 'install' to install the package showPlan shows what is going to be installed/used Missing dependencies (1) snap > 1 Version of snap (1) 0.12.0 (2) 0.11.3.1 (3) 0.11.3 (4) 0.11.2.2 (5) 0.11.2.1 (6) 0.11.2 (7) 0.11.1 (8) 0.11.0 (9) 0.10.0.1 (10) 0.10.0 (11) 0.9.2.2 (12) 0.9.2.1 (13) 0.9.2 (14) 0.9.1.1 (15) 0.9.1 (16) 0.9.0.1 (17) 0.9.0 (18) 0.8.1 (19) 0.8.0.2 (20) 0.8.0.1 (21) 0.8.0 (22) 0.7 (23) 0.6.0.2 (24) 0.6.0.1 (25) 0.6.0 (26) 0.5.5.1 (27) 0.5.5 (28) 0.5.4 (29) 0.5.3.1 (30) 0.5.3 (31) 0.5.2 (32) 0.5.1.3 (33) 0.5.1.2 (34) 0.5.1.1 (35) 0.5.1 (36) 0.5.0 (37) 0.4.3 (38) 0.4.2 (39) 0.4.1 (40) 0.4 (41) 0.3.1 (42) 0.3.0.1 (43) 0.3.0 > 1 Missing dependencies (1) base (2) snap-0.12.0:old-base (3) template-haskell (4) old-time (5) snap-0.12.0:old-base (6) xmlhtml (7) vector-algorithms (8) vector (9) unordered-containers (10) transformers (11) time (12) text (13) syb (14) stm (15) snap-server (16) snap-core (17) regex-posix (18) pwstore-fast (19) mwc-random (20) mtl (21) logict (22) heist (23) hashable (24) filepath (25) errors (26) dlist (27) directory-tree (28) directory (29) containers (30) configurator (31) comonad (32) clientsession (33) cereal (34) bytestring (35) attoparsec (36) aeson (37) MonadCatchIO-transformers > indicateAuto Missing dependencies (1) base (*) (2) snap-0.12.0:old-base (3) template-haskell (4) old-time (5) snap-0.12.0:old-base (6) xmlhtml (7) vector-algorithms (8) vector (9) unordered-containers (10) transformers (11) time (12) text (13) syb (14) stm (15) snap-server (16) snap-core (17) regex-posix (18) pwstore-fast (19) mwc-random (20) mtl (21) logict (22) heist (23) hashable (24) filepath (25) errors (26) dlist (27) directory-tree (28) directory (29) containers (30) configurator (31) comonad (32) clientsession (33) cereal (34) bytestring (35) attoparsec (36) aeson (37) MonadCatchIO-transformers > prefer stm Missing dependencies (1) stm (2) base (*) (3) snap-0.12.0:old-base (4) template-haskell (5) old-time (6) snap-0.12.0:old-base (7) xmlhtml (8) vector-algorithms (9) vector (10) unordered-containers (11) transformers (12) time (13) text (14) syb (15) snap-server (16) snap-core (17) regex-posix (18) pwstore-fast (19) mwc-random (20) mtl (21) logict (22) heist (23) hashable (24) filepath (25) errors (26) dlist (27) directory-tree (28) directory (29) containers (30) configurator (31) comonad (32) clientsession (33) cereal (34) bytestring (35) attoparsec (36) aeson (37) MonadCatchIO-transformers > indicateAuto Missing dependencies (1) stm (*) (2) base (3) snap-0.12.0:old-base (4) template-haskell (5) old-time (6) snap-0.12.0:old-base (7) xmlhtml (8) vector-algorithms (9) vector (10) unordered-containers (11) transformers (12) time (13) text (14) syb (15) snap-server (16) snap-core (17) regex-posix (18) pwstore-fast (19) mwc-random (20) mtl (21) logict (22) heist (23) hashable (24) filepath (25) errors (26) dlist (27) directory-tree (28) directory (29) containers (30) configurator (31) comonad (32) clientsession (33) cereal (34) bytestring (35) attoparsec (36) aeson (37) MonadCatchIO-transformers > goto dlist dlist (needed by snap-0.12.0) (1) 0.5 (*) (2) 0.4.1 (F) (3) 0.4 (F) (4) 0.3.2 (F) (5) 0.3.1 (F) (6) 0.3 (F) (7) 0.2 (F) > 1 Missing dependencies (1) dlist-0.5:applicative-in-base (*) (2) dlist-0.5:applicative-in-base (3) directory-tree (4) directory (5) containers (6) configurator (7) comonad (8) clientsession (9) cereal (10) bytestring (11) attoparsec (12) aeson (13) MonadCatchIO-transformers > auto Created a valid installplan. Type install to install, or showPlan to review No choices left >
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