Add a cabal target command #9744

philderbeast · 2024-02-26T19:39:40Z

Adds a cabal target command for showing targets that can be supplied to other commands like the cabal build command.

The initial motivation would have been #8953 but this is not a fix for that issue but it could be if the results are filtered. For example lib dependencies for all:tests are not filtered yet.

Related issues are #8683, #9732, #1382 and #4070.

I took the cabal build command and cut it short where it made a call to printPlan. The cabal target command calls printPlanTargetForms instead that is a modifiation of printPlan. Is there another way to get the targets (an easier way or a better way)?

Here's the help;

$ cabal --help
...
[running and testing]
  target                 List target forms within the project.
  list-bin               List the path to a single executable.
...
[new-style projects (forwards-compatible aliases)]
  v2-target              List target forms within the project.
  v2-build               Compile targets within the project.
...

Note

I've changed the above cabal --help to the following.

$ cabal --help
...
 [project building and installing]
  target                 Target disclosure.
  build                  Compile targets within the project.
...
 [new-style projects (forwards-compatible aliases)]
  v2-target              Target disclosure.
  v2-build               Compile targets within the project.
...

The command specific help, a lot of which is taken straight from the user guide on target forms;

$ cabal target --help
List target forms within the project.

Usage: cabal target [TARGETS]

List targets within a build plan. If no [TARGETS] are given 'all' will be used
for selecting a build plan.

The given target can be;
- a package target (e.g. [pkg:]package)
- a component target (e.g. [package:][ctype:]component)
- all packages (e.g. all)
- components of a particular type (e.g. package:ctypes or all:ctypes)
- a module target: (e.g. [package:][ctype:]module)
- a filepath target: (e.g. [package:][ctype:]filepath)
- a script target: (e.g. path/to/script)

The ctypes can be one of: libs or libraries, exes or executables, tests,
benches or benchmarks, and flibs or foreign-libraries.

Flags for target:
 -h, --help                     Show this help text

Examples:
  cabal target all
    List all targets of the package in the current directory or all packages in the project
  cabal target pkgname
    List targets of the package named pkgname in the project
  cabal target ./pkgfoo
    List targets of the package in the ./pkgfoo directory
  cabal target cname
    List targets of the component named cname in the project

Note

I've changed the above cabal target --help to the following.

$ cabal -- target --help
Target disclosure.

Usage: cabal target [TARGETS]

Reveal the targets of build plan. If no [TARGETS] are given 'all' will be used
for selecting a build plan.

A [TARGETS] item can be one of these target forms;
- a package target (e.g. [pkg:]package)
- a component target (e.g. [package:][ctype:]component)
- all packages (e.g. all)
- components of a particular type (e.g. package:ctypes or all:ctypes)
- a module target: (e.g. [package:][ctype:]module)
- a filepath target: (e.g. [package:][ctype:]filepath)
- a script target: (e.g. path/to/script)

The ctypes can be one of: libs or libraries, exes or executables, tests,
benches or benchmarks, and flibs or foreign-libraries.

Flags for target:
 -h, --help                     Show this help text

Examples:
  cabal target all
    Targets of the package in the current directory or all packages in the project
  cabal target pkgname
    Targets of the package named pkgname in the project
  cabal target ./pkgfoo
    Targets of the package in the ./pkgfoo directory
  cabal target cname
    Targets of the component named cname in the project

The command in action on the cabal project;

$ cabal target all
Resolving dependencies...
 - Cabal-QuickCheck:lib
 - Cabal-described:lib
 - Cabal-syntax:lib
 - Cabal-tests:lib
 - Cabal-tests:test:check-tests
 - Cabal-tests:test:custom-setup-tests
 - Cabal-tests:test:hackage-tests
 - Cabal-tests:test:no-thunks-test
 - Cabal-tests:test:parser-tests
 - Cabal-tests:test:rpmvercmp
 - Cabal-tests:test:unit-tests
 - Cabal-tree-diff:lib
 - Cabal:lib
 - cabal-benchmarks:test:cabal-benchmarks
 - cabal-install-solver:lib
 - cabal-install-solver:test:unit-tests
 - cabal-install:exe:cabal
 - cabal-install:lib
 - cabal-install:test:integration-tests2
 - cabal-install:test:long-tests
 - cabal-install:test:mem-use-tests
 - cabal-install:test:unit-tests
 - cabal-testsuite
 - hackage-security:lib
 - solver-benchmarks:exe:hackage-benchmark
 - solver-benchmarks:lib
 - solver-benchmarks:test:unit-tests

Notice that I'm not stripping out local dependencies that must also be built by the plan;

$ cabal run cabal -- target all:tests
Warning: this is a debug build of cabal-install with assertions enabled.
Resolving dependencies...
Warning: this is a debug build of cabal-install with assertions enabled.
Resolving dependencies...
 - Cabal-QuickCheck:lib
 - Cabal-described:lib
 - Cabal-syntax:lib
 - Cabal-tests:lib
 - Cabal-tests:test:check-tests
 - Cabal-tests:test:custom-setup-tests
 - Cabal-tests:test:hackage-tests
 - Cabal-tests:test:no-thunks-test
 - Cabal-tests:test:parser-tests
 - Cabal-tests:test:rpmvercmp
 - Cabal-tests:test:unit-tests
 - Cabal-tree-diff:lib
 - Cabal:lib
 - cabal-benchmarks:test:cabal-benchmarks
 - cabal-install-solver:lib
 - cabal-install-solver:test:unit-tests
 - cabal-install:lib
 - cabal-install:test:integration-tests2
 - cabal-install:test:long-tests
 - cabal-install:test:mem-use-tests
 - cabal-install:test:unit-tests
 - hackage-security:lib
 - solver-benchmarks:lib
 - solver-benchmarks:test:unit-tests

Patches conform to the coding conventions.
Any changes that could be relevant to users have been recorded in the changelog.
The documentation has been updated, if necessary.
Manual QA notes have been included.
Tests have been added.

fendor · 2024-02-26T19:51:18Z

Related PR: #7500

philderbeast · 2024-02-26T20:32:07Z

Thanks for the link @fendor. I can see you've put a lot of effort into a larger scoped change.

alt-romes · 2024-02-27T09:24:58Z

This looks plausible to me. We definitely need a test and changelog entry -- though I understand this only makes sense to do if the feature is generally agreed upon, which I can't guarantee by myself. I'll bring it up in the dev meeting on Thursday.

philderbeast · 2024-02-27T12:36:43Z

Because this uses --dry-run effectively, if dependencies haven't been built (I got there by changing branches, cabal clean won't invalidate already built dependencies) then these too will show up as targets.

Note

I'm suprised to see Cabal:lib there twice.

$ cabal target all
Resolving dependencies...
 - Cabal-QuickCheck:lib
 - Cabal-described:lib
 - Cabal-syntax:lib
 - Cabal-tests:lib
 - Cabal-tests:test:check-tests
 - Cabal-tests:test:custom-setup-tests
 - Cabal-tests:test:hackage-tests
 - Cabal-tests:test:no-thunks-test
 - Cabal-tests:test:parser-tests
 - Cabal-tests:test:rpmvercmp
 - Cabal-tests:test:unit-tests
 - Cabal-tree-diff:lib
 - Cabal:lib
 - Cabal:lib
 - Diff:lib
 - OneTuple:lib
 - QuickCheck:lib
 - StateVar:lib
 - aeson:lib
 - ansi-terminal-types:lib
 - ansi-terminal:lib
 - ansi-wl-pprint:lib
 - assoc:lib
 - attoparsec:lib
 - attoparsec:lib:attoparsec-internal
 - base-compat:lib
 - base-orphans:lib
 - bifunctors:lib
 - bitvec:lib
 - bytestring-builder:lib
 - cabal-benchmarks:test:cabal-benchmarks
 - cabal-install-solver:lib
 - cabal-install-solver:test:unit-tests
 - cabal-install:exe:cabal
 - cabal-install:lib
 - cabal-install:test:integration-tests2
 - cabal-install:test:long-tests
 - cabal-install:test:mem-use-tests
 - cabal-install:test:unit-tests
 - cabal-testsuite
 - call-stack:lib
 - charset:lib
 - clock:lib
 - colour:lib
 - comonad:lib
 - contravariant:lib
 - data-default-class(lib:data-default-class)
 - data-fix:lib
 - dense-linear-algebra:lib
 - distributive:lib
 - dlist:lib
 - generically:lib
 - hackage-security:lib
 - happy:exe:happy
 - haskell-lexer:lib
 - indexed-traversable-instances:lib
 - indexed-traversable:lib
 - integer-conversion:lib
 - integer-logarithms:lib
 - math-functions:lib
 - mtl-compat:lib
 - mwc-random:lib
 - network-wait:lib
 - nothunks:lib
 - optparse-applicative:lib
 - parallel:lib
 - parsers:lib
 - pretty-show:lib
 - prettyprinter-ansi-terminal:lib
 - prettyprinter-compat-ansi-wl-pprint:lib
 - prettyprinter:lib
 - primitive:lib
 - regex-tdfa:lib
 - rere:lib
 - retry:lib
 - scientific:lib
 - semialign:lib
 - semigroupoids:lib
 - solver-benchmarks:exe:hackage-benchmark
 - solver-benchmarks:lib
 - solver-benchmarks:test:unit-tests
 - statistics:lib
 - strict:lib
 - tagged:lib
 - tasty-bench:lib
 - tasty-expected-failure:lib
 - tasty-golden:lib
 - tasty-hunit:lib
 - tasty-quickcheck:lib
 - tasty:lib
 - temporary:lib
 - text-iso8601:lib
 - text-short:lib
 - th-abstraction:lib
 - these:lib
 - time-compat:lib
 - transformers-compat:lib
 - tree-diff:lib
 - typed-process:lib
 - unbounded-delays:lib
 - unliftio-core:lib
 - unordered-containers:lib
 - uuid-types:lib
 - vector-algorithms:lib
 - vector-binary-instances:lib
 - vector-stream:lib
 - vector-th-unbox:lib
 - vector:lib
 - wherefrom-compat:lib
 - witherable:lib

philderbeast · 2024-02-27T12:40:03Z

In investigating further, trying to build only the dependencies, I hit an error I've never seen before;

$ git rev-parse HEAD
6d9267d78b35c5075171309170825d42e4fd16e6

$ cabal build all --only-dependencies
Warning: this is a debug build of cabal-install with assertions enabled.
Error: [Cabal-7072]
Cannot select only the dependencies (as requested by the '--only-dependencies' flag),
the package Cabal-syntax-3.11.0.0 is required by a dependency of one of the other targets.

andreabedini · 2024-02-28T10:52:23Z

Maybe list-target(s)? It seems to follow naturally from the help message:

target                 List target forms within the project.
list-bin               List the path to a single executable.

Let me emphasise that those are only the targets within the project (as the help already points out) and that different commands can interpret their arguments more liberally (e.g. any package-id is a valid target for cabal install).

andreabedini · 2024-02-28T10:54:06Z

@philderbeast Ill give it a proper review ASAP

philderbeast · 2024-02-28T13:38:51Z

Maybe list-target(s)? It seems to follow naturally from the help message:
target                 List target forms within the project.
list-bin               List the path to a single executable.
Let me emphasise that those are only the targets within the project (as the help already points out) and that different commands can interpret their arguments more liberally (e.g. any package-id is a valid target for cabal install).

I dislike the list-bin command name and wish it was named something else, like bin-path. I went with target instead of targets because none of the other command names are plural. They're all verbs aren't they?

michaelpj · 2024-02-28T16:29:57Z

What about cabal target list? There is some consensus that subcommands with the form <cmd> <noun> <verb> are the way to go. But then perhaps "target" is not a noun that we want to attach many verbs to 🤷

andreasabel · 2024-02-29T19:04:48Z

Can we have a cabal list command that allows subcommands that all display some information about what cabal thinks about the world?

cabal list targets This PR.
cabal list bins Alt. name of cabal list-bin.
cabal list paths Alt. name of cabal path.
etc.

philderbeast · 2024-02-29T19:15:41Z

What about cabal target list?

Yes @michaelpj a subcommand instead is a possibility. As implemented this is acting as cabal build --dry-run but printing something different at the end, printing the targets rather than what would be built. So that would be something like cabal build --print-targets.

Mikolaj · 2024-03-05T21:02:10Z

I like cabal build --print-targets, because then we don't have to think whether it's going to be used a lot or only in very special circumstances (a top-level command would probably require establishing it's going to be used often enough). Maybe let's make it even more non-intrusive (though harder to use) and let cabal build --print-targets really build and then print the built targets (or separately the targets that are built and the targets that could be built) and cabal build --dry-run --print-targets show only all the possible targets? That's a more radical interpretation of your "but printing something different at the end" (or maybe it's "and printing some extra info at the end"). Makes sense? Then it's even more fine if the result with and without --dry-run or with and without stuff already built differs (cabal commands are stateful).

philderbeast · 2024-03-05T23:36:38Z

I favour --print-targets too. Saw that this is a new make option;

As of Jan 8th, 2024, Make has a --print-targets option that should do this properly without hacky regexes. The current version is Make 4.4.1 so the next release after that will have this feature.
SOURCE: How do you get the list of targets in a makefile?

michaelpj · 2024-03-06T08:49:23Z

-1 for attaching this to cabal build

Sometimes you don't want to build! Now you need cabal build --dont-build --print-targets. Yes, we already have --dry-run, but that's supposed to tell you what it was going to build, so how are we going to glue the output together? Awkward. It's just generally difficult making a command do double duty.
Most importantly, the targets are not uniquely associated with building. You can also use them in repl and many other commands. So do we add cabal repl --print-targets too? It's just not a build thing. In contrast, --dry-run tells you what would have been built, so really does make sense to belong to cabal build.

Make is different because a) it doesn't have sub-commands and b) the only operation on targets is building them.

Food for thought: https://doc.rust-lang.org/cargo/commands/cargo-metadata.html

philderbeast · 2024-03-06T13:55:01Z

My main motivation for this change, no matter which command or subcommand or option we put it under, is to help interactive use of cabal itself and not for producing a machine readable format for IDE tooling like the cabal status enchancement of #7500. Lots of commands take targets. This change shows me those targets.

fendor · 2024-03-10T17:07:30Z

I understand and support this motivation. cabal needs to be easier to hack around with. The cabal status command was also intended to improve the cabal UX, allowing exactly this use-case, but I deferred the decision of what the UX should look like, in favour of a well-defined machine-readable output.

I think we should avoid too many top-level commands, as I fear trouble down the line with UX and discoverability.

While cabal list is already taken as a command, perhaps cabal project targets could be nice?

philderbeast · 2024-03-17T15:26:04Z

perhaps cabal project targets could be nice?

We have targets when there is no actual project file, when there is just a .cabal file.

philderbeast · 2024-03-17T15:28:21Z

Most importantly, the targets are not uniquely associated with building.

So a top-level targets command makes sense, not subordinate to some other command.

philderbeast · 2024-03-17T15:32:10Z

What about cabal target list?

What else would we do with targets rather than list them that is not already covered by other commands taking targets? Perhaps we should pluralize it as cabal targets. We're asking them to identify themselves with this command.

Mikolaj · 2024-05-01T10:31:12Z

Let's keep discussing this. Does anybody remember the conclusions of the discussion of the command names (related to cabal path, but also more general) we had at the open fortnightly cabal devs meeting recently?

philderbeast · 2024-05-06T18:42:02Z

Can we have a cabal list command that allows subcommands that all display some information about what cabal thinks about the world?

cabal list targets This PR.

cabal list bins Alt. name of cabal list-bin.

cabal list paths Alt. name of cabal path.

etc.

@andreasabel are you suggesting we keep cabal target but also add cabal list targets?

    $ cabal list targets --help
    Target disclosure and synonym of command 'cabal target'.

-   Usage: cabal target [TARGETS]
+   Usage: cabal list targets [TARGETS]

    Reveal the targets of build plan. If no [TARGETS] are given 'all' will be used
    for selecting a build plan.

    A [TARGETS] item can be one of these target forms;
    - a package target (e.g. [pkg:]package)
    - a component target (e.g. [package:][ctype:]component)
    - all packages (e.g. all)
    - components of a particular type (e.g. package:ctypes or all:ctypes)
    - a module target: (e.g. [package:][ctype:]module)
    - a filepath target: (e.g. [package:][ctype:]filepath)
    - a script target: (e.g. path/to/script)

    The ctypes can be one of: libs or libraries, exes or executables, tests,
    benches or benchmarks, and flibs or foreign-libraries.

    Flags for target:
    -h, --help                     Show this help text

    Examples:
-   cabal target all
+   cabal list targets all
        Targets of the package in the current directory or all packages in the project
-   cabal target pkgname
+   cabal list targets pkgname
        Targets of the package named pkgname in the project
-   cabal target ./pkgfoo
+   cabal list targets ./pkgfoo
        Targets of the package in the ./pkgfoo directory
-   cabal target cname
+   cabal list targets cname
        Targets of the component named cname in the project

philderbeast · 2024-05-07T12:17:40Z

Because this uses --dry-run effectively, if dependencies haven't been built (I got there by changing branches, cabal clean won't invalidate already built dependencies) then these too will show up as targets.

I'm not sure about this. Even with haskell/containers@c651094 having been built, I'm seeing targets from dependencies shown in the output;

$ ghc --version
The Glorious Glasgow Haskell Compilation System, version 9.8.2

$ cabal build all --enable-tests --enable-benchmarks
Up to date

$ cabal target
 - ChasingBottoms:lib
 - QuickCheck:lib
 - binary:lib
 - containers-tests:bench:graph-benchmarks
 - containers-tests:bench:intmap-benchmarks
 - containers-tests:bench:intset-benchmarks
 - containers-tests:bench:lookupge-intmap
 - containers-tests:bench:lookupge-map
 - containers-tests:bench:map-benchmarks
 - containers-tests:bench:sequence-benchmarks
 - containers-tests:bench:set-benchmarks
 - containers-tests:bench:set-operations-intmap
 - containers-tests:bench:set-operations-intset
 - containers-tests:bench:set-operations-map
 - containers-tests:bench:set-operations-set
 - containers-tests:bench:tree-benchmarks
 - containers-tests:lib
 - containers-tests:test:bitqueue-properties
 - containers-tests:test:graph-properties
 - containers-tests:test:intmap-lazy-properties
 - containers-tests:test:intmap-strict-properties
 - containers-tests:test:intmap-strictness-properties
 - containers-tests:test:intset-properties
 - containers-tests:test:intset-strictness-properties
 - containers-tests:test:listutils-properties
 - containers-tests:test:map-lazy-properties
 - containers-tests:test:map-strict-properties
 - containers-tests:test:map-strictness-properties
 - containers-tests:test:seq-properties
 - containers-tests:test:set-properties
 - containers-tests:test:tree-properties
 - containers:lib
 - ghc-heap:lib
 - nothunks:lib
 - optparse-applicative:lib
 - prettyprinter-ansi-terminal:lib
 - prettyprinter:lib
 - tasty-bench:lib
 - tasty-hunit:lib
 - tasty-quickcheck:lib
 - tasty:lib
 - text:lib

andreabedini

If you want to obtain list the targets you probably do not need all most of targetAction.

withContextAndSelectors is what powers cabal run myscript.hs unless you want to support cabal target myscript.hs you won't need it. If you do not use it, cabal target will only work in a project context. This is what I would expect.

runProjectPreBuildPhase rebuilds the project plan and then uses the function you pass to trim it down to only the required targets. Again, if you just want to list the available targets, you don't need to trim anything. Also it marks the up-to-date targets as 'installed', which means you won't get them from InstallPlan.executionOrder.

Assuming I understand what you want to do, I think you need to:

use establishProjectBaseContext to read the project configuration
use rebuildInstallPlan to get the full plan
use readTargetSelectors to parse the target selector strings on the command line into a list of TargetSelector
use resolveTargets to resolve those target selectors against the plan

This gives you a TargetsMap associating each unit in the plan with a list of components and the matched selectors.

type TargetsMap = Map UnitId [(ComponentTarget, NonEmpty TargetSelector)]

I guess this is want you might want to display. You might need to lookup the unit ids in the plan again though, which is a bit annoying.

I hope I didn't misunderstood what you are trying to do.

andreabedini · 2024-06-27T02:31:54Z

cabal-install/src/Distribution/Client/ProjectOrchestration.hs

+  :: Verbosity
+  -> ProjectBuildContext
+  -> IO ()
+printPlanTargetForms


This function shows every single single component in elaboratedPlanToExecute. This does not correspond to the list of available targets.

E.g.

✦ ~/code/cabal branchless/09946f1d1fa1217f4480d9ac919e2b264b5a3ecb* λ $(cabal list-bin cabal) target ... - uuid-types:lib - vector-algorithms:lib - vector-binary-instances:lib - vector-stream:lib - vector-th-unbox:lib - vector:lib - wherefrom-compat:lib - witherable:lib - zinza:lib - zlib:lib ✦ ~/code/cabal branchless/09946f1d1fa1217f4480d9ac919e2b264b5a3ecb* 10s λ $(cabal list-bin cabal) build zlib:lib Warning: this is a debug build of cabal-install with assertions enabled. Error: [Cabal-7130] Internal error in target matching: could not make an unambiguous fully qualified target selector for 'zlib:lib'. We made the target 'zlib:lib' (unknown-component) that was expected to be unambiguous but matches the following targets: 'zlib:lib', matching: - zlib:lib (unknown-component) - :pkg:zlib:lib:zlib:file:lib (unknown-file) Note: Cabal expects to be able to make a single fully qualified name for a target or provide a more specific error. Our failure to do so is a bug in cabal. Tracking issue: https://github.com/haskell/cabal/issues/8684 Hint: this may be caused by trying to build a package that exists in the project directory but is missing from the 'packages' stanza in your cabal project file.

andreabedini · 2024-06-27T02:44:18Z

cabal-install/src/Distribution/Client/CmdTarget.hs

+  let targetStrings = if null ts then ["all"] else ts
+  withContextAndSelectors RejectNoTargets Nothing flags targetStrings globalFlags BuildCommand $ \targetCtx ctx targetSelectors -> do


Here you require (RejectNoTargets) a list of target selectors.Why?
I would think a command to list targets does not need targets to be specified.

If you want to just list the targets you probably do not need all most of this function, but only the elaborated plan.

withContextAndSelectors is what powers cabal run myscript.hs unless you want to support cabal target myscript.hs you won't need it. If you do not use it, cabal target will only work in a project context. This is what I would expect.

runProjectPreBuildPhase rebuilds the project plan and then uses the function you pass to trim it down to only the required targets. Again, if you just want to list the available targets, you don't need to trim anything. Also it marks the up-to-date targets as 'installed', which means you won't get them from InstallPlan.executionOrder.

philderbeast added the attention: needs-review label Feb 26, 2024

philderbeast requested review from ulysses4ever and andreabedini February 26, 2024 19:41

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philderbeast mentioned this pull request Mar 6, 2024

Global flags are in the way #9783

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philderbeast mentioned this pull request May 7, 2024

Fake package leaking when no [TARGETS] #9983

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philderbeast mentioned this pull request Jun 9, 2024

Document how to cache stack haskell-actions/setup#86

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ulysses4ever mentioned this pull request Aug 3, 2024

cabal list-bin can already list multiple binary but just refuses to #9732

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Add/command target backup #10600

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Add a cabal target command

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Avoid list in the help

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Add a cabal target command #9744

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		let targetStrings = if null ts then ["all"] else ts
		withContextAndSelectors RejectNoTargets Nothing flags targetStrings globalFlags BuildCommand $ \targetCtx ctx targetSelectors -> do

Add a cabal target command #9744

Are you sure you want to change the base?

Add a cabal target command #9744

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