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Author SHA1 Message Date
Alyssa Ross 81e1e68eaf lib.trivial.warnIf: init
It's a common pattern in Nixpkgs to want to emit a warning in certain
cases, but not actually change behaviours.

This is often expressed as either
	if cond then lib.warn "Don't do that thing" x else x
Or
	(if cond then lib.warn "Don't do that thing" else lib.id) x

Neither of which really expresses the intent here, because it looks
like 'x' is being chosen conditionally.

To make this clearer, I introduce a "warnIf" function, which makes it
clear that the only thing being affected by the condition is whether
the warning is generated, not the value being returned.
2021-04-28 21:44:21 +00:00
Jacek Galowicz 123045a570 lib/attrsets: add cartesianProductOfSets function 2021-01-28 23:08:59 +01:00
Profpatsch 41e13149f7 lib/debug: add traceFnSeqN
Immensely helpful when you want to see the changes a function makes to
its value as it passes through.

Example:

```
$ nix-instantiate --strict --eval -E '(with import ./lib; traceFnSeqN 2 "id" (x: x) { a.b.c = 3; })'
trace: {
  fn = "id";
  from = {
    a = {
      b = {…};
    };
  };
  to = {
    a = {
      b = {…};
    };
  };
}
{ a = { b = { c = 3; }; }; }
```
2021-01-25 19:25:50 +01:00
John Ericson a6218c058b lib: Create makeScopeWithSplicing
It's ugly as hell, but I suppose it is needed to codify how to make
spliced package sets.
2020-11-19 00:07:14 -05:00
Joe Hermaszewski c3b35f21f7 lib: Add composeManyExtensions 2020-11-13 21:37:57 +01:00
Robert Hensing fe4a58eec0 lib: Add lib.trace for consistency
This puts it among the trace* family of functions derived from it.
2020-10-22 13:46:48 +02:00
Robert Hensing 9a4bed1a80 lib: Add lib.isFloat for consistency
Unlike the other three is* functions in lib.trivial, it was only
available as lib.trivial.isFloat
2020-10-22 13:46:48 +02:00
Robert Hensing afa6c51f27 lib: Use Nix's static scope checking, fix error message, optimize
Nix can perform static scope checking, but whenever code is inside
a `with` expression, the analysis breaks down, because it can't
know statically what's in the attribute set whose attributes were
brought into scope. In those cases, Nix has to assume that
everything works out.

Except it doesnt. Removing `with` from lib/ revealed an undefined
variable in an error message.

If that doesn't convince you that we're better off without `with`,
I can tell you that this PR results in a 3% evaluation performance
improvement because Nix can look up local variables by index.
This adds up with applications like the module system.

Furthermore, removing `with` makes the binding site of each
variable obvious, which helps with comprehension.
2020-10-22 13:46:47 +02:00
zimbatm 947a7d33f9
lib: add importTOML
Complements the `lib.importJSON`. `builtins.readTOML` has been
introduced in Nix 2.1.
2020-09-12 16:37:50 +02:00
Bas van Dijk 6e7822b8f3 lib: toHex -> toHexString & toBase -> toBaseDigits
This makes the type of these functions more apparent from the name.
2020-07-20 13:14:19 +02:00
Bas van Dijk 00022fbeda lib: add the toHex and toBase utility functions
`toHex` converts the given positive integer to a string of the hexadecimal
representation of that integer. For example:

```
toHex 0 => "0"

toHex 16 => "10"

toHex 250 => "FA"
```

`toBase base i` converts the positive integer `i` to a list of it
digits in the given `base`. For example:

```
toBase 10 123 => [ 1 2 3 ]

toBase 2 6 => [ 1 1 0 ]

toBase 16 250 => [ 15 10 ]
```
2020-07-20 13:09:26 +02:00
rnhmjoj 986079275b
lib/attrsets: add getMan function 2020-06-18 10:16:57 +02:00
Emily aff9979170 lib.fake{Sri => Hash}: fix and rename
The previous hash was too short and caused evaluation-time errors like:

    invalid SRI hash 'sha256-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA='

Additionally, since the fact that this is broken implies that nobody
could have been using it, "SRI" is a bit of a vague and obscure term,
`fakeSriHash` would be somewhat of a mouthful, and the relevant fetcher
parameters are just called `hash`, rename it to `fakeHash`.
2020-05-11 23:11:12 +01:00
Tony Olagbaiye d2ba3fba69 lib: add shortcut for fake SRI hash 2020-04-05 01:48:20 +01:00
Silvan Mosberger eff447b321
Merge pull request #70157 from teto/lib_kernel
Add lib.kernel
2020-03-12 23:53:42 +01:00
Jan Tojnar 8515b703cf
Merge pull request #72125 from jtojnar/maintainer-groups
lib: Add lib.maintainer-groups
2020-03-10 21:09:33 +01:00
Robert Hensing e38a01db5d
Merge pull request #68491 from roberth/fix-dontRecurseIntoAttrs
Fix dontRecurseIntoAttrs + add to lib + doc
2020-03-01 11:05:34 +01:00
Profpatsch 07eb21ceaf
Merge pull request #78337 from Profpatsch/lib-improve-cli-module
lib: improve cli module
2020-01-24 21:05:53 +01:00
Profpatsch 88a7f65c83 lib/cli: unexport symbols & sort with generators
lib/cli is very similar to generators, so it should follow largely the
same interface. Similar to how generators isn’t exported, we should
also namespace cli by default (plus “cli” is only three characters to
type).
2020-01-23 14:47:38 +01:00
Franz Pletz 46773a15b3
nixos/version: fix case where .git is a symlink
Before c9214c394b and
9d396d2e42 if .git is symlink the version
would gracefully default to no git revision. With those changes an
exception is thrown instead.

This introduces a new function `pathIsGitRepo` that checks if
`commitIdFromGitRepo` fails without error so we don't have to
reimplement this logic again and can fail gracefully.
2020-01-20 00:53:44 +01:00
Robert Hensing 8da81465c1
Merge pull request #75539 from Gabriel439/gabriel/renderOptions
Add `pkgs.lib.encodeGNUCommandLine`
2020-01-14 12:04:05 +01:00
elseym c9214c394b
lib.commitIdFromGitRepo: support git-worktree
lib.commitIdFromGitRepo now resolves the refs from the
parent repository in case the supplied path is a file
containing the path to said repository. this adds support
for git-worktree and things alike. see gitrepository-layout(5).

this also:
- adds a new boolean function lib.pathIsRegularFile to
  check whether a path is a regular file
- patches lib.revisionWithDefault and
  the revision and versionSuffix attributes in
  config.system.nixos in order to support git-worktrees
2020-01-10 22:29:48 +01:00
Silvan Mosberger de5f73d434
lib/modules: Recursive disabledModules
With this change, disabledModules applies recursively, meaning if you
have a module "foo.nix" with

    imports = [ ./bar.nix ];

then setting

  disabledModules = [ "foo.nix" ];

will disable both "foo.nix" and "bar.nix", whereas previously only
"foo.nix" would be disabled.

This change along with https://github.com/NixOS/nixpkgs/pull/61570 allows
modules to be fully disabled even when they have some `mkRenamedOption`
imports.
2020-01-09 17:26:05 +01:00
Gabriel Gonzalez a46679facd
Export toGNUCommandLine
... as suggested by @roberth

Co-Authored-By: Robert Hensing <roberth@users.noreply.github.com>
2020-01-05 14:44:42 -08:00
Silvan Mosberger 5414b4018b
lib/modules: Don't pack submodules specially
This has the beneficial side effect of allowing paths to be used as modules in
types.{submodule,submoduleWith}
2020-01-01 01:13:03 +01:00
Gabriel Gonzalez 8c6a05c8c9 Rename renderOptions to encodeGNUCommandLine
... as suggested by @edolstra
2019-12-13 18:19:24 -08:00
Gabriel Gonzalez 183a99734f Add pkgs.lib.renderOptions
This adds a new utility to intelligently convert Nix records to
command line options to reduce boilerplate for simple use cases and to
also reduce the likelihood of malformed command lines
2019-12-11 16:30:05 -08:00
John Ericson d0d5136cce Merge remote-tracking branch 'upstream/master' into wrapper-pname-support 2019-11-24 17:25:07 +00:00
John Ericson 84a105254d lib: Add getName to mirror getVersion 2019-11-24 16:24:50 +00:00
Jan Tojnar 10ac558ca1
lib: Add lib.teams
Also add a freedesktop maintainer group as an example.
2019-11-23 00:07:28 +01:00
Profpatsch 8252861507 lib/trivial: add pipe function
`pipe` is a useful operator for creating pipelines of functions.

It works around the usual problem of e.g. string operations becoming
deeply nested functions.

In principle, there are four different ways this function could be
written:

pipe val [ f1 .. fn ]
pipe val [ fn .. f1 ]
compose [ f1 .. fn ] val
compose [ fn .. f1 ] val

The third and fourth form mirror composition of functions, they would
be the same as e.g. `(f1 << f2 << f3 .. << fn) val`.
However, it is not clear which direction the list should have (as one
can see in the second form, which is the most absurd.

In order not to confuse users, we decide for the most “intuitive”
form, which mirrors the way unix pipes work (thus the name `pipe`).
The flow of data goes from left to right.

Co-Authored-By: Silvan Mosberger <infinisil@icloud.com>
2019-10-21 13:19:16 +02:00
Matthieu Coudron afa0e02d64 lib.kernel: make public
Remove the "version" parameter in order to make it more widely
available.
Starts making some kernel configuration helpers available.
The intent is to be able to better build and check the linux kernel
configuration.
2019-10-01 15:57:14 +09:00
Joachim Fasting fd3052901c
lib/versions: expose splitVersion 2019-09-26 17:42:42 +02:00
Robert Hensing fc64cf65ab top-level: Fix dontRecurseIntoAttrs and include in lib
dontRecurseIntoAttrs was a noop (x: x), causing the expression
dontRecurseIntoAttrs (recurseIntoAttrs a) to have the wrong effect.
2019-09-11 13:12:06 +02:00
Robert Hensing 8935bfb4ac lib: Add recurseIntoAttrs
This makes the function available without having to evaluate the
Nixpkgs fix-point, making it available in a more natural way for
code that deals with multiple Nixpkgs invocations.

Its definition is coupled to Nix rather than Nixpkgs, so it will
feel right at home in lib.
2019-09-11 13:12:06 +02:00
danbst 210c57883e and one more place 2019-08-05 14:14:40 +03:00
danbst 69920dafbf lib: introduce foreach = flip map
The main purpose is to bring attention to `flip map`, which improves
code readablity. It is useful when ad-hoc anonymous function
grows two or more lines in `map` application:

```
      map (lcfg:
        let port = lcfg.port;
            portStr = if port != defaultPort then ":${toString port}" else "";
            scheme = if cfg.enableSSL then "https" else "http";
        in "${scheme}://cfg.hostName${portStr}"
      ) (getListen cfg);
```
Compare this to `foreach`-style:
```
      foreach (getListen cfg) (lcfg:
        let port = lcfg.port;
            portStr = if port != defaultPort then ":${toString port}" else "";
            scheme = if cfg.enableSSL then "https" else "http";
        in "${scheme}://cfg.hostName${portStr}"
      );
```
This is similar to Haskell's `for` (http://hackage.haskell.org/package/base-4.12.0.0/docs/Data-Traversable.html#v:for)
2019-07-14 13:29:58 +03:00
Matthew Bauer a52e317200 check-meta: use system tuple in platforms
Fixes #60345
2019-04-30 12:59:03 -04:00
Corbin 5719f892e1 python: Make .isPyPy flag more accurate.
nix-repl> map (s: s.isPyPy) [ python python3 pypy pypy3 ]
[ false false true true ]
2019-04-09 20:41:08 +02:00
Jan Malakhovski 570aed4b46 lib: add showWarnings 2019-03-08 11:19:18 +02:00
(cdep)illabout 81fa1e392b lib/modules: Change mkAliasOptionModule to use the priority for the alias.
This commit changes the `mkAliasOptionModule` function to make sure that
the priority for the aliased option is propagated to the non-aliased
option.

This also affects the `mkRenamedOptionModule` function in a similar
fashion.

This also removes the `mkAliasOptionModuleWithPriority` function, since
its functionality is now subsumed by `mkAliasOptionModule`.

This change was recommended by @nbp:
https://github.com/NixOS/nixpkgs/pull/53397#discussion_r245487432
2019-01-24 13:02:16 +09:00
Michael Raskin 4d0e1b792f
Merge pull request #50561 from oxij/lib/setPrio
lib: implement `setPrio`
2019-01-18 08:23:31 +00:00
Nicolas B. Pierron a3beabf327
Merge pull request #53397 from cdepillabout/aliasoptionmodule-set-priority
lib/modules: Add function to create option alias that respects priority
2019-01-14 20:28:28 +01:00
Jörg Thalheim b75aff7202
Merge pull request #53754 from danbst/lib-fake-hashes
lib: add fake hashes
2019-01-10 17:56:09 +00:00
danbst 68a6b47b8c lib: add shortcuts for fake hashes (fakeSha256, fakeSha512)
Fake hashes can be used as placeholders for all the places, where
Nix expression requires a hash, but we don't yet have one.

This should be more convenient than following:
- echo|sha256sum, copy into clipboard, go to editor, paste into previously
  edited place
- search nixpkgs for a random package, copy it's hash to cliboard, go to
  editor, paste into previously edited place

Nix can add support for these fake hashes. In that case printed error should contain
only 1 hash, so no more problem "which of two hashes from error should I use?"

Idea by irc:Synthetica
2019-01-10 19:27:35 +02:00
(cdep)illabout b81b3ad1b0
lib/modules: Add a function to create an option alias that respects the priority
This commit adds a function `mkAliasOptionModuleWithPriority`.  This
function will make an alias to an existing option and copy over the
priority.

This functionality is needed for PRs like #53041.  In that case
`nixos-generate-config` added an option to `hardware-configuration.nix`
with `mkDefault`.  That option was then changed and an alias created for
the old name.

The end user should be able to set the non-alias option in their
`configuration.nix` and have everything work correctly.  Without this
function, the priority for the option won't be copied over correctly
and the end-user will get a message saying they have the same option
set to two different values.
2019-01-04 18:35:10 +09:00
Frederik Rietdijk 070290bda7 Merge master into staging-next 2018-12-31 12:00:36 +01:00
Frederik Rietdijk c6e043d57c Remove composableDerivation, closes #18763 2018-12-30 12:33:45 +00:00
volth fed7914539
Merge branch 'staging' into make-perl-pathd 2018-12-18 17:13:27 +00:00
volth bb9557eb7c lib.makePerlPath -> perlPackages.makePerlPath 2018-12-15 03:50:31 +00:00