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chore(nix-lib): Remove nixpkgs.nix

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It is no longer used
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Tom Hubrecht 2025-02-07 12:47:46 +01:00
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# SPDX-FileCopyrightText: 2024 Tom Hubrecht <tom.hubrecht@dgnum.eu>
#
# SPDX-License-Identifier: EUPL-1.2
###
# Collection of nixpkgs library functions, those are necessary for defining our own lib
#
# They have been simplified and builtins are used in some places, instead of lib shims.
rec {
/**
Does the same as the update operator '//' except that attributes are
merged until the given predicate is verified. The predicate should
accept 3 arguments which are the path to reach the attribute, a part of
the first attribute set and a part of the second attribute set. When
the predicate is satisfied, the value of the first attribute set is
replaced by the value of the second attribute set.
# Inputs
`pred`
: Predicate, taking the path to the current attribute as a list of strings for attribute names, and the two values at that path from the original arguments.
`lhs`
: Left attribute set of the merge.
`rhs`
: Right attribute set of the merge.
# Type
```
recursiveUpdateUntil :: ( [ String ] -> AttrSet -> AttrSet -> Bool ) -> AttrSet -> AttrSet -> AttrSet
```
# Examples
:::{.example}
## `lib.attrsets.recursiveUpdateUntil` usage example
```nix
recursiveUpdateUntil (path: l: r: path == ["foo"]) {
# first attribute set
foo.bar = 1;
foo.baz = 2;
bar = 3;
} {
#second attribute set
foo.bar = 1;
foo.quz = 2;
baz = 4;
}
=> {
foo.bar = 1; # 'foo.*' from the second set
foo.quz = 2; #
bar = 3; # 'bar' from the first set
baz = 4; # 'baz' from the second set
}
```
:::
*/
recursiveUpdateUntil =
pred: lhs: rhs:
let
f =
attrPath:
builtins.zipAttrsWith (
n: values:
let
here = attrPath ++ [ n ];
in
if builtins.length values == 1 || pred here (builtins.elemAt values 1) (builtins.head values) then
builtins.head values
else
f here values
);
in
f
[ ]
[
rhs
lhs
];
/**
A recursive variant of the update operator ‘//’. The recursion
stops when one of the attribute values is not an attribute set,
in which case the right hand side value takes precedence over the
left hand side value.
# Inputs
`lhs`
: Left attribute set of the merge.
`rhs`
: Right attribute set of the merge.
# Type
```
recursiveUpdate :: AttrSet -> AttrSet -> AttrSet
```
# Examples
:::{.example}
## `lib.attrsets.recursiveUpdate` usage example
```nix
recursiveUpdate {
boot.loader.grub.enable = true;
boot.loader.grub.device = "/dev/hda";
} {
boot.loader.grub.device = "";
}
returns: {
boot.loader.grub.enable = true;
boot.loader.grub.device = "";
}
```
:::
*/
recursiveUpdate =
lhs: rhs:
recursiveUpdateUntil (
_: lhs: rhs:
!(builtins.isAttrs lhs && builtins.isAttrs rhs)
) lhs rhs;
/**
Determine whether a string has given prefix.
# Inputs
`pref`
: Prefix to check for
`str`
: Input string
# Type
```
hasPrefix :: string -> string -> bool
```
# Examples
:::{.example}
## `lib.strings.hasPrefix` usage example
```nix
hasPrefix "foo" "foobar"
=> true
hasPrefix "foo" "barfoo"
=> false
```
:::
*/
hasPrefix = pref: str: (builtins.substring 0 (builtins.stringLength pref) str == pref);
/**
Escape occurrence of the elements of `list` in `string` by
prefixing it with a backslash.
# Inputs
`list`
: 1\. Function argument
`string`
: 2\. Function argument
# Type
```
escape :: [string] -> string -> string
```
# Examples
:::{.example}
## `lib.strings.escape` usage example
```nix
escape ["(" ")"] "(foo)"
=> "\\(foo\\)"
```
:::
*/
escape = list: builtins.replaceStrings list (builtins.map (c: "\\${c}") list);
/**
Convert a string `s` to a list of characters (i.e. singleton strings).
This allows you to, e.g., map a function over each character. However,
note that this will likely be horribly inefficient; Nix is not a
general purpose programming language. Complex string manipulations
should, if appropriate, be done in a derivation.
Also note that Nix treats strings as a list of bytes and thus doesn't
handle unicode.
# Inputs
`s`
: 1\. Function argument
# Type
```
stringToCharacters :: string -> [string]
```
# Examples
:::{.example}
## `lib.strings.stringToCharacters` usage example
```nix
stringToCharacters ""
=> [ ]
stringToCharacters "abc"
=> [ "a" "b" "c" ]
stringToCharacters "🦄"
=> [ "<EFBFBD>" "<EFBFBD>" "<EFBFBD>" "<EFBFBD>" ]
```
:::
*/
stringToCharacters = s: builtins.genList (p: builtins.substring p 1 s) (builtins.stringLength s);
/**
Turn a string `s` into an exact regular expression
# Inputs
`s`
: 1\. Function argument
# Type
```
escapeRegex :: string -> string
```
# Examples
:::{.example}
## `lib.strings.escapeRegex` usage example
```nix
escapeRegex "[^a-z]*"
=> "\\[\\^a-z]\\*"
```
:::
*/
escapeRegex = escape (stringToCharacters "\\[{()^$?*+|.");
/**
Appends string context from string like object `src` to `target`.
:::{.warning}
This is an implementation
detail of Nix and should be used carefully.
:::
Strings in Nix carry an invisible `context` which is a list of strings
representing store paths. If the string is later used in a derivation
attribute, the derivation will properly populate the inputDrvs and
inputSrcs.
# Inputs
`src`
: The string to take the context from. If the argument is not a string,
it will be implicitly converted to a string.
`target`
: The string to append the context to. If the argument is not a string,
it will be implicitly converted to a string.
# Type
```
addContextFrom :: string -> string -> string
```
# Examples
:::{.example}
## `lib.strings.addContextFrom` usage example
```nix
pkgs = import <nixpkgs> { };
addContextFrom pkgs.coreutils "bar"
=> "bar"
```
The context can be displayed using the `toString` function:
```nix
nix-repl> builtins.getContext (lib.strings.addContextFrom pkgs.coreutils "bar")
{
"/nix/store/m1s1d2dk2dqqlw3j90jl3cjy2cykbdxz-coreutils-9.5.drv" = { ... };
}
```
:::
*/
addContextFrom = src: target: builtins.substring 0 0 src + target;
/**
Cut a string with a separator and produces a list of strings which
were separated by this separator.
# Inputs
`sep`
: 1\. Function argument
`s`
: 2\. Function argument
# Type
```
splitString :: string -> string -> [string]
```
# Examples
:::{.example}
## `lib.strings.splitString` usage example
```nix
splitString "." "foo.bar.baz"
=> [ "foo" "bar" "baz" ]
splitString "/" "/usr/local/bin"
=> [ "" "usr" "local" "bin" ]
```
:::
*/
splitString =
sep: s:
let
splits = builtins.filter builtins.isString (
builtins.split (escapeRegex (builtins.toString sep)) (builtins.toString s)
);
in
builtins.map (addContextFrom s) splits;
/**
Remove duplicate elements from the `list`. O(n^2) complexity.
# Inputs
`list`
: Input list
# Type
```
unique :: [a] -> [a]
```
# Examples
:::{.example}
## `lib.lists.unique` usage example
```nix
unique [ 3 2 3 4 ]
=> [ 3 2 4 ]
```
:::
*/
unique = builtins.foldl' (acc: e: if builtins.elem e acc then acc else acc ++ [ e ]) [ ];
/**
Flip the order of the arguments of a binary function.
# Inputs
`f`
: 1\. Function argument
`a`
: 2\. Function argument
`b`
: 3\. Function argument
# Type
```
flip :: (a -> b -> c) -> (b -> a -> c)
```
# Examples
:::{.example}
## `lib.trivial.flip` usage example
```nix
flip concat [1] [2]
=> [ 2 1 ]
```
:::
*/
flip =
f: a: b:
f b a;
/**
`warn` *`message`* *`value`*
Print a warning before returning the second argument.
See [`builtins.warn`](https://nix.dev/manual/nix/latest/language/builtins.html#builtins-warn) (Nix >= 2.23).
On older versions, the Nix 2.23 behavior is emulated with [`builtins.trace`](https://nix.dev/manual/nix/latest/language/builtins.html#builtins-warn), including the [`NIX_ABORT_ON_WARN`](https://nix.dev/manual/nix/latest/command-ref/conf-file#conf-abort-on-warn) behavior, but not the `nix.conf` setting or command line option.
# Inputs
*`message`* (String)
: Warning message to print before evaluating *`value`*.
*`value`* (any value)
: Value to return as-is.
# Type
```
String -> a -> a
```
*/
warn =
# Since Nix 2.23, https://github.com/NixOS/nix/pull/10592
builtins.warn or (
let
mustAbort = builtins.elem (builtins.getEnv "NIX_ABORT_ON_WARN") [
"1"
"true"
"yes"
];
in
# Do not eta reduce v, so that we have the same strictness as `builtins.warn`.
msg: v:
# `builtins.warn` requires a string message, so we enforce that in our implementation, so that callers aren't accidentally incompatible with newer Nix versions.
assert builtins.isString msg;
if mustAbort then
builtins.trace "evaluation warning: ${msg}" (
abort "NIX_ABORT_ON_WARN=true; warnings are treated as unrecoverable errors."
)
else
builtins.trace "evaluation warning: ${msg}" v
);
}