Julien Malka
d05fcb7e2c
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416 lines
8.1 KiB
Nix
416 lines
8.1 KiB
Nix
###
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# Collection of nixpkgs library functions, those are necessary for defining our own lib
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#
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# They have been simplified and builtins are used in some places, instead of lib shims.
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rec {
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/**
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Does the same as the update operator '//' except that attributes are
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merged until the given predicate is verified. The predicate should
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accept 3 arguments which are the path to reach the attribute, a part of
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the first attribute set and a part of the second attribute set. When
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the predicate is satisfied, the value of the first attribute set is
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replaced by the value of the second attribute set.
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# Inputs
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`pred`
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: 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.
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`lhs`
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: Left attribute set of the merge.
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`rhs`
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: Right attribute set of the merge.
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# Type
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```
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recursiveUpdateUntil :: ( [ String ] -> AttrSet -> AttrSet -> Bool ) -> AttrSet -> AttrSet -> AttrSet
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```
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# Examples
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:::{.example}
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## `lib.attrsets.recursiveUpdateUntil` usage example
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```nix
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recursiveUpdateUntil (path: l: r: path == ["foo"]) {
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# first attribute set
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foo.bar = 1;
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foo.baz = 2;
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bar = 3;
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} {
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#second attribute set
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foo.bar = 1;
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foo.quz = 2;
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baz = 4;
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}
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=> {
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foo.bar = 1; # 'foo.*' from the second set
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foo.quz = 2; #
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bar = 3; # 'bar' from the first set
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baz = 4; # 'baz' from the second set
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}
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```
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:::
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*/
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recursiveUpdateUntil =
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pred: lhs: rhs:
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let
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f =
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attrPath:
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builtins.zipAttrsWith (
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n: values:
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let
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here = attrPath ++ [ n ];
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in
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if builtins.length values == 1 || pred here (builtins.elemAt values 1) (builtins.head values) then
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builtins.head values
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else
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f here values
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);
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in
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f [ ] [
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rhs
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lhs
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];
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/**
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A recursive variant of the update operator ‘//’. The recursion
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stops when one of the attribute values is not an attribute set,
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in which case the right hand side value takes precedence over the
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left hand side value.
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# Inputs
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`lhs`
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: Left attribute set of the merge.
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`rhs`
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: Right attribute set of the merge.
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# Type
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```
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recursiveUpdate :: AttrSet -> AttrSet -> AttrSet
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```
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# Examples
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:::{.example}
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## `lib.attrsets.recursiveUpdate` usage example
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```nix
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recursiveUpdate {
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boot.loader.grub.enable = true;
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boot.loader.grub.device = "/dev/hda";
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} {
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boot.loader.grub.device = "";
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}
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returns: {
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boot.loader.grub.enable = true;
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boot.loader.grub.device = "";
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}
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```
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:::
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*/
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recursiveUpdate =
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lhs: rhs:
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recursiveUpdateUntil (
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_: lhs: rhs:
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!(builtins.isAttrs lhs && builtins.isAttrs rhs)
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) lhs rhs;
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/**
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Determine whether a string has given prefix.
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# Inputs
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`pref`
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: Prefix to check for
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`str`
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: Input string
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# Type
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```
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hasPrefix :: string -> string -> bool
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```
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# Examples
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:::{.example}
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## `lib.strings.hasPrefix` usage example
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```nix
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hasPrefix "foo" "foobar"
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=> true
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hasPrefix "foo" "barfoo"
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=> false
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```
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:::
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*/
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hasPrefix = pref: str: (builtins.substring 0 (builtins.stringLength pref) str == pref);
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/**
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Escape occurrence of the elements of `list` in `string` by
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prefixing it with a backslash.
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# Inputs
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`list`
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: 1\. Function argument
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`string`
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: 2\. Function argument
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# Type
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```
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escape :: [string] -> string -> string
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```
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# Examples
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:::{.example}
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## `lib.strings.escape` usage example
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```nix
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escape ["(" ")"] "(foo)"
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=> "\\(foo\\)"
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```
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:::
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*/
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escape = list: builtins.replaceStrings list (builtins.map (c: "\\${c}") list);
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/**
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Convert a string `s` to a list of characters (i.e. singleton strings).
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This allows you to, e.g., map a function over each character. However,
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note that this will likely be horribly inefficient; Nix is not a
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general purpose programming language. Complex string manipulations
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should, if appropriate, be done in a derivation.
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Also note that Nix treats strings as a list of bytes and thus doesn't
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handle unicode.
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# Inputs
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`s`
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: 1\. Function argument
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# Type
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```
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stringToCharacters :: string -> [string]
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```
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# Examples
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:::{.example}
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## `lib.strings.stringToCharacters` usage example
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```nix
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stringToCharacters ""
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=> [ ]
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stringToCharacters "abc"
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=> [ "a" "b" "c" ]
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stringToCharacters "🦄"
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=> [ "<EFBFBD>" "<EFBFBD>" "<EFBFBD>" "<EFBFBD>" ]
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```
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:::
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*/
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stringToCharacters = s: builtins.genList (p: builtins.substring p 1 s) (builtins.stringLength s);
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/**
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Turn a string `s` into an exact regular expression
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# Inputs
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`s`
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: 1\. Function argument
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# Type
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```
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escapeRegex :: string -> string
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```
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# Examples
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:::{.example}
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## `lib.strings.escapeRegex` usage example
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```nix
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escapeRegex "[^a-z]*"
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=> "\\[\\^a-z]\\*"
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```
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:::
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*/
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escapeRegex = escape (stringToCharacters "\\[{()^$?*+|.");
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/**
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Appends string context from string like object `src` to `target`.
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:::{.warning}
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This is an implementation
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detail of Nix and should be used carefully.
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:::
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Strings in Nix carry an invisible `context` which is a list of strings
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representing store paths. If the string is later used in a derivation
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attribute, the derivation will properly populate the inputDrvs and
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inputSrcs.
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# Inputs
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`src`
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: The string to take the context from. If the argument is not a string,
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it will be implicitly converted to a string.
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`target`
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: The string to append the context to. If the argument is not a string,
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it will be implicitly converted to a string.
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# Type
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```
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addContextFrom :: string -> string -> string
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```
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# Examples
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:::{.example}
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## `lib.strings.addContextFrom` usage example
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```nix
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pkgs = import <nixpkgs> { };
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addContextFrom pkgs.coreutils "bar"
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=> "bar"
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```
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The context can be displayed using the `toString` function:
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```nix
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nix-repl> builtins.getContext (lib.strings.addContextFrom pkgs.coreutils "bar")
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{
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"/nix/store/m1s1d2dk2dqqlw3j90jl3cjy2cykbdxz-coreutils-9.5.drv" = { ... };
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}
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```
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:::
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*/
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addContextFrom = src: target: builtins.substring 0 0 src + target;
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/**
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Cut a string with a separator and produces a list of strings which
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were separated by this separator.
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# Inputs
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`sep`
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: 1\. Function argument
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`s`
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: 2\. Function argument
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# Type
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```
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splitString :: string -> string -> [string]
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```
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# Examples
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:::{.example}
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## `lib.strings.splitString` usage example
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```nix
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splitString "." "foo.bar.baz"
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=> [ "foo" "bar" "baz" ]
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splitString "/" "/usr/local/bin"
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=> [ "" "usr" "local" "bin" ]
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```
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:::
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*/
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splitString =
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sep: s:
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let
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splits = builtins.filter builtins.isString (
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builtins.split (escapeRegex (builtins.toString sep)) (builtins.toString s)
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);
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in
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builtins.map (addContextFrom s) splits;
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/**
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Remove duplicate elements from the `list`. O(n^2) complexity.
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# Inputs
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`list`
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: Input list
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# Type
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```
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unique :: [a] -> [a]
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```
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# Examples
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:::{.example}
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## `lib.lists.unique` usage example
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```nix
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unique [ 3 2 3 4 ]
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=> [ 3 2 4 ]
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```
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:::
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*/
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unique = builtins.foldl' (acc: e: if builtins.elem e acc then acc else acc ++ [ e ]) [ ];
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/**
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Flip the order of the arguments of a binary function.
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# Inputs
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`f`
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: 1\. Function argument
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`a`
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: 2\. Function argument
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`b`
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: 3\. Function argument
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# Type
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```
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flip :: (a -> b -> c) -> (b -> a -> c)
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```
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# Examples
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:::{.example}
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## `lib.trivial.flip` usage example
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```nix
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flip concat [1] [2]
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=> [ 2 1 ]
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```
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:::
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*/
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flip =
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f: a: b:
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f b a;
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}
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