diff options
Diffstat (limited to 'nixpkgs/nixos/doc/manual/from_md/configuration/summary.section.xml')
| -rw-r--r-- | nixpkgs/nixos/doc/manual/from_md/configuration/summary.section.xml | 332 |
1 files changed, 0 insertions, 332 deletions
diff --git a/nixpkgs/nixos/doc/manual/from_md/configuration/summary.section.xml b/nixpkgs/nixos/doc/manual/from_md/configuration/summary.section.xml deleted file mode 100644 index 96a178c4930e..000000000000 --- a/nixpkgs/nixos/doc/manual/from_md/configuration/summary.section.xml +++ /dev/null @@ -1,332 +0,0 @@ -<section xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xml:id="sec-nix-syntax-summary"> - <title>Syntax Summary</title> - <para> - Below is a summary of the most important syntactic constructs in the - Nix expression language. It’s not complete. In particular, there are - many other built-in functions. See the - <link xlink:href="https://nixos.org/nix/manual/#chap-writing-nix-expressions">Nix - manual</link> for the rest. - </para> - <informaltable> - <tgroup cols="2"> - <colspec align="left" /> - <colspec align="left" /> - <thead> - <row> - <entry> - Example - </entry> - <entry> - Description - </entry> - </row> - </thead> - <tbody> - <row> - <entry> - <emphasis>Basic values</emphasis> - </entry> - <entry> - </entry> - </row> - <row> - <entry> - <literal>"Hello world"</literal> - </entry> - <entry> - A string - </entry> - </row> - <row> - <entry> - <literal>"${pkgs.bash}/bin/sh"</literal> - </entry> - <entry> - A string containing an expression (expands to - <literal>"/nix/store/hash-bash-version/bin/sh"</literal>) - </entry> - </row> - <row> - <entry> - <literal>true</literal>, <literal>false</literal> - </entry> - <entry> - Booleans - </entry> - </row> - <row> - <entry> - <literal>123</literal> - </entry> - <entry> - An integer - </entry> - </row> - <row> - <entry> - <literal>./foo.png</literal> - </entry> - <entry> - A path (relative to the containing Nix expression) - </entry> - </row> - <row> - <entry> - <emphasis>Compound values</emphasis> - </entry> - <entry> - </entry> - </row> - <row> - <entry> - <literal>{ x = 1; y = 2; }</literal> - </entry> - <entry> - A set with attributes named <literal>x</literal> and - <literal>y</literal> - </entry> - </row> - <row> - <entry> - <literal>{ foo.bar = 1; }</literal> - </entry> - <entry> - A nested set, equivalent to - <literal>{ foo = { bar = 1; }; }</literal> - </entry> - </row> - <row> - <entry> - <literal>rec { x = "foo"; y = x + "bar"; }</literal> - </entry> - <entry> - A recursive set, equivalent to - <literal>{ x = "foo"; y = "foobar"; }</literal> - </entry> - </row> - <row> - <entry> - <literal>[ "foo" "bar" ]</literal> - </entry> - <entry> - A list with two elements - </entry> - </row> - <row> - <entry> - <emphasis>Operators</emphasis> - </entry> - <entry> - </entry> - </row> - <row> - <entry> - <literal>"foo" + "bar"</literal> - </entry> - <entry> - String concatenation - </entry> - </row> - <row> - <entry> - <literal>1 + 2</literal> - </entry> - <entry> - Integer addition - </entry> - </row> - <row> - <entry> - <literal>"foo" == "f" + "oo"</literal> - </entry> - <entry> - Equality test (evaluates to <literal>true</literal>) - </entry> - </row> - <row> - <entry> - <literal>"foo" != "bar"</literal> - </entry> - <entry> - Inequality test (evaluates to <literal>true</literal>) - </entry> - </row> - <row> - <entry> - <literal>!true</literal> - </entry> - <entry> - Boolean negation - </entry> - </row> - <row> - <entry> - <literal>{ x = 1; y = 2; }.x</literal> - </entry> - <entry> - Attribute selection (evaluates to <literal>1</literal>) - </entry> - </row> - <row> - <entry> - <literal>{ x = 1; y = 2; }.z or 3</literal> - </entry> - <entry> - Attribute selection with default (evaluates to - <literal>3</literal>) - </entry> - </row> - <row> - <entry> - <literal>{ x = 1; y = 2; } // { z = 3; }</literal> - </entry> - <entry> - Merge two sets (attributes in the right-hand set taking - precedence) - </entry> - </row> - <row> - <entry> - <emphasis>Control structures</emphasis> - </entry> - <entry> - </entry> - </row> - <row> - <entry> - <literal>if 1 + 1 == 2 then "yes!" else "no!"</literal> - </entry> - <entry> - Conditional expression - </entry> - </row> - <row> - <entry> - <literal>assert 1 + 1 == 2; "yes!"</literal> - </entry> - <entry> - Assertion check (evaluates to - <literal>"yes!"</literal>). See - <xref linkend="sec-assertions" /> for using assertions in - modules - </entry> - </row> - <row> - <entry> - <literal>let x = "foo"; y = "bar"; in x + y</literal> - </entry> - <entry> - Variable definition - </entry> - </row> - <row> - <entry> - <literal>with pkgs.lib; head [ 1 2 3 ]</literal> - </entry> - <entry> - Add all attributes from the given set to the scope - (evaluates to <literal>1</literal>) - </entry> - </row> - <row> - <entry> - <emphasis>Functions (lambdas)</emphasis> - </entry> - <entry> - </entry> - </row> - <row> - <entry> - <literal>x: x + 1</literal> - </entry> - <entry> - A function that expects an integer and returns it increased - by 1 - </entry> - </row> - <row> - <entry> - <literal>(x: x + 1) 100</literal> - </entry> - <entry> - A function call (evaluates to 101) - </entry> - </row> - <row> - <entry> - <literal>let inc = x: x + 1; in inc (inc (inc 100))</literal> - </entry> - <entry> - A function bound to a variable and subsequently called by - name (evaluates to 103) - </entry> - </row> - <row> - <entry> - <literal>{ x, y }: x + y</literal> - </entry> - <entry> - A function that expects a set with required attributes - <literal>x</literal> and <literal>y</literal> and - concatenates them - </entry> - </row> - <row> - <entry> - <literal>{ x, y ? "bar" }: x + y</literal> - </entry> - <entry> - A function that expects a set with required attribute - <literal>x</literal> and optional <literal>y</literal>, - using <literal>"bar"</literal> as default value - for <literal>y</literal> - </entry> - </row> - <row> - <entry> - <literal>{ x, y, ... }: x + y</literal> - </entry> - <entry> - A function that expects a set with required attributes - <literal>x</literal> and <literal>y</literal> and ignores - any other attributes - </entry> - </row> - <row> - <entry> - <literal>{ x, y } @ args: x + y</literal> - </entry> - <entry> - A function that expects a set with required attributes - <literal>x</literal> and <literal>y</literal>, and binds the - whole set to <literal>args</literal> - </entry> - </row> - <row> - <entry> - <emphasis>Built-in functions</emphasis> - </entry> - <entry> - </entry> - </row> - <row> - <entry> - <literal>import ./foo.nix</literal> - </entry> - <entry> - Load and return Nix expression in given file - </entry> - </row> - <row> - <entry> - <literal>map (x: x + x) [ 1 2 3 ]</literal> - </entry> - <entry> - Apply a function to every element of a list (evaluates to - <literal>[ 2 4 6 ]</literal>) - </entry> - </row> - </tbody> - </tgroup> - </informaltable> -</section> |