Nix-writers: Difference between revisions

VisualWikitext

@@ Line 1: / Line 1: @@
 Nix-writers are a way to write other programming languages inline in nix-code.
-Basically it's like writeScript/writeScriptBin but for other Languages.
+They are like writeScript/writeScriptBin but for other languages.
 Every writer has a ...Bin variant which can be used inside environment.systemPackages.
 Most of the writers take an attrributeset where one can add libraries.
+These are declared in [https://github.com/NixOS/nixpkgs/blob/master/pkgs/build-support/writers/scripts.nix <code>/pkgs/build-support/writers/scripts.nix</code>].
 == Languages ==
@@ Line 14: / Line 16: @@
 pkgs.writers.writeBash "hello_world" ''
    echo 'hello world!'
-''
-</syntaxHighlight>
-===C===
-<syntaxHighlight lang=nix>
-pkgs.writers.writeC "hello-world-ncurses" { libraries = [ pkgs.ncurses ]; } ''
-  #include <ncurses.h>
-  int main() {
-    initscr();
-    printw("Hello World !!!");
-    refresh(); endwin();
-    return 0;
-  }
 ''
 </syntaxHighlight>
@@ Line 41: / Line 29: @@
 ===Haskell===
+<syntaxHighlight lang=nix>
+writeHaskell "missiles" {
+  libraries = [ pkgs.haskellPackages.acme-missiles ];
+} ''
+  import Acme.Missiles
+  main = launchMissiles
+''
+</syntaxHighlight>
 ===JavaScript===
+<syntaxHighlight lang=nix>
+writeJS "example" {
+  libraries = [ pkgs.nodePackages.uglify-js ];
+} ''
+  var UglifyJS = require("uglify-js");
+  var code = "function add(first, second) { return first + second; }";
+  var result = UglifyJS.minify(code);
+  console.log(result.code);
+''
+</syntaxHighlight>
 ===Perl===
+<syntaxHighlight lang=nix>
+writePerl "example" {
+  libraries = [ pkgs.perlPackages.boolean ];
+} ''
+  use boolean;
+  print "Howdy!\n" if true;
+''
+</syntaxHighlight>
 ===Python2===
+<syntaxHighlight lang=nix>
+writePython2 "test_python2" {
+  deps = [ pkgs.python2Packages.enum ];
+} ''
+  from enum import Enum
+  class Test(Enum):
+      a = "success"
+  print Test.a
+''
+</syntaxHighlight>
 ===Python3===
+<syntaxHighlight lang=nix>
+writePython3 "test_python3" {
+  libraries = [ pkgs.python3Packages.pyyaml ];
+} ''
+  import yaml
+  y = yaml.load("""
+    - test: success
+  """)
+  print(y[0]['test'])
+''
+</syntaxHighlight>
+To disable errors use 'flakeIgnore' like this:
+<syntaxHighlight lang=nix>
+writePython3 "test_python3" {
+  libraries = [ pkgs.python3Packages.pyyaml ];
+  flakeIgnore = [ "E265" "E225" ];
+} ''
+  import yaml
+  y = yaml.load("""
+    - test: success
+  """)
+  print(y[0]['test'])
+''
+</syntaxHighlight>
+[[Category:Nix Language]]