initial nix language support

data/playground/nix/asserts.nix

@@ -0,0 +1,25 @@
+# https://nixos.org/manual/nix/stable/language/constructs.html#assertions
+
+{ localServer ? false
+, httpServer ? false
+, sslSupport ? false
+, pythonBindings ? false
+, javaSwigBindings ? false
+, javahlBindings ? false
+, stdenv, fetchurl
+, openssl ? null, httpd ? null, db4 ? null, expat, swig ? null, j2sdk ? null
+}:
+
+assert localerver -> db4 != null;
+assert httpServer -> httpd != null && httpd.expat == expat;
+assert sslSupport -> openssl != null && (httpServer -> httpd.openssl == openssl);
+assert pythonBindings -> swig != null && swig.pythonSupport;
+assert javaSwigBindings -> swig != null && swig.javaSupport;
+assert javahlBindings -> j2sdk != null;
+
+stdenv.mkDerivation {
+  (name = "subversion-1.1.1";)
+  ...
+  openssl = if sslSupport then openssl else null;
+  ...
+}

data/playground/nix/attrsets.nix

@@ -0,0 +1,19 @@
+{
+    a = { a = b; c = d; };
+    a = {
+        a = b;
+        c = d;
+    };
+
+    a = {
+        a = {
+            b = 1; };
+
+        c = { d = [ "1" 2 ] };
+    };
+
+    a = rec {
+        a = b;
+        b = a + 1;
+    };
+}

data/playground/nix/comments.nix

@@ -0,0 +1,8 @@
+# Single-line comment
+/*
+ Multi-line comment
+*/
+{
+  a = b; # Inline comment (test)
+  b = c; # Inline comment 2
+}

data/playground/nix/complex.nix

@@ -0,0 +1,67 @@
+{
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-23.05";
+    home-manager = {
+      url = "github:nix-community/home-manager/release-23.05";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+
+  outputs = { self, nixpkgs, home-manager }:
+    let
+      mkHost = hostName: system:
+        (({ my-config, zfs-root, pkgs, system, ... }:
+          nixpkgs.lib.nixosSystem {
+            inherit system;
+            modules = [
+              # Module 0: zfs-root and my-config
+              ./modules
+
+              # Module 1: host-specific config, if exist
+              (if (builtins.pathExists
+                ./hosts/${hostName}/configuration.nix) then
+                (import ./hosts/${hostName}/configuration.nix { inherit pkgs; })
+              else
+                { })
+
+              # Module 2: entry point
+              (({ my-config, zfs-root, pkgs, lib, ... }: {
+                inherit my-config zfs-root;
+                system.configurationRevision = if (self ? rev) then
+                  self.rev
+                else
+                  throw "refuse to build: git tree is dirty";
+                system.stateVersion = "23.05";
+                imports = [
+                  "${nixpkgs}/nixos/modules/installer/scan/not-detected.nix"
+                  # "${nixpkgs}/nixos/modules/profiles/hardened.nix"
+                  # "${nixpkgs}/nixos/modules/profiles/qemu-guest.nix"
+                ];
+              }) {
+                inherit my-config zfs-root pkgs;
+                lib = nixpkgs.lib;
+              })
+
+              # Module 3: home-manager
+              home-manager.nixosModules.home-manager
+              {
+                home-manager.useGlobalPkgs = true;
+                home-manager.useUserPackages = true;
+              }
+
+              # Module 4: config shared by all hosts
+              (import ./configuration.nix { inherit pkgs; })
+            ];
+          })
+
+        # configuration input
+          (import ./hosts/${hostName} {
+            system = system;
+            pkgs = nixpkgs.legacyPackages.${system};
+          }));
+    in {
+      nixosConfigurations = {
+        exampleHost = mkHost "exampleHost" "x86_64-linux";
+      };
+    };
+}

data/playground/nix/functions.nix

@@ -0,0 +1,13 @@
+{
+  # Anonymous function
+  a = foo: (foo + 1);
+  x = a: b: a + b;
+
+  # Non-built-in function
+  ba = test( foo: bar: {
+    b = foo;
+  });
+
+  # Built-in function
+  x = map (x: y: x + x) [ 1 2 3 ];
+}

data/playground/nix/lists.nix

@@ -0,0 +1,7 @@
+{
+  foo = [ "a" a/b/c "b" ];
+  bar = [ A
+          B
+          C # foo
+          ];
+}

data/playground/nix/statements.nix

@@ -0,0 +1,36 @@
+{
+  key = if a then b else c;
+  key =
+    if a
+    then b
+    else c;
+
+  a = b; # Inline comment (test)
+  b = c; # Inline comment 2
+  a = 1 + 1;
+  a = a/b/c ? 0;
+  a = b: b + 1;
+
+  foo = let
+    a = b;
+    c = d;
+  in
+    {
+      output = b;
+    };
+
+  bar = let
+    a = 1;
+    b = 2;
+  in a + b;
+
+  bar =
+    with key;
+    let
+      a = key;
+    in
+      a;
+
+  a = x: x + 1;
+  b = x: y: x + y + 1;
+}

data/playground/nix/strings.nix

@@ -0,0 +1,13 @@
+{
+  a = "double quoted string";
+  b = ''two single quote string'';
+  c = ''
+    multi-line
+    quote string'';
+  d = "Interpolated ${value} string";
+  e = "Escaped \${string} ";
+  f = ''
+    "Nested"
+    string
+    '';
+}

packages/common/src/extensionDependencies.ts

@@ -6,6 +6,7 @@ export const extensionDependencies = [
   "scala-lang.scala", // scala
   "mrob95.vscode-talonscript", // talon
   "jrieken.vscode-tree-sitter-query", // scm
+  "bbenoist.nix", // nix
 
   // Necessary for the `drink cell` and `pour cell` tests
   "ms-toolsai.jupyter",

packages/cursorless-engine/src/processTargets/modifiers/surroundingPair/findSurroundingPairParseTreeBased.ts

@@ -66,7 +66,10 @@ export function findSurroundingPairParseTreeBased(
 ) {
   const document: TextDocument = editor.document;
 
-  const individualDelimiters = getIndividualDelimiters(delimiters);
+  const individualDelimiters = getIndividualDelimiters(
+    document.languageId,
+    delimiters,
+  );
 
   const delimiterTextToDelimiterInfoMap = Object.fromEntries(
     individualDelimiters.map((individualDelimiter) => [

packages/cursorless-engine/src/processTargets/modifiers/surroundingPair/findSurroundingPairTextBased.ts

@@ -74,7 +74,10 @@ export function findSurroundingPairTextBased(
   const document: TextDocument = editor.document;
   const fullRange = allowableRange ?? document.range;
 
-  const individualDelimiters = getIndividualDelimiters(delimiters);
+  const individualDelimiters = getIndividualDelimiters(
+    editor.document.languageId,
+    delimiters,
+  );
 
   const delimiterTextToDelimiterInfoMap = Object.fromEntries(
     individualDelimiters.map((individualDelimiter) => [

packages/cursorless-engine/src/processTargets/modifiers/surroundingPair/delimiterMaps.ts → packages/cursorless-engine/src/processTargets/modifiers/surroundingPair/getDelimiterMaps.ts

@@ -5,7 +5,7 @@ import {
 
 type IndividualDelimiterText = string | string[];
 
-export const delimiterToText: Record<
+const delimiterToText: Record<
   SimpleSurroundingPairName,
   [IndividualDelimiterText, IndividualDelimiterText]
 > = {
@@ -25,6 +25,26 @@ export const delimiterToText: Record<
   squareBrackets: ["[", "]"],
 };
 
+const delimiterToTextNix: Record<
+  SimpleSurroundingPairName,
+  [IndividualDelimiterText, IndividualDelimiterText]
+> = {
+  angleBrackets: [
+    ["</", "<"],
+    [">", "/>"],
+  ],
+  backtickQuotes: ["`", "`"],
+  curlyBrackets: [["{", "${"], "}"],
+  doubleQuotes: ['"', '"'],
+  escapedDoubleQuotes: ['\\"', '\\"'],
+  escapedParentheses: ["\\(", "\\)"],
+  escapedSquareBrackets: ["\\[", "\\]"],
+  escapedSingleQuotes: ["\\'", "\\'"],
+  parentheses: [["(", "$("], ")"],
+  singleQuotes: ["''", "''"],
+  squareBrackets: ["[", "]"],
+};
+
 export const leftToRightMap: Record<string, string> = Object.fromEntries(
   Object.values(delimiterToText),
 );
@@ -46,3 +66,22 @@ export const complexDelimiterMap: Record<
     "angleBrackets",
   ],
 };
+
+/**
+ * Given a language id, returns a list of all possible delimiters
+ * for that language.
+ * @param languageId The language id
+ * @returns A list of all possible delimiters for that language
+ */
+export function getSimpleDelimiterMap(
+  languageId: string,
+): Record<
+  SimpleSurroundingPairName,
+  [IndividualDelimiterText, IndividualDelimiterText]
+> {
+  if (languageId == "nix") {
+    return delimiterToTextNix;
+  } else {
+    return delimiterToText;
+  }
+}

packages/cursorless-engine/src/processTargets/modifiers/surroundingPair/getIndividualDelimiters.ts

@@ -1,6 +1,6 @@
 import { SimpleSurroundingPairName } from "@cursorless/common";
 import { IndividualDelimiter } from "./types";
-import { delimiterToText } from "./delimiterMaps";
+import { getSimpleDelimiterMap } from "./getDelimiterMaps";
 import { concat, uniq } from "lodash";
 import { isString } from "../../../util/type";
 
@@ -13,8 +13,10 @@ import { isString } from "../../../util/type";
  * @returns A list of information about all possible left / right delimiter instances
  */
 export function getIndividualDelimiters(
+  languageId: string,
   delimiters: SimpleSurroundingPairName[],
 ): IndividualDelimiter[] {
+  const delimiterToText = getSimpleDelimiterMap(languageId);
   return delimiters.flatMap((delimiter) => {
     const [leftDelimiter, rightDelimiter] = delimiterToText[delimiter];
 

packages/cursorless-engine/src/processTargets/modifiers/surroundingPair/index.ts

@@ -9,7 +9,7 @@ import getTextFragmentExtractor from "../../../languages/getTextFragmentExtracto
 import { Target } from "../../../typings/target.types";
 import { SurroundingPairTarget } from "../../targets";
 import { getContainingScopeTarget } from "../getContainingScopeTarget";
-import { complexDelimiterMap } from "./delimiterMaps";
+import { complexDelimiterMap } from "./getDelimiterMaps";
 import { SurroundingPairInfo } from "./extractSelectionFromSurroundingPairOffsets";
 import { findSurroundingPairParseTreeBased } from "./findSurroundingPairParseTreeBased";
 import { findSurroundingPairTextBased } from "./findSurroundingPairTextBased";

packages/cursorless-vscode-e2e/src/suite/fixtures/recorded/languages/nix/changeArg.yml

@@ -0,0 +1,27 @@
+languageId: nix
+command:
+  version: 6
+  spokenForm: change arg
+  action:
+    name: clearAndSetSelection
+    target:
+      type: primitive
+      modifiers:
+        - type: containingScope
+          scopeType: {type: argumentOrParameter}
+  usePrePhraseSnapshot: true
+initialState:
+  documentContents: |-
+    { pkgs, ... }:
+    { a = 1; }
+  selections:
+    - anchor: {line: 0, character: 10}
+      active: {line: 0, character: 10}
+  marks: {}
+finalState:
+  documentContents: |-
+    :
+    { a = 1; }
+  selections:
+    - anchor: {line: 0, character: 0}
+      active: {line: 0, character: 0}

packages/cursorless-vscode-e2e/src/suite/fixtures/recorded/languages/nix/changeArg2.yml

@@ -0,0 +1,27 @@
+languageId: nix
+command:
+  version: 6
+  spokenForm: change arg
+  action:
+    name: clearAndSetSelection
+    target:
+      type: primitive
+      modifiers:
+        - type: containingScope
+          scopeType: {type: argumentOrParameter}
+  usePrePhraseSnapshot: true
+initialState:
+  documentContents: |-
+    { pkgs, ... }:
+    { a = 1; }
+  selections:
+    - anchor: {line: 1, character: 4}
+      active: {line: 1, character: 4}
+  marks: {}
+finalState:
+  documentContents: |-
+    :
+    { a = 1; }
+  selections:
+    - anchor: {line: 0, character: 0}
+      active: {line: 0, character: 0}