opencode: add module

Seamlessly integrate the opencode AI assistant with Neovim — convenient
and editor-aware research, reviews, and requests.

plugins/by-name/opencode/default.nix

@@ -0,0 +1,36 @@
+{ lib, ... }:
+lib.nixvim.plugins.mkNeovimPlugin {
+  name = "opencode";
+  packPathName = "opencode.nvim";
+  package = "opencode-nvim";
+
+  maintainers = [ lib.maintainers.khaneliman ];
+
+  description = ''
+    OpenCode.nvim provides seamless integration with Claude Code for AI-assisted development.
+
+    > [!NOTE]
+    > Recommended: `snacks.enable` with `settings.input.enabled = true` for better prompt input
+    > Required: `snacks.enable` to use opencode.nvim's embedded terminal
+
+    > [!TIP]
+    > Set `opts.autoread = true` if using the `auto_reload` option.
+  '';
+
+  callSetup = false;
+  hasLuaConfig = false;
+  extraConfig = cfg: {
+    globals.opencode_opts = cfg.settings;
+  };
+
+  settingsExample = {
+    port = 8080;
+    auto_reload = false;
+    prompts = {
+      example = {
+        description = "An example prompt configuration";
+        prompt = "Write a function that returns the factorial of a number";
+      };
+    };
+  };
+}

tests/test-sources/plugins/by-name/opencode/default.nix

@@ -0,0 +1,95 @@
+{
+  empty = {
+    plugins.opencode.enable = true;
+  };
+
+  defaults = {
+    plugins.opencode = {
+      enable = true;
+      settings = {
+        port = null;
+        auto_reload = true;
+        auto_register_cmp_sources = [
+          "opencode"
+          "buffer"
+        ];
+        contexts = {
+          "@buffer" = {
+            description = "Current buffer";
+            value.__raw = ''require("opencode.context").buffer'';
+          };
+          "@buffers" = {
+            description = "Open buffers";
+            value.__raw = ''require("opencode.context").buffers'';
+          };
+          "@cursor" = {
+            description = "Cursor position";
+            value.__raw = ''require("opencode.context").cursor_position'';
+          };
+          "@selection" = {
+            description = "Selected text";
+            value.__raw = ''require("opencode.context").visual_selection'';
+          };
+          "@visible" = {
+            description = "Visible text";
+            value.__raw = ''require("opencode.context").visible_text'';
+          };
+          "@diagnostic" = {
+            description = "Current line diagnostics";
+            value.__raw = ''
+              function()
+                return require("opencode.context").diagnostics(true)
+              end
+            '';
+          };
+          "@diagnostics" = {
+            description = "Current buffer diagnostics";
+            value.__raw = ''require("opencode.context").diagnostics'';
+          };
+          "@quickfix" = {
+            description = "Quickfix list";
+            value.__raw = ''require("opencode.context").quickfix '';
+          };
+          "@diff" = {
+            description = "Git diff";
+            value.__raw = ''require("opencode.context").git_diff '';
+          };
+          "@grapple" = {
+            description = "Grapple tags";
+            value.__raw = ''require("opencode.context").grapple_tags '';
+          };
+        };
+        prompts = {
+          explain = {
+            description = "Explain code near cursor";
+            prompt = "Explain @cursor and its context";
+          };
+          fix = {
+            description = "Fix diagnostics";
+            prompt = "Fix these @diagnostics";
+          };
+          optimize = {
+            description = "Optimize selection";
+            prompt = "Optimize @selection for performance and readability";
+          };
+          document = {
+            description = "Document selection";
+            prompt = "Add documentation comments for @selection";
+          };
+          test = {
+            description = "Add tests for selection";
+            prompt = "Add tests for @selection";
+          };
+          review_buffer = {
+            description = "Review buffer";
+            prompt = "Review @buffer for correctness and readability";
+          };
+          review_diff = {
+            description = "Review git diff";
+            prompt = "Review the following git diff for correctness and readability:\n@diff";
+          };
+        };
+      };
+    };
+  };
+}