feat(opencode): add installer for AI coding assistant

opencode/README.md

@@ -0,0 +1,120 @@
+---
+title: opencode
+homepage: https://github.com/anomalyco/opencode
+tagline: |
+  opencode: A terminal-based AI coding agent with multi-provider LLM support.
+---
+
+To update or switch versions, run `webi opencode@stable` (or `@v1.2`, `@beta`,
+etc).
+
+### Files
+
+These are the files / directories that are created and/or modified with this
+install:
+
+```text
+~/.config/envman/PATH.env
+~/.local/bin/opencode
+~/.local/opt/opencode-VERSION/bin/opencode
+~/.config/opencode/opencode.json
+```
+
+## Cheat Sheet
+
+> `opencode` is an AI coding agent that runs in the terminal. It connects to LLM
+> providers (Anthropic, OpenAI, Google, or local models via Ollama) and gives
+> you an interactive TUI with full tool use — file editing, shell commands, and
+> codebase navigation.
+
+### How to Get Started
+
+Set an API key and launch in your project directory:
+
+```sh
+export ANTHROPIC_API_KEY="sk-ant-..."
+cd ~/your-project
+opencode
+```
+
+opencode starts a TUI where you can chat, edit files, run commands, and navigate
+your codebase.
+
+### How to Configure Providers
+
+Add providers to `~/.config/opencode/opencode.json`:
+
+```json
+{
+  "$schema": "https://opencode.ai/config.json",
+  "provider": {
+    "anthropic": {},
+    "openai": {}
+  },
+  "model": {
+    "big": "anthropic/claude-sonnet-4-5-20250514",
+    "small": "anthropic/claude-haiku-4-5-20250514"
+  }
+}
+```
+
+Anthropic reads `ANTHROPIC_API_KEY`, OpenAI reads `OPENAI_API_KEY`.
+
+### How to Use Plugins
+
+opencode supports plugins for extended workflows.
+[oh-my-opencode](https://github.com/code-yeongyu/oh-my-opencode) adds
+multi-agent orchestration, model routing, and specialized skills — the entire
+plugin system fits in a single config line:
+
+```json
+{
+  "$schema": "https://opencode.ai/config.json",
+  "plugin": ["oh-my-opencode@latest"],
+  "provider": {
+    "anthropic": {}
+  }
+}
+```
+
+That's it. One plugin, your providers, done. The plugin handles agent
+definitions, skill loading, and model routing automatically.
+
+### How to Use with Local Models
+
+Install [ollama](../ollama/) (also available via webi), then configure opencode:
+
+```sh
+webi ollama
+ollama serve &
+ollama pull qwen2.5-coder:14b
+```
+
+```json
+{
+  "$schema": "https://opencode.ai/config.json",
+  "provider": {
+    "ollama": {
+      "npm": "@ai-sdk/openai-compatible",
+      "options": {
+        "baseURL": "http://127.0.0.1:11434/v1"
+      },
+      "models": {
+        "qwen2.5-coder:14b": {
+          "name": "Qwen 2.5 Coder 14B (local)"
+        }
+      }
+    }
+  }
+}
+```
+
+### Useful Key Bindings
+
+| Key      | Action                           |
+| -------- | -------------------------------- |
+| `Enter`  | Send message                     |
+| `Ctrl+E` | Open editor for multi-line input |
+| `Ctrl+C` | Cancel current operation         |
+| `Ctrl+L` | Clear screen                     |
+| `/`      | Slash commands                   |

opencode/SKILL.md

@@ -0,0 +1,124 @@
+---
+name: opencode
+description:
+  Terminal-based AI coding agent with multi-provider LLM support, file editing,
+  shell access, and plugin system. Use when the user wants AI pair programming
+  in the terminal.
+homepage: https://github.com/anomalyco/opencode
+---
+
+# OpenCode
+
+Terminal-based AI coding agent that connects to multiple LLM providers
+(Anthropic, OpenAI, Google, local Ollama) with an interactive TUI for writing,
+reviewing, and refactoring code.
+
+## When to Use
+
+- User wants AI pair programming directly in the terminal
+- User needs full tool use (file editing, shell commands, grep, read)
+- User wants plugin-based multi-agent orchestration (oh-my-opencode)
+- User wants local-first AI coding with Ollama (no API costs)
+
+## Installation
+
+```sh
+curl https://webi.sh/opencode | sh
+source ~/.config/envman/PATH.env
+```
+
+## Quick Start
+
+1. **Set API key**:
+
+   ```sh
+   export ANTHROPIC_API_KEY="sk-ant-..."
+   ```
+
+2. **Launch in project directory**:
+
+   ```sh
+   cd ~/your-project
+   opencode
+   ```
+
+## Configuration
+
+Edit `~/.config/opencode/opencode.json`:
+
+```json
+{
+  "$schema": "https://opencode.ai/config.json",
+  "provider": {
+    "anthropic": {},
+    "openai": {}
+  },
+  "model": {
+    "big": "anthropic/claude-sonnet-4-5-20250514",
+    "small": "anthropic/claude-haiku-4-5-20250514"
+  }
+}
+```
+
+### With oh-my-opencode Plugin
+
+```json
+{
+  "$schema": "https://opencode.ai/config.json",
+  "plugin": ["oh-my-opencode@latest"],
+  "provider": {
+    "anthropic": {}
+  }
+}
+```
+
+### Local Models with Ollama
+
+```sh
+webi ollama
+ollama serve &
+ollama pull qwen2.5-coder:14b
+```
+
+```json
+{
+  "$schema": "https://opencode.ai/config.json",
+  "provider": {
+    "ollama": {
+      "npm": "@ai-sdk/openai-compatible",
+      "options": {
+        "baseURL": "http://127.0.0.1:11434/v1"
+      },
+      "models": {
+        "qwen2.5-coder:14b": {
+          "name": "Qwen 2.5 Coder 14B (local)"
+        }
+      }
+    }
+  }
+}
+```
+
+## Key Bindings
+
+| Key      | Action                           |
+| -------- | -------------------------------- |
+| `Enter`  | Send message                     |
+| `Ctrl+E` | Open editor for multi-line input |
+| `Ctrl+C` | Cancel current operation         |
+| `Ctrl+L` | Clear screen                     |
+| `/`      | Slash commands                   |
+
+## Files Created
+
+```text
+~/.config/envman/PATH.env
+~/.local/bin/opencode
+~/.local/opt/opencode-VERSION/bin/opencode
+~/.config/opencode/opencode.json
+```
+
+## Related Webi Installers
+
+- `ollama` — Local LLM server for offline AI coding
+- `node` — Required for installing plugins (oh-my-opencode)

opencode/install.ps1

@@ -0,0 +1,53 @@
+#!/usr/bin/env pwsh
+
+####################
+# Install opencode #
+####################
+
+# Every package should define these variables
+$pkg_cmd_name = "opencode"
+
+$pkg_dst_cmd = "$Env:USERPROFILE\.local\bin\opencode.exe"
+$pkg_dst = "$pkg_dst_cmd"
+
+$pkg_src_cmd = "$Env:USERPROFILE\.local\opt\opencode-v$Env:WEBI_VERSION\bin\opencode.exe"
+$pkg_src_bin = "$Env:USERPROFILE\.local\opt\opencode-v$Env:WEBI_VERSION\bin"
+$pkg_src_dir = "$Env:USERPROFILE\.local\opt\opencode-v$Env:WEBI_VERSION"
+$pkg_src = "$pkg_src_cmd"
+
+New-Item "$Env:USERPROFILE\Downloads\webi" -ItemType Directory -Force | Out-Null
+$pkg_download = "$Env:USERPROFILE\Downloads\webi\$Env:WEBI_PKG_FILE"
+
+# Fetch archive
+if (!(Test-Path -Path "$Env:USERPROFILE\Downloads\webi\$Env:WEBI_PKG_FILE")) {
+    Write-Output "Downloading opencode from $Env:WEBI_PKG_URL to $pkg_download"
+    & curl.exe -A "$Env:WEBI_UA" -fsSL "$Env:WEBI_PKG_URL" -o "$pkg_download.part"
+    & Move-Item "$pkg_download.part" "$pkg_download"
+}
+
+if (!(Test-Path -Path "$pkg_src_cmd")) {
+    Write-Output "Installing opencode"
+
+    # Enter tmp
+    Push-Location .local\tmp
+
+    # Remove any leftover tmp cruft
+    Remove-Item -Path ".\opencode-v*" -Recurse -ErrorAction Ignore
+    Remove-Item -Path ".\opencode.exe" -Recurse -ErrorAction Ignore
+
+    # Unpack archive
+    Write-Output "Unpacking $pkg_download"
+    & tar xf "$pkg_download"
+
+    # Move single binary into place
+    Write-Output "Install Location: $pkg_src_cmd"
+    New-Item "$pkg_src_bin" -ItemType Directory -Force | Out-Null
+    Move-Item -Path ".\opencode.exe" -Destination "$pkg_src_bin"
+
+    # Exit tmp
+    Pop-Location
+}
+
+Write-Output "Copying into '$pkg_dst_cmd' from '$pkg_src_cmd'"
+Remove-Item -Path "$pkg_dst_cmd" -Recurse -ErrorAction Ignore | Out-Null
+Copy-Item -Path "$pkg_src" -Destination "$pkg_dst" -Recurse

opencode/install.sh

@@ -0,0 +1,40 @@
+#!/bin/sh
+# shellcheck disable=SC2034
+
+set -e
+set -u
+
+__init_opencode() {
+
+    ####################
+    # Install opencode #
+    ####################
+
+    pkg_cmd_name="opencode"
+
+    pkg_dst_cmd="$HOME/.local/bin/opencode"
+    pkg_dst="$pkg_dst_cmd"
+
+    pkg_src_cmd="$HOME/.local/opt/opencode-v$WEBI_VERSION/bin/opencode"
+    pkg_src_dir="$HOME/.local/opt/opencode-v$WEBI_VERSION"
+    pkg_src="$pkg_src_cmd"
+
+    pkg_install() {
+        # ~/.local/opt/opencode-v1.2.27/bin/
+        mkdir -p "$(dirname "$pkg_src_cmd")"
+
+        # mv ./opencode ~/.local/opt/opencode-v1.2.27/bin/opencode
+        mv ./opencode "$pkg_src_cmd"
+        chmod a+x "$pkg_src_cmd"
+    }
+
+    pkg_get_current_version() {
+        # 'opencode --version' outputs just the version number:
+        #       1.2.27
+        opencode --version 2> /dev/null |
+            head -n 1
+    }
+
+}
+
+__init_opencode

opencode/releases.js

@@ -0,0 +1,44 @@
+'use strict';
+
+var github = require('../_common/github.js');
+var owner = 'anomalyco';
+var repo = 'opencode';
+
+let Releases = module.exports;
+
+Releases.latest = async function () {
+  let all = await github(null, owner, repo);
+
+  // Keep only CLI binaries: opencode-{os}-{arch}.{tar.gz|zip}
+  // Exclude: desktop/electron apps, baseline builds, .yml/.yaml manifests,
+  //          .json metadata, .dmg/.deb/.rpm packages, .sig signatures
+  // Exclude musl builds: the normalizer maps both musl and gnu to the same
+  // os/arch key, causing duplicates. Prefer gnu (glibc) as the default.
+  all.releases = all.releases.filter(function (rel) {
+    let name = rel.name;
+    return (
+      name.match(/^opencode-(darwin|linux|windows)-/) &&
+      !name.includes('desktop') &&
+      !name.includes('baseline') &&
+      !name.includes('-musl') &&
+      (name.endsWith('.tar.gz') || name.endsWith('.zip'))
+    );
+  });
+
+  return all;
+};
+
+Releases.sample = async function () {
+  let normalize = require('../_webi/normalize.js');
+  let all = await Releases.latest();
+  all = normalize(all);
+  all.releases = all.releases.slice(0, 10);
+  return all;
+};
+
+if (module === require.main) {
+  (async function () {
+    let samples = await Releases.sample();
+    console.info(JSON.stringify(samples, null, 2));
+  })();
+}