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| 1 | +// Package chat provides an AI chat interface using locally installed CLI agents. |
| 2 | +package chat |
| 3 | + |
| 4 | +import ( |
| 5 | + "bytes" |
| 6 | + "context" |
| 7 | + "fmt" |
| 8 | + "os" |
| 9 | + "os/exec" |
| 10 | + "strings" |
| 11 | +) |
| 12 | + |
| 13 | +// AgentType represents a supported AI agent. |
| 14 | +type AgentType string |
| 15 | + |
| 16 | +const ( |
| 17 | + AgentClaude AgentType = "claude" |
| 18 | + AgentCodex AgentType = "codex" |
| 19 | + AgentOllama AgentType = "ollama" |
| 20 | +) |
| 21 | + |
| 22 | +// Agent represents a detected AI agent on the system. |
| 23 | +type Agent struct { |
| 24 | + Type AgentType `json:"type"` |
| 25 | + Path string `json:"path"` |
| 26 | + Model string `json:"model,omitempty"` // for ollama: model name |
| 27 | + Version string `json:"version,omitempty"` // detected version |
| 28 | +} |
| 29 | + |
| 30 | +// DetectAgents scans the system for installed AI agents. |
| 31 | +// It checks for claude, codex, and ollama in $PATH. |
| 32 | +func DetectAgents() []Agent { |
| 33 | + agents := []Agent{} |
| 34 | + |
| 35 | + checks := []struct { |
| 36 | + name AgentType |
| 37 | + binary string |
| 38 | + versionArgs []string |
| 39 | + }{ |
| 40 | + {AgentClaude, "claude", []string{"--version"}}, |
| 41 | + {AgentCodex, "codex", []string{"--version"}}, |
| 42 | + {AgentOllama, "ollama", []string{"--version"}}, |
| 43 | + } |
| 44 | + |
| 45 | + for _, check := range checks { |
| 46 | + path, err := exec.LookPath(check.binary) |
| 47 | + if err != nil { |
| 48 | + continue |
| 49 | + } |
| 50 | + |
| 51 | + agent := Agent{ |
| 52 | + Type: check.name, |
| 53 | + Path: path, |
| 54 | + } |
| 55 | + |
| 56 | + // Try to get version |
| 57 | + if len(check.versionArgs) > 0 { |
| 58 | + out, err := exec.Command(path, check.versionArgs...).Output() |
| 59 | + if err == nil { |
| 60 | + agent.Version = strings.TrimSpace(string(out)) |
| 61 | + } |
| 62 | + } |
| 63 | + |
| 64 | + // Default model for ollama |
| 65 | + if check.name == AgentOllama { |
| 66 | + agent.Model = "mistral" |
| 67 | + } |
| 68 | + |
| 69 | + agents = append(agents, agent) |
| 70 | + } |
| 71 | + |
| 72 | + return agents |
| 73 | +} |
| 74 | + |
| 75 | +// FindAgent returns the first agent matching the given type, or nil. |
| 76 | +func FindAgent(agents []Agent, agentType AgentType) *Agent { |
| 77 | + for i := range agents { |
| 78 | + if agents[i].Type == agentType { |
| 79 | + return &agents[i] |
| 80 | + } |
| 81 | + } |
| 82 | + return nil |
| 83 | +} |
| 84 | + |
| 85 | +// Run executes the agent with the given prompt and returns the response. |
| 86 | +// Each agent type has a different invocation pattern: |
| 87 | +// - claude: claude -p --output-format text "prompt" |
| 88 | +// - codex: codex exec "prompt" |
| 89 | +// - ollama: echo "prompt" | ollama run <model> |
| 90 | +func (a *Agent) Run(ctx context.Context, prompt string) (string, error) { |
| 91 | + switch a.Type { |
| 92 | + case AgentClaude: |
| 93 | + return a.runClaude(ctx, prompt) |
| 94 | + case AgentCodex: |
| 95 | + return a.runCodex(ctx, prompt) |
| 96 | + case AgentOllama: |
| 97 | + return a.runOllama(ctx, prompt) |
| 98 | + default: |
| 99 | + return "", fmt.Errorf("unsupported agent type: %s", a.Type) |
| 100 | + } |
| 101 | +} |
| 102 | + |
| 103 | +// cleanEnv returns the current environment with nesting-detection vars removed |
| 104 | +// so agent subprocesses don't refuse to start inside our server process. |
| 105 | +func cleanEnv() []string { |
| 106 | + skip := map[string]bool{ |
| 107 | + "CLAUDECODE": true, |
| 108 | + "CLAUDE_CODE": true, |
| 109 | + "CODEX_SANDBOX": true, |
| 110 | + "CODEX_ENV": true, |
| 111 | + "INSIDE_CODEX": true, |
| 112 | + } |
| 113 | + |
| 114 | + var env []string |
| 115 | + for _, e := range os.Environ() { |
| 116 | + key, _, _ := strings.Cut(e, "=") |
| 117 | + if !skip[key] { |
| 118 | + env = append(env, e) |
| 119 | + } |
| 120 | + } |
| 121 | + return env |
| 122 | +} |
| 123 | + |
| 124 | +func (a *Agent) runClaude(ctx context.Context, prompt string) (string, error) { |
| 125 | + cmd := exec.CommandContext(ctx, a.Path, "-p", "--output-format", "text", prompt) |
| 126 | + cmd.Env = cleanEnv() |
| 127 | + var stdout, stderr bytes.Buffer |
| 128 | + cmd.Stdout = &stdout |
| 129 | + cmd.Stderr = &stderr |
| 130 | + |
| 131 | + if err := cmd.Run(); err != nil { |
| 132 | + return "", fmt.Errorf("claude error: %w: %s", err, stderr.String()) |
| 133 | + } |
| 134 | + |
| 135 | + return strings.TrimSpace(stdout.String()), nil |
| 136 | +} |
| 137 | + |
| 138 | +func (a *Agent) runCodex(ctx context.Context, prompt string) (string, error) { |
| 139 | + cmd := exec.CommandContext(ctx, a.Path, "exec", prompt) |
| 140 | + cmd.Env = cleanEnv() |
| 141 | + var stdout, stderr bytes.Buffer |
| 142 | + cmd.Stdout = &stdout |
| 143 | + cmd.Stderr = &stderr |
| 144 | + |
| 145 | + if err := cmd.Run(); err != nil { |
| 146 | + return "", fmt.Errorf("codex error: %w: %s", err, stderr.String()) |
| 147 | + } |
| 148 | + |
| 149 | + return strings.TrimSpace(stdout.String()), nil |
| 150 | +} |
| 151 | + |
| 152 | +func (a *Agent) runOllama(ctx context.Context, prompt string) (string, error) { |
| 153 | + model := a.Model |
| 154 | + if model == "" { |
| 155 | + model = "mistral" |
| 156 | + } |
| 157 | + |
| 158 | + cmd := exec.CommandContext(ctx, a.Path, "run", model) |
| 159 | + cmd.Env = cleanEnv() |
| 160 | + cmd.Stdin = strings.NewReader(prompt) |
| 161 | + var stdout, stderr bytes.Buffer |
| 162 | + cmd.Stdout = &stdout |
| 163 | + cmd.Stderr = &stderr |
| 164 | + |
| 165 | + if err := cmd.Run(); err != nil { |
| 166 | + return "", fmt.Errorf("ollama error: %w: %s", err, stderr.String()) |
| 167 | + } |
| 168 | + |
| 169 | + return strings.TrimSpace(stdout.String()), nil |
| 170 | +} |
| 171 | + |
| 172 | +// String returns a human-readable description of the agent. |
| 173 | +func (a *Agent) String() string { |
| 174 | + s := string(a.Type) |
| 175 | + if a.Model != "" { |
| 176 | + s += " (" + a.Model + ")" |
| 177 | + } |
| 178 | + if a.Version != "" { |
| 179 | + s += " " + a.Version |
| 180 | + } |
| 181 | + return s |
| 182 | +} |
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