cli: add hexai command-line tool and split LSP to hexai-lsp

- New cmd/hexai CLI: reads stdin/arg, prints LLM output to stdout
- Prints provider/model immediately to stderr; summary at end
- Refactor config loader to internal/appconfig
- Update Taskfile to build/install/run both binaries
- Update README with new CLI and LSP names

1 files changed, 102 insertions, 0 deletions

diff --git a/internal/appconfig/config.go b/internal/appconfig/config.go
new file mode 100644
index 0000000..d12bdbe
--- /dev/null
+++ b/internal/appconfig/config.go
@@ -0,0 +1,102 @@
+package appconfig
+
+import (
+    "encoding/json"
+    "log"
+    "os"
+    "path/filepath"
+    "strings"
+)
+
+// App holds user-configurable settings read from ~/.config/hexai/config.json.
+type App struct {
+    MaxTokens          int      `json:"max_tokens"`
+    ContextMode        string   `json:"context_mode"`
+    ContextWindowLines int      `json:"context_window_lines"`
+    MaxContextTokens   int      `json:"max_context_tokens"`
+    LogPreviewLimit    int      `json:"log_preview_limit"`
+    NoDiskIO           bool     `json:"no_disk_io"`
+    TriggerCharacters  []string `json:"trigger_characters"`
+    Provider           string   `json:"provider"`
+    // Provider-specific options
+    OpenAIBaseURL  string `json:"openai_base_url"`
+    OpenAIModel    string `json:"openai_model"`
+    OllamaBaseURL  string `json:"ollama_base_url"`
+    OllamaModel    string `json:"ollama_model"`
+    CopilotBaseURL string `json:"copilot_base_url"`
+    CopilotModel   string `json:"copilot_model"`
+}
+
+// Load reads configuration from ~/.config/hexai/config.json and merges with defaults.
+func Load(logger *log.Logger) App {
+    cfg := App{
+        MaxTokens:          4000,
+        ContextMode:        "always-full",
+        ContextWindowLines: 120,
+        MaxContextTokens:   4000,
+        LogPreviewLimit:    100,
+        NoDiskIO:           true,
+    }
+    home, err := os.UserHomeDir()
+    if err != nil {
+        return cfg
+    }
+    path := filepath.Join(home, ".config", "hexai", "config.json")
+    f, err := os.Open(path)
+    if err != nil {
+        return cfg
+    }
+    defer f.Close()
+    dec := json.NewDecoder(f)
+    var fileCfg App
+    if err := dec.Decode(&fileCfg); err != nil {
+        if logger != nil {
+            logger.Printf("invalid config file %s: %v", path, err)
+        }
+        return cfg
+    }
+    // Merge: file overrides defaults when provided
+    if fileCfg.MaxTokens > 0 {
+        cfg.MaxTokens = fileCfg.MaxTokens
+    }
+    if strings.TrimSpace(fileCfg.ContextMode) != "" {
+        cfg.ContextMode = fileCfg.ContextMode
+    }
+    if fileCfg.ContextWindowLines > 0 {
+        cfg.ContextWindowLines = fileCfg.ContextWindowLines
+    }
+    if fileCfg.MaxContextTokens > 0 {
+        cfg.MaxContextTokens = fileCfg.MaxContextTokens
+    }
+    if fileCfg.LogPreviewLimit >= 0 {
+        cfg.LogPreviewLimit = fileCfg.LogPreviewLimit
+    }
+    cfg.NoDiskIO = fileCfg.NoDiskIO
+    if len(fileCfg.TriggerCharacters) > 0 {
+        cfg.TriggerCharacters = append([]string{}, fileCfg.TriggerCharacters...)
+    }
+    if strings.TrimSpace(fileCfg.Provider) != "" {
+        cfg.Provider = fileCfg.Provider
+    }
+    // Provider-specific options
+    if strings.TrimSpace(fileCfg.OpenAIBaseURL) != "" {
+        cfg.OpenAIBaseURL = fileCfg.OpenAIBaseURL
+    }
+    if strings.TrimSpace(fileCfg.OpenAIModel) != "" {
+        cfg.OpenAIModel = fileCfg.OpenAIModel
+    }
+    if strings.TrimSpace(fileCfg.OllamaBaseURL) != "" {
+        cfg.OllamaBaseURL = fileCfg.OllamaBaseURL
+    }
+    if strings.TrimSpace(fileCfg.OllamaModel) != "" {
+        cfg.OllamaModel = fileCfg.OllamaModel
+    }
+    if strings.TrimSpace(fileCfg.CopilotBaseURL) != "" {
+        cfg.CopilotBaseURL = fileCfg.CopilotBaseURL
+    }
+    if strings.TrimSpace(fileCfg.CopilotModel) != "" {
+        cfg.CopilotModel = fileCfg.CopilotModel
+    }
+    return cfg
+}
+