feat: v0.7.0 — registre de providers LLM : am providers list/show/add/remove/default, settings.providers + default_provider (closes #88)

src/commands/config_cmd.rs

@@ -114,14 +114,21 @@ pub fn set_value(app: &App, key: &str, value: &str) -> Result<i32> {
 /// exists. Used by the REPL 'theme <name>' command so a switched theme
 /// survives a restart.
 pub fn persist_setting(app: &App, key: &str, value: &str) -> Result<()> {
-    let path = match &app.config_origin {
-        Some(p) => p.clone(),
-        None => user_config_path(app)?,
-    };
+    let path = active_config_path(app)?;
     write_dotted_key(&path, key, value)?;
     reload_and_validate(&path)
 }
 
+/// Path of the configuration file that is actually in effect: the loaded
+/// origin when one exists, otherwise the user config file (created on
+/// demand). Mutating commands write here so the change survives a reload.
+pub(crate) fn active_config_path(app: &App) -> Result<PathBuf> {
+    match &app.config_origin {
+        Some(p) => Ok(p.clone()),
+        None => user_config_path(app),
+    }
+}
+
 /// Set one dotted key (e.g. settings.default_shell) in a YAML config file.
 fn write_dotted_key(path: &Path, key: &str, value: &str) -> Result<()> {
     let text = std::fs::read_to_string(path)
@@ -155,7 +162,7 @@ fn write_dotted_key(path: &Path, key: &str, value: &str) -> Result<()> {
 }
 
 /// Reload a written config file to make sure the change stays valid.
-fn reload_and_validate(path: &Path) -> Result<()> {
+pub(crate) fn reload_and_validate(path: &Path) -> Result<()> {
     let cli = crate::cli::Cli::parse_from(["am", "--config", path.to_str().unwrap_or_default()]);
     config::load(&cli).map_err(|e| {
         anyhow!("the new value makes the configuration invalid: {e:#}")
@@ -183,7 +190,7 @@ fn user_config_path_if_any(app: &App) -> Option<PathBuf> {
 }
 
 /// Ensure the user config file exists (creating a template when needed).
-fn user_config_path(app: &App) -> Result<PathBuf> {
+pub(crate) fn user_config_path(app: &App) -> Result<PathBuf> {
     let dir = app
         .paths
         .config_dir