feat: extra arguments for Home Manager (#507)

* feat: extra arguments for Home Manager

config.example.toml

@@ -57,6 +57,9 @@
 # Whether to self update (this is ignored if the binary has been built without self update support, available also via setting the environment variable TOPGRADE_NO_SELF_UPGRADE)
 #no_self_update = true
 
+# Extra Home Manager arguments
+#home_manager_arguments = ["--flake", "file"]
+
 # Commands to run before anything
 [pre_commands]
 #"Emacs Snapshot" = "rm -rf ~/.emacs.d/elpa.bak && cp -rl ~/.emacs.d/elpa ~/.emacs.d/elpa.bak"

src/config.rs

@@ -351,6 +351,9 @@ pub struct Linux {
 
     #[merge(strategy = crate::utils::merge_strategies::string_append_opt)]
     emerge_update_flags: Option<String>,
+
+    #[merge(strategy = crate::utils::merge_strategies::vec_prepend_opt)]
+    home_manager_arguments: Option<Vec<String>>,
 }
 
 #[derive(Deserialize, Default, Debug, Merge)]
@@ -1275,6 +1278,14 @@ impl Config {
             .and_then(|linux| linux.nix_arguments.as_deref())
     }
 
+    /// Extra Home Manager arguments
+    pub fn home_manager(&self) -> Option<&Vec<String>> {
+        self.config_file
+            .linux
+            .as_ref()
+            .and_then(|misc| misc.home_manager_arguments.as_ref())
+    }
+
     /// Distrobox use root
     pub fn distrobox_root(&self) -> bool {
         self.config_file

src/steps/os/unix.rs

@@ -442,7 +442,15 @@ pub fn run_home_manager(ctx: &ExecutionContext) -> Result<()> {
     let home_manager = require("home-manager")?;
 
     print_separator("home-manager");
-    ctx.run_type().execute(home_manager).arg("switch").status_checked()
+
+    let mut cmd = ctx.run_type().execute(home_manager);
+    cmd.arg("switch");
+
+    if let Some(extra_args) = ctx.config().home_manager() {
+        cmd.args(extra_args);
+    }
+
+    cmd.status_checked()
 }
 
 pub fn run_tldr(ctx: &ExecutionContext) -> Result<()> {