feat: nix and guix shell

config.md

@@ -19,6 +19,8 @@ sudo = "run0"
 package_manager = "pacman"
 
 # preferred installation method, can be limited with the package manager
-# available options are: System, User, Temp
+# available options are:
+# - System
+# - Shell (nix and guix only)
 install_method = "System"
 ```

core/src/config.rs

@@ -1,8 +1,7 @@
 use serde::Deserialize;
 
 #[allow(dead_code)]
-#[derive(Deserialize)]
-#[derive(Default)]
+#[derive(Deserialize, Default)]
 pub struct Config {
 	pub sudo: Option<String>,
 	#[serde(default)]
@@ -12,16 +11,13 @@ pub struct Config {
 }
 
 #[allow(dead_code)]
-#[derive(Deserialize)]
-#[derive(Default)]
+#[derive(Deserialize, Default)]
 pub struct PackageManagerConfig {
 	pub package_manager: Option<String>,
 	#[serde(default)]
 	pub install_method: InstallMethod,
 }
 
-
-
 #[derive(Deserialize)]
 pub struct Timeout(pub u64);
 impl Default for Timeout {
@@ -30,13 +26,14 @@ impl Default for Timeout {
 	}
 }
 
-#[derive(Deserialize)]
-#[derive(Default)]
+#[derive(Deserialize, Default, PartialEq)]
 pub enum InstallMethod {
 	#[default]
 	System,
-	User,
-	Temp,
+	// !TODO: Implement other install methods
+	// User,
+	// Temp,
+	Shell,
 }
 
 pub fn load_config() -> Config {

core/src/modes.rs

@@ -9,9 +9,9 @@ use pay_respects_utils::files::best_match_file;
 use crate::data::Data;
 use crate::shell::shell_evaluated_commands;
 use crate::style::highlight_difference;
-use crate::suggestions;
 use crate::suggestions::suggest_candidates;
 use crate::system;
+use crate::{config, suggestions};
 
 pub fn suggestion(data: &mut Data) {
 	let mut last_command;
@@ -191,6 +191,17 @@ pub fn cnf(data: &mut Data) {
 			.prompt()
 			.unwrap_or_else(|_| std::process::exit(1));
 
+		let install_method = &data.config.package_manager.install_method;
+		if install_method == &config::InstallMethod::Shell {
+			// let the shell handle the installation and place the user in a shell
+			// environment with the package installed
+			println!(
+				"{}",
+				system::shell_package(data, &package_manager, &package)
+			);
+			return;
+		}
+
 		// retry after installing package
 		if system::install_package(data, &package_manager, &package) {
 			let status = suggestions::run_suggestion(data, &data.command);

core/src/system.rs

@@ -14,6 +14,13 @@ pub fn get_package_manager(data: &mut Data) -> Option<String> {
 		return Some(package_manager);
 	}
 
+	if let Some(package_manager) = data.config.package_manager.package_manager.as_ref() {
+		if package_manager.is_empty() {
+			return None;
+		}
+		return Some(package_manager.to_string());
+	}
+
 	if let Some(package_manager) = option_env!("_DEF_PR_PACKAGE_MANAGER") {
 		if package_manager.is_empty() {
 			return None;
@@ -245,3 +252,16 @@ pub fn install_package(data: &mut Data, package_manager: &str, package: &str) ->
 
 	result.success()
 }
+
+pub fn shell_package(data: &Data, package_manager: &str, package: &str) -> String {
+	let command = data.command.clone();
+
+	match package_manager {
+		"guix" => format!("guix shell {} -- {}", package, command),
+		"nix" => format!(
+			r#"nix shell nixpkgs#{} --command "{};return""#,
+			package, command
+		),
+		_ => unreachable!("Only `nix` and `guix` are supported for shell installation"),
+	}
+}