feat: #18 ✨ Add support to enter a shell using the nur initialised state

src/engine.rs

@@ -1,14 +1,15 @@
 use crate::args::{is_safe_taskname, parse_commandline_args, NurArgs};
+use crate::errors::NurError::EnteredShellError;
 use crate::errors::{NurError, NurResult};
 use crate::names::{
     NUR_ENV_NUR_TASK_CALL, NUR_ENV_NUR_TASK_NAME, NUR_ENV_NUR_VERSION, NUR_ENV_NU_LIB_DIRS,
     NUR_NAME, NUR_VAR_CONFIG_DIR, NUR_VAR_DEFAULT_LIB_DIR, NUR_VAR_PROJECT_PATH, NUR_VAR_RUN_PATH,
-    NUR_VAR_TASK_NAME,
+    NUR_VAR_TASK_NAME, NUSHELL_FOLDER,
 };
 use crate::nu_version::NU_VERSION;
 use crate::scripts::{get_default_nur_config, get_default_nur_env};
 use crate::state::NurState;
-use nu_cli::gather_parent_env_vars;
+use nu_cli::{evaluate_repl, gather_parent_env_vars};
 use nu_engine::get_full_help;
 use nu_protocol::ast::Block;
 use nu_protocol::engine::{Command, Stack, StateWorkingSet};
@@ -420,6 +421,20 @@ impl NurEngine {
 
         let _ = std::panic::catch_unwind(move || stdout_write_all_and_flush(full_help));
     }
+
+    pub(crate) fn run_repl(&mut self) -> NurResult<()> {
+        match evaluate_repl(
+            &mut self.engine_state,
+            self.stack.clone(),
+            NUSHELL_FOLDER,
+            None,
+            None,
+            std::time::Instant::now(),
+        ) {
+            Ok(_) => Ok(()),
+            Err(_) => Err(EnteredShellError()),
+        }
+    }
 }
 
 #[cfg(test)]

src/errors.rs

@@ -33,6 +33,10 @@ pub enum NurError {
     #[error("Could not find nurfile in path and parents")]
     #[diagnostic()]
     NurfileNotFound(),
+
+    #[error("Entered shell did raise an error")]
+    #[diagnostic()]
+    EnteredShellError(),
 }
 
 impl From<std::io::Error> for NurError {

src/main.rs

@@ -168,7 +168,12 @@ fn main() -> Result<ExitCode, miette::ErrReport> {
     if parsed_nur_args.debug_output {
         eprintln!("full command call: {}", run_command);
     }
-    if parsed_nur_args.quiet_execution {
+    if parsed_nur_args.enter_shell {
+        exit_code = match nur_engine.run_repl() {
+            Ok(_) => 0,
+            Err(_) => 1,
+        }
+    } else if parsed_nur_args.quiet_execution {
         exit_code = nur_engine.eval_and_print(run_command, input)?;
 
         #[cfg(feature = "debug")]

src/names.rs

@@ -22,3 +22,6 @@ pub(crate) const NUR_VAR_DEFAULT_LIB_DIR: &str = "default-lib-dir";
 // nurfile names
 pub(crate) const NUR_FILE: &str = "nurfile";
 pub(crate) const NUR_LOCAL_FILE: &str = "nurfile.local";
+
+// nu shell consts
+pub(crate) const NUSHELL_FOLDER: &str = "nushell"; // nu-cli -> config_files.rs