Port help and start porting split

crates/nu-protocol/src/engine/engine_state.rs

@@ -1,5 +1,5 @@
 use super::Command;
-use crate::{ast::Block, BlockId, DeclId, Signature, Span, Type, VarId};
+use crate::{ast::Block, BlockId, DeclId, Example, Signature, Span, Type, VarId};
 use core::panic;
 use std::{
     collections::{HashMap, HashSet},
@@ -178,7 +178,7 @@ impl EngineState {
             .expect("internal error: missing declaration")
     }
 
-    pub fn get_decls(&self) -> Vec<Signature> {
+    pub fn get_signatures(&self) -> Vec<Signature> {
         let mut output = vec![];
         for decl in self.decls.iter() {
             if decl.get_block_id().is_none() {
@@ -193,6 +193,21 @@ impl EngineState {
         output
     }
 
+    pub fn get_signatures_with_examples(&self) -> Vec<(Signature, Vec<Example>)> {
+        let mut output = vec![];
+        for decl in self.decls.iter() {
+            if decl.get_block_id().is_none() {
+                let mut signature = (*decl).signature();
+                signature.usage = decl.usage().to_string();
+                signature.extra_usage = decl.extra_usage().to_string();
+
+                output.push((signature, decl.examples()));
+            }
+        }
+
+        output
+    }
+
     pub fn get_block(&self, block_id: BlockId) -> &Block {
         self.blocks
             .get(block_id)

crates/nu-protocol/src/engine/evaluation_context.rs

@@ -1,7 +1,7 @@
 use super::EngineState;
 use std::{cell::RefCell, collections::HashMap, rc::Rc};
 
-use crate::{ShellError, Signature, Value, VarId};
+use crate::{Example, ShellError, Signature, Value, VarId};
 
 #[derive(Clone)]
 pub struct EvaluationContext {
@@ -47,8 +47,12 @@ impl EvaluationContext {
         self.stack.print_stack();
     }
 
-    pub fn get_commands_info(&self) -> Vec<Signature> {
-        self.engine_state.borrow().get_decls()
+    pub fn get_signatures(&self) -> Vec<Signature> {
+        self.engine_state.borrow().get_signatures()
+    }
+
+    pub fn get_signatures_with_examples(&self) -> Vec<(Signature, Vec<Example>)> {
+        self.engine_state.borrow().get_signatures_with_examples()
     }
 }
 

crates/nu-protocol/src/shell_error.rs

@@ -19,6 +19,16 @@ pub enum ShellError {
         rhs_span: Span,
     },
 
+    #[error("Pipeline mismatch.")]
+    #[diagnostic(code(nu::shell::pipeline_mismatch), url(docsrs))]
+    PipelineMismatch {
+        expected: Type,
+        #[label("expected: {expected}")]
+        expected_span: Span,
+        #[label("value originates from here")]
+        origin: Span,
+    },
+
     #[error("Unsupported operator: {0}.")]
     #[diagnostic(code(nu::shell::unsupported_operator), url(docsrs))]
     UnsupportedOperator(Operator, #[label = "unsupported operator"] Span),
@@ -79,6 +89,10 @@ pub enum ShellError {
     #[diagnostic(code(nu::shell::unsupported_input), url(docsrs))]
     UnsupportedInput(String, #[label("{0}")] Span),
 
+    #[error("Command not found")]
+    #[diagnostic(code(nu::shell::command_not_found), url(docsrs))]
+    CommandNotFound(#[label("command not found")] Span),
+
     #[error("Flag not found")]
     #[diagnostic(code(nu::shell::flag_not_found), url(docsrs))]
     FlagNotFound(String, #[label("{0} not found")] Span),