Plugins signature load (#349)

* saving signatures to file

* loading plugin signature from file

* is_plugin column for help command

Cargo.lock

@@ -948,6 +948,7 @@ dependencies = [
  "nu-path",
  "nu-plugin",
  "nu-protocol",
+ "serde_json",
  "thiserror",
 ]
 
@@ -978,6 +979,7 @@ dependencies = [
  "im",
  "miette",
  "serde",
+ "serde_json",
  "thiserror",
 ]
 

Cargo.toml

@@ -35,7 +35,7 @@ ctrlc = "3.2.1"
 # mimalloc = { version = "*", default-features = false }
 
 [features]
-plugin = ["nu-plugin", "nu-parser/plugin", "nu-command/plugin"]
+plugin = ["nu-plugin", "nu-parser/plugin", "nu-command/plugin", "nu-protocol/plugin"]
 default = ["plugin"]
 
 [dev-dependencies]

crates/nu-command/src/core_commands/help.rs

@@ -114,6 +114,12 @@ fn help(
                     span: head,
                 });
 
+                cols.push("is_plugin".into());
+                vals.push(Value::Bool {
+                    val: cmd.2,
+                    span: head,
+                });
+
                 cols.push("usage".into());
                 vals.push(Value::String { val: c, span: head });
 
@@ -157,6 +163,12 @@ fn help(
                     span: head,
                 });
 
+                cols.push("is_plugin".into());
+                vals.push(Value::Bool {
+                    val: cmd.2,
+                    span: head,
+                });
+
                 cols.push("usage".into());
                 vals.push(Value::String { val: c, span: head });
 

crates/nu-command/src/core_commands/register.rs

@@ -21,6 +21,7 @@ impl Command for Register {
                 SyntaxShape::Filepath,
                 "location of bin for plugin",
             )
+            .optional("signature", SyntaxShape::Any, "plugin signature")
             .category(Category::Core)
     }
 

crates/nu-command/src/default_context.rs

@@ -146,7 +146,7 @@ pub fn create_default_context() -> EngineState {
         working_set.render()
     };
 
-    engine_state.merge_delta(delta);
+    let _ = engine_state.merge_delta(delta);
 
     engine_state
 }

crates/nu-command/src/example_test.rs

@@ -33,7 +33,7 @@ pub fn test_examples(cmd: impl Command + 'static) {
         working_set.render()
     };
 
-    engine_state.merge_delta(delta);
+    let _ = engine_state.merge_delta(delta);
 
     for example in examples {
         // Skip tests that don't have results to compare to
@@ -53,7 +53,7 @@ pub fn test_examples(cmd: impl Command + 'static) {
             (output, working_set.render())
         };
 
-        engine_state.merge_delta(delta);
+        let _ = engine_state.merge_delta(delta);
 
         let mut stack = Stack::new();
 

crates/nu-engine/src/eval.rs

@@ -585,7 +585,7 @@ pub fn eval_variable(
 
                 cols.push("is_plugin".to_string());
                 vals.push(Value::Bool {
-                    val: decl.is_plugin(),
+                    val: decl.is_plugin().is_some(),
                     span,
                 });
 

crates/nu-parser/Cargo.toml

@@ -8,6 +8,7 @@ miette = "3.0.0"
 thiserror = "1.0.29"
 nu-protocol = { path = "../nu-protocol"}
 nu-plugin = { path = "../nu-plugin", optional=true}
+serde_json = "1.0"
 nu-path = {path = "../nu-path"}
 
 [features]

crates/nu-parser/src/errors.rs

@@ -192,6 +192,6 @@ pub enum ParseError {
     FileNotFound(String),
 
     #[error("Plugin error")]
-    #[diagnostic(code(nu::parser::export_not_found), url(docsrs))]
+    #[diagnostic(code(nu::parser::plugin_error), url(docsrs))]
     PluginError(String),
 }

crates/nu-parser/src/parse_keywords.rs

@@ -1085,6 +1085,8 @@ pub fn parse_plugin(
     working_set: &mut StateWorkingSet,
     spans: &[Span],
 ) -> (Statement, Option<ParseError>) {
+    use nu_protocol::Signature;
+
     let name = working_set.get_span_contents(spans[0]);
 
     if name != b"register" {
@@ -1122,7 +1124,8 @@ pub fn parse_plugin(
                                         // store declaration in working set
                                         let plugin_decl =
                                             PluginDeclaration::new(filename.clone(), signature);
-                                        working_set.add_decl(Box::new(plugin_decl));
+
+                                        working_set.add_plugin_decl(Box::new(plugin_decl));
                                     }
 
                                     None
@@ -1135,8 +1138,27 @@ pub fn parse_plugin(
                         Some(ParseError::NonUtf8(spans[1]))
                     }
                 }
+                3 => {
+                    let filename = working_set.get_span_contents(spans[1]);
+                    let signature = working_set.get_span_contents(spans[2]);
+
+                    if let Ok(filename) = String::from_utf8(filename.to_vec()) {
+                        if let Ok(signature) = serde_json::from_slice::<Signature>(signature) {
+                            let plugin_decl = PluginDeclaration::new(filename, signature);
+                            working_set.add_plugin_decl(Box::new(plugin_decl));
+
+                            None
+                        } else {
+                            Some(ParseError::PluginError(
+                                "unable to deserialize signature".into(),
+                            ))
+                        }
+                    } else {
+                        Some(ParseError::NonUtf8(spans[1]))
+                    }
+                }
                 _ => {
-                    let span = spans[2..].iter().fold(spans[2], |acc, next| Span {
+                    let span = spans[3..].iter().fold(spans[3], |acc, next| Span {
                         start: acc.start,
                         end: next.end,
                     });

crates/nu-plugin/src/plugin.rs

@@ -215,8 +215,8 @@ impl Command for PluginDeclaration {
         Ok(pipeline_data)
     }
 
-    fn is_plugin(&self) -> bool {
-        true
+    fn is_plugin(&self) -> Option<&str> {
+        Some(self.filename.as_str())
     }
 }
 

crates/nu-protocol/Cargo.toml

@@ -13,3 +13,10 @@ chrono = { version="0.4.19", features=["serde"] }
 chrono-humanize = "0.2.1"
 byte-unit = "4.0.9"
 im = "15.0.0"
+serde_json = { version = "1.0", optional = true }
+
+[features]
+plugin = ["serde_json"]
+
+[dev-dependencies]
+serde_json = "1.0"

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

@@ -47,8 +47,8 @@ pub trait Command: Send + Sync + CommandClone {
     }
 
     // Is a plugin command
-    fn is_plugin(&self) -> bool {
-        false
+    fn is_plugin(&self) -> Option<&str> {
+        None
     }
 
     // If command is a block i.e. def blah [] { }, get the block id

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

@@ -1,6 +1,7 @@
 use super::Command;
 use crate::{
-    ast::Block, BlockId, DeclId, Example, Overlay, OverlayId, Signature, Span, Type, VarId,
+    ast::Block, BlockId, DeclId, Example, Overlay, OverlayId, ShellError, Signature, Span, Type,
+    VarId,
 };
 use core::panic;
 use std::{
@@ -8,6 +9,8 @@ use std::{
     sync::{atomic::AtomicBool, Arc},
 };
 
+#[cfg(feature = "plugin")]
+use std::path::PathBuf;
 // Tells whether a decl etc. is visible or not
 #[derive(Debug, Clone)]
 struct Visibility {
@@ -136,6 +139,8 @@ pub struct EngineState {
     overlays: im::Vector<Overlay>,
     pub scope: im::Vector<ScopeFrame>,
     pub ctrlc: Option<Arc<AtomicBool>>,
+    #[cfg(feature = "plugin")]
+    pub plugin_signatures: Option<PathBuf>,
 }
 
 pub const NU_VARIABLE_ID: usize = 0;
@@ -154,6 +159,8 @@ impl EngineState {
             overlays: im::vector![],
             scope: im::vector![ScopeFrame::new()],
             ctrlc: None,
+            #[cfg(feature = "plugin")]
+            plugin_signatures: None,
         }
     }
 
@@ -164,7 +171,7 @@ impl EngineState {
     ///
     /// When we want to preserve what the parser has created, we can take its output (the `StateDelta`) and
     /// use this function to merge it into the global state.
-    pub fn merge_delta(&mut self, mut delta: StateDelta) {
+    pub fn merge_delta(&mut self, mut delta: StateDelta) -> Result<(), ShellError> {
         // Take the mutable reference and extend the permanent state from the working set
         self.files.extend(delta.files);
         self.file_contents.extend(delta.file_contents);
@@ -188,6 +195,53 @@ impl EngineState {
                 last.overlays.insert(item.0, item.1);
             }
             last.visibility.merge_with(first.visibility);
+
+            #[cfg(feature = "plugin")]
+            if !delta.plugin_decls.is_empty() {
+                for decl in delta.plugin_decls {
+                    let name = decl.name().as_bytes().to_vec();
+                    self.decls.push_back(decl);
+                    let decl_id = self.decls.len() - 1;
+
+                    last.decls.insert(name, decl_id);
+                    last.visibility.use_decl_id(&decl_id);
+                }
+
+                return self.update_plugin_file();
+            }
+        }
+
+        Ok(())
+    }
+
+    #[cfg(feature = "plugin")]
+    pub fn update_plugin_file(&self) -> Result<(), ShellError> {
+        use std::io::Write;
+
+        // Updating the signatures plugin file with the added signatures
+        if let Some(plugin_path) = &self.plugin_signatures {
+            // Always creating the file which will erase previous signatures
+            let mut plugin_file = std::fs::File::create(plugin_path.as_path())
+                .map_err(|err| ShellError::PluginError(err.to_string()))?;
+
+            // Plugin definitions with parsed signature
+            for decl in self.plugin_decls() {
+                // A successful plugin registration already includes the plugin filename
+                // No need to check the None option
+                let file_name = decl.is_plugin().expect("plugin should have file name");
+
+                let line = serde_json::to_string_pretty(&decl.signature())
+                    .map(|signature| format!("register {} {}\n", file_name, signature))
+                    .map_err(|err| ShellError::PluginError(err.to_string()))?;
+
+                plugin_file
+                    .write_all(line.as_bytes())
+                    .map_err(|err| ShellError::PluginError(err.to_string()))?;
+            }
+
+            Ok(())
+        } else {
+            Err(ShellError::PluginError("Plugin file not found".into()))
         }
     }
 
@@ -252,6 +306,10 @@ impl EngineState {
         None
     }
 
+    pub fn plugin_decls(&self) -> impl Iterator<Item = &Box<dyn Command + 'static>> {
+        self.decls.iter().filter(|decl| decl.is_plugin().is_some())
+    }
+
     pub fn find_overlay(&self, name: &[u8]) -> Option<OverlayId> {
         for scope in self.scope.iter().rev() {
             if let Some(overlay_id) = scope.overlays.get(name) {
@@ -314,7 +372,7 @@ impl EngineState {
         output
     }
 
-    pub fn get_signatures_with_examples(&self) -> Vec<(Signature, Vec<Example>)> {
+    pub fn get_signatures_with_examples(&self) -> Vec<(Signature, Vec<Example>, bool)> {
         let mut output = vec![];
         for decl in self.decls.iter() {
             if decl.get_block_id().is_none() {
@@ -322,7 +380,7 @@ impl EngineState {
                 signature.usage = decl.usage().to_string();
                 signature.extra_usage = decl.extra_usage().to_string();
 
-                output.push((signature, decl.examples()));
+                output.push((signature, decl.examples(), decl.is_plugin().is_some()));
             }
         }
 
@@ -418,6 +476,8 @@ pub struct StateDelta {
     pub(crate) file_contents: Vec<(Vec<u8>, usize, usize)>,
     vars: Vec<Type>,              // indexed by VarId
     decls: Vec<Box<dyn Command>>, // indexed by DeclId
+    #[cfg(feature = "plugin")]
+    plugin_decls: Vec<Box<dyn Command>>, // indexed by DeclId
     blocks: Vec<Block>,           // indexed by BlockId
     overlays: Vec<Overlay>,       // indexed by OverlayId
     pub scope: Vec<ScopeFrame>,
@@ -457,6 +517,8 @@ impl<'a> StateWorkingSet<'a> {
                 file_contents: vec![],
                 vars: vec![],
                 decls: vec![],
+                #[cfg(feature = "plugin")]
+                plugin_decls: vec![],
                 blocks: vec![],
                 overlays: vec![],
                 scope: vec![ScopeFrame::new()],
@@ -527,6 +589,11 @@ impl<'a> StateWorkingSet<'a> {
         scope_frame.predecls.insert(name, decl_id)
     }
 
+    #[cfg(feature = "plugin")]
+    pub fn add_plugin_decl(&mut self, decl: Box<dyn Command>) {
+        self.delta.plugin_decls.push(decl);
+    }
+
     pub fn merge_predecl(&mut self, name: &[u8]) -> Option<DeclId> {
         let scope_frame = self
             .delta

crates/nu-protocol/src/signature.rs

@@ -1,3 +1,6 @@
+use serde::Deserialize;
+use serde::Serialize;
+
 use crate::ast::Call;
 use crate::engine::Command;
 use crate::engine::EngineState;
@@ -7,7 +10,7 @@ use crate::PipelineData;
 use crate::SyntaxShape;
 use crate::VarId;
 
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub struct Flag {
     pub long: String,
     pub short: Option<char>,
@@ -18,7 +21,7 @@ pub struct Flag {
     pub var_id: Option<VarId>,
 }
 
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub struct PositionalArg {
     pub name: String,
     pub desc: String,
@@ -27,7 +30,7 @@ pub struct PositionalArg {
     pub var_id: Option<VarId>,
 }
 
-#[derive(Debug, Clone, PartialEq)]
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
 pub enum Category {
     Default,
     Conversions,
@@ -66,7 +69,7 @@ impl std::fmt::Display for Category {
     }
 }
 
-#[derive(Clone, Debug)]
+#[derive(Clone, Debug, Serialize, Deserialize)]
 pub struct Signature {
     pub name: String,
     pub usage: String,

crates/nu-protocol/src/syntax_shape.rs

@@ -1,7 +1,9 @@
+use serde::{Deserialize, Serialize};
+
 use crate::Type;
 
 /// The syntactic shapes that values must match to be passed into a command. You can think of this as the type-checking that occurs when you call a function.
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub enum SyntaxShape {
     /// A specific match to a word or symbol
     Keyword(Vec<u8>, Box<SyntaxShape>),

crates/nu-protocol/tests/test_signature.rs

@@ -120,3 +120,51 @@ fn test_signature_same_name() {
         )
         .named("name", SyntaxShape::String, "named description", Some('n'));
 }
+
+#[test]
+fn test_signature_round_trip() {
+    let signature = Signature::new("new_signature")
+        .desc("description")
+        .required("first", SyntaxShape::String, "first required")
+        .required("second", SyntaxShape::Int, "second required")
+        .optional("optional", SyntaxShape::String, "optional description")
+        .required_named(
+            "req_named",
+            SyntaxShape::String,
+            "required named description",
+            Some('r'),
+        )
+        .named("named", SyntaxShape::String, "named description", Some('n'))
+        .switch("switch", "switch description", None)
+        .rest("rest", SyntaxShape::String, "rest description")
+        .category(nu_protocol::Category::Conversions);
+
+    let string = serde_json::to_string_pretty(&signature).unwrap();
+    let returned: Signature = serde_json::from_str(&string).unwrap();
+
+    assert_eq!(signature.name, returned.name);
+    assert_eq!(signature.usage, returned.usage);
+    assert_eq!(signature.extra_usage, returned.extra_usage);
+    assert_eq!(signature.is_filter, returned.is_filter);
+    assert_eq!(signature.category, returned.category);
+
+    signature
+        .required_positional
+        .iter()
+        .zip(returned.required_positional.iter())
+        .for_each(|(lhs, rhs)| assert_eq!(lhs, rhs));
+
+    signature
+        .optional_positional
+        .iter()
+        .zip(returned.optional_positional.iter())
+        .for_each(|(lhs, rhs)| assert_eq!(lhs, rhs));
+
+    signature
+        .named
+        .iter()
+        .zip(returned.named.iter())
+        .for_each(|(lhs, rhs)| assert_eq!(lhs, rhs));
+
+    assert_eq!(signature.rest_positional, returned.rest_positional,);
+}

src/main.rs

@@ -118,7 +118,10 @@ fn main() -> Result<()> {
             (output, working_set.render())
         };
 
-        engine_state.merge_delta(delta);
+        if let Err(err) = engine_state.merge_delta(delta) {
+            let working_set = StateWorkingSet::new(&engine_state);
+            report_error(&working_set, &err);
+        }
 
         let mut stack = nu_protocol::engine::Stack::new();
 
@@ -185,10 +188,9 @@ fn main() -> Result<()> {
             config_path.push("nushell");
             config_path.push("config.nu");
 
+            if config_path.exists() {
                 // FIXME: remove this message when we're ready
                 println!("Loading config from: {:?}", config_path);
-
-            if config_path.exists() {
                 let config_filename = config_path.to_string_lossy().to_owned();
 
                 if let Ok(contents) = std::fs::read_to_string(&config_path) {
@@ -206,6 +208,24 @@ fn main() -> Result<()> {
             None
         };
 
+        #[cfg(feature = "plugin")]
+        {
+            // Reading signatures from signature file
+            // The plugin.nu file stores the parsed signature collected from each registered plugin
+            if let Some(mut plugin_path) = nu_path::config_dir() {
+                // Path to store plugins signatures
+                plugin_path.push("nushell");
+                plugin_path.push("plugin.nu");
+                engine_state.plugin_signatures = Some(plugin_path.clone());
+
+                let plugin_filename = plugin_path.to_string_lossy().to_owned();
+
+                if let Ok(contents) = std::fs::read_to_string(&plugin_path) {
+                    eval_source(&mut engine_state, &mut stack, &contents, &plugin_filename);
+                }
+            }
+        }
+
         loop {
             //Reset the ctrl-c handler
             ctrlc.store(false, Ordering::SeqCst);
@@ -387,7 +407,10 @@ fn eval_source(
         (output, working_set.render())
     };
 
-    engine_state.merge_delta(delta);
+    if let Err(err) = engine_state.merge_delta(delta) {
+        let working_set = StateWorkingSet::new(engine_state);
+        report_error(&working_set, &err);
+    }
 
     match eval_block(
         engine_state,