2 files changed, 104 insertions, 100 deletions

diff --git a/crates/ra_ide_api/src/display.rs b/crates/ra_ide_api/src/display.rs
index e29ae3371..f1717b008 100644
--- a/crates/ra_ide_api/src/display.rs
+++ b/crates/ra_ide_api/src/display.rs
@@ -1,18 +1,15 @@
 //! This module contains utilities for turning SyntaxNodes and HIR types
 //! into things that may be used to render in a UI.
 
+mod function_signature;
 mod navigation_target;
 mod structure;
 
-use super::*;
-use std::fmt::{self, Display};
-use join_to_string::join;
-use ra_syntax::{ast::{self, AstNode, NameOwner, VisibilityOwner, TypeParamsOwner}, SyntaxKind::{ATTR, COMMENT}};
-use std::convert::From;
-use hir::Docs;
+use ra_syntax::{ast::{self, AstNode, TypeParamsOwner}, SyntaxKind::{ATTR, COMMENT}};
 
 pub use navigation_target::NavigationTarget;
 pub use structure::{StructureNode, file_structure};
+pub use function_signature::FunctionSignature;
 
 pub(crate) fn function_label(node: &ast::FnDef) -> String {
     FunctionSignature::from(node).to_string()
@@ -40,100 +37,6 @@ pub(crate) fn type_label(node: &ast::TypeAliasDef) -> String {
     label.trim().to_owned()
 }
 
-/// Contains information about a function signature
-#[derive(Debug)]
-pub struct FunctionSignature {
-    /// Optional visibility
-    pub visibility: Option<String>,
-    /// Name of the function
-    pub name: Option<String>,
-    /// Documentation for the function
-    pub doc: Option<Documentation>,
-    /// Generic parameters
-    pub generic_parameters: Vec<String>,
-    /// Parameters of the function
-    pub parameters: Vec<String>,
-    /// Optional return type
-    pub ret_type: Option<String>,
-    /// Where predicates
-    pub where_predicates: Vec<String>,
-}
-
-impl FunctionSignature {
-    pub(crate) fn with_doc_opt(mut self, doc: Option<Documentation>) -> Self {
-        self.doc = doc;
-        self
-    }
-
-    pub(crate) fn from_hir(db: &db::RootDatabase, function: hir::Function) -> Self {
-        let doc = function.docs(db);
-        let (_, ast_node) = function.source(db);
-        FunctionSignature::from(&*ast_node).with_doc_opt(doc)
-    }
-}
-
-impl From<&'_ ast::FnDef> for FunctionSignature {
-    fn from(node: &ast::FnDef) -> FunctionSignature {
-        fn param_list(node: &ast::FnDef) -> Vec<String> {
-            let mut res = vec![];
-            if let Some(param_list) = node.param_list() {
-                if let Some(self_param) = param_list.self_param() {
-                    res.push(self_param.syntax().text().to_string())
-                }
-
-                res.extend(param_list.params().map(|param| param.syntax().text().to_string()));
-            }
-            res
-        }
-
-        FunctionSignature {
-            visibility: node.visibility().map(|n| n.syntax().text().to_string()),
-            name: node.name().map(|n| n.text().to_string()),
-            ret_type: node
-                .ret_type()
-                .and_then(|r| r.type_ref())
-                .map(|n| n.syntax().text().to_string()),
-            parameters: param_list(node),
-            generic_parameters: generic_parameters(node),
-            where_predicates: where_predicates(node),
-            // docs are processed separately
-            doc: None,
-        }
-    }
-}
-
-impl Display for FunctionSignature {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        if let Some(t) = &self.visibility {
-            write!(f, "{} ", t)?;
-        }
-
-        if let Some(name) = &self.name {
-            write!(f, "fn {}", name)?;
-        }
-
-        if !self.generic_parameters.is_empty() {
-            join(self.generic_parameters.iter())
-                .separator(", ")
-                .surround_with("<", ">")
-                .to_fmt(f)?;
-        }
-
-        join(self.parameters.iter()).separator(", ").surround_with("(", ")").to_fmt(f)?;
-
-        if let Some(t) = &self.ret_type {
-            write!(f, " -> {}", t)?;
-        }
-
-        if !self.where_predicates.is_empty() {
-            write!(f, "\nwhere ")?;
-            join(self.where_predicates.iter()).separator(",\n      ").to_fmt(f)?;
-        }
-
-        Ok(())
-    }
-}
-
 pub(crate) fn generic_parameters<N: TypeParamsOwner>(node: &N) -> Vec<String> {
     let mut res = vec![];
     if let Some(type_params) = node.type_param_list() {
diff --git a/crates/ra_ide_api/src/display/function_signature.rs b/crates/ra_ide_api/src/display/function_signature.rs
new file mode 100644
index 000000000..d09950bce
--- /dev/null
+++ b/crates/ra_ide_api/src/display/function_signature.rs
@@ -0,0 +1,101 @@
+use super::{where_predicates, generic_parameters};
+use crate::db;
+use std::fmt::{self, Display};
+use join_to_string::join;
+use ra_syntax::ast::{self, AstNode, NameOwner, VisibilityOwner};
+use std::convert::From;
+use hir::{Docs, Documentation};
+
+/// Contains information about a function signature
+#[derive(Debug)]
+pub struct FunctionSignature {
+    /// Optional visibility
+    pub visibility: Option<String>,
+    /// Name of the function
+    pub name: Option<String>,
+    /// Documentation for the function
+    pub doc: Option<Documentation>,
+    /// Generic parameters
+    pub generic_parameters: Vec<String>,
+    /// Parameters of the function
+    pub parameters: Vec<String>,
+    /// Optional return type
+    pub ret_type: Option<String>,
+    /// Where predicates
+    pub where_predicates: Vec<String>,
+}
+
+impl FunctionSignature {
+    pub(crate) fn with_doc_opt(mut self, doc: Option<Documentation>) -> Self {
+        self.doc = doc;
+        self
+    }
+
+    pub(crate) fn from_hir(db: &db::RootDatabase, function: hir::Function) -> Self {
+        let doc = function.docs(db);
+        let (_, ast_node) = function.source(db);
+        FunctionSignature::from(&*ast_node).with_doc_opt(doc)
+    }
+}
+
+impl From<&'_ ast::FnDef> for FunctionSignature {
+    fn from(node: &ast::FnDef) -> FunctionSignature {
+        fn param_list(node: &ast::FnDef) -> Vec<String> {
+            let mut res = vec![];
+            if let Some(param_list) = node.param_list() {
+                if let Some(self_param) = param_list.self_param() {
+                    res.push(self_param.syntax().text().to_string())
+                }
+
+                res.extend(param_list.params().map(|param| param.syntax().text().to_string()));
+            }
+            res
+        }
+
+        FunctionSignature {
+            visibility: node.visibility().map(|n| n.syntax().text().to_string()),
+            name: node.name().map(|n| n.text().to_string()),
+            ret_type: node
+                .ret_type()
+                .and_then(|r| r.type_ref())
+                .map(|n| n.syntax().text().to_string()),
+            parameters: param_list(node),
+            generic_parameters: generic_parameters(node),
+            where_predicates: where_predicates(node),
+            // docs are processed separately
+            doc: None,
+        }
+    }
+}
+
+impl Display for FunctionSignature {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        if let Some(t) = &self.visibility {
+            write!(f, "{} ", t)?;
+        }
+
+        if let Some(name) = &self.name {
+            write!(f, "fn {}", name)?;
+        }
+
+        if !self.generic_parameters.is_empty() {
+            join(self.generic_parameters.iter())
+                .separator(", ")
+                .surround_with("<", ">")
+                .to_fmt(f)?;
+        }
+
+        join(self.parameters.iter()).separator(", ").surround_with("(", ")").to_fmt(f)?;
+
+        if let Some(t) = &self.ret_type {
+            write!(f, " -> {}", t)?;
+        }
+
+        if !self.where_predicates.is_empty() {
+            write!(f, "\nwhere ")?;
+            join(self.where_predicates.iter()).separator(",\n      ").to_fmt(f)?;
+        }
+
+        Ok(())
+    }
+}