KISS SourceChange

The idea behind requiring the label is a noble one, but we are not
really using it consistently anyway, and it should be easy to retrofit
later, should we need it.

8 files changed, 112 insertions, 153 deletions

diff --git a/crates/ra_assists/src/assist_context.rs b/crates/ra_assists/src/assist_context.rs
index f3af70a3e..5b1a4680b 100644
--- a/crates/ra_assists/src/assist_context.rs
+++ b/crates/ra_assists/src/assist_context.rs
@@ -5,7 +5,7 @@ use hir::Semantics;
 use ra_db::{FileId, FileRange};
 use ra_fmt::{leading_indent, reindent};
 use ra_ide_db::{
-    source_change::{SingleFileChange, SourceChange},
+    source_change::{SourceChange, SourceFileEdit},
     RootDatabase,
 };
 use ra_syntax::{
@@ -150,11 +150,10 @@ impl Assists {
         self.add_impl(label, f)
     }
     fn add_impl(&mut self, label: Assist, f: impl FnOnce(&mut AssistBuilder)) -> Option<()> {
-        let change_label = label.label.clone();
         let source_change = if self.resolve {
             let mut builder = AssistBuilder::new(self.file);
             f(&mut builder);
-            Some(builder.finish(change_label))
+            Some(builder.finish())
         } else {
             None
         };
@@ -246,9 +245,10 @@ impl AssistBuilder {
         &mut self.edit
     }
 
-    fn finish(self, change_label: String) -> SourceChange {
+    fn finish(self) -> SourceChange {
         let edit = self.edit.finish();
-        let mut res = SingleFileChange { label: change_label, edit }.into_source_change(self.file);
+        let source_file_edit = SourceFileEdit { file_id: self.file, edit };
+        let mut res: SourceChange = source_file_edit.into();
         if self.is_snippet {
             res.is_snippet = true;
         }
diff --git a/crates/ra_ide/src/diagnostics.rs b/crates/ra_ide/src/diagnostics.rs
index c2819bbf7..3d83c0f71 100644
--- a/crates/ra_ide/src/diagnostics.rs
+++ b/crates/ra_ide/src/diagnostics.rs
@@ -21,7 +21,7 @@ use ra_syntax::{
 };
 use ra_text_edit::{TextEdit, TextEditBuilder};
 
-use crate::{Diagnostic, FileId, FileSystemEdit, SourceChange, SourceFileEdit};
+use crate::{Diagnostic, FileId, FileSystemEdit, Fix, SourceChange, SourceFileEdit};
 
 #[derive(Debug, Copy, Clone)]
 pub enum Severity {
@@ -63,8 +63,8 @@ pub(crate) fn diagnostics(db: &RootDatabase, file_id: FileId) -> Vec<Diagnostic>
             .parent()
             .unwrap_or_else(|| RelativePath::new(""))
             .join(&d.candidate);
-        let create_file = FileSystemEdit::CreateFile { source_root, path };
-        let fix = SourceChange::file_system_edit("Create module", create_file);
+        let fix =
+            Fix::new("Create module", FileSystemEdit::CreateFile { source_root, path }.into());
         res.borrow_mut().push(Diagnostic {
             range: sema.diagnostics_range(d).range,
             message: d.message(),
@@ -88,14 +88,12 @@ pub(crate) fn diagnostics(db: &RootDatabase, file_id: FileId) -> Vec<Diagnostic>
                 field_list = field_list.append_field(&field);
             }
 
-            let mut builder = TextEditBuilder::default();
-            algo::diff(&d.ast(db).syntax(), &field_list.syntax()).into_text_edit(&mut builder);
-
-            Some(SourceChange::source_file_edit_from(
-                "Fill struct fields",
-                file_id,
-                builder.finish(),
-            ))
+            let edit = {
+                let mut builder = TextEditBuilder::default();
+                algo::diff(&d.ast(db).syntax(), &field_list.syntax()).into_text_edit(&mut builder);
+                builder.finish()
+            };
+            Some(Fix::new("Fill struct fields", SourceFileEdit { file_id, edit }.into()))
         };
 
         res.borrow_mut().push(Diagnostic {
@@ -117,7 +115,8 @@ pub(crate) fn diagnostics(db: &RootDatabase, file_id: FileId) -> Vec<Diagnostic>
         let node = d.ast(db);
         let replacement = format!("Ok({})", node.syntax());
         let edit = TextEdit::replace(node.syntax().text_range(), replacement);
-        let fix = SourceChange::source_file_edit_from("Wrap with ok", file_id, edit);
+        let source_change = SourceChange::source_file_edit_from(file_id, edit);
+        let fix = Fix::new("Wrap with ok", source_change);
         res.borrow_mut().push(Diagnostic {
             range: sema.diagnostics_range(d).range,
             message: d.message(),
@@ -154,9 +153,9 @@ fn check_unnecessary_braces_in_use_statement(
             range,
             message: "Unnecessary braces in use statement".to_string(),
             severity: Severity::WeakWarning,
-            fix: Some(SourceChange::source_file_edit(
+            fix: Some(Fix::new(
                 "Remove unnecessary braces",
-                SourceFileEdit { file_id, edit },
+                SourceFileEdit { file_id, edit }.into(),
             )),
         });
     }
@@ -198,9 +197,9 @@ fn check_struct_shorthand_initialization(
                     range: record_field.syntax().text_range(),
                     message: "Shorthand struct initialization".to_string(),
                     severity: Severity::WeakWarning,
-                    fix: Some(SourceChange::source_file_edit(
+                    fix: Some(Fix::new(
                         "Use struct shorthand initialization",
-                        SourceFileEdit { file_id, edit },
+                        SourceFileEdit { file_id, edit }.into(),
                     )),
                 });
             }
@@ -240,7 +239,7 @@ mod tests {
         let diagnostic =
             diagnostics.pop().unwrap_or_else(|| panic!("no diagnostics for:\n{}\n", before));
         let mut fix = diagnostic.fix.unwrap();
-        let edit = fix.source_file_edits.pop().unwrap().edit;
+        let edit = fix.source_change.source_file_edits.pop().unwrap().edit;
         let actual = {
             let mut actual = before.to_string();
             edit.apply(&mut actual);
@@ -258,7 +257,7 @@ mod tests {
         let (analysis, file_position) = analysis_and_position(fixture);
         let diagnostic = analysis.diagnostics(file_position.file_id).unwrap().pop().unwrap();
         let mut fix = diagnostic.fix.unwrap();
-        let edit = fix.source_file_edits.pop().unwrap().edit;
+        let edit = fix.source_change.source_file_edits.pop().unwrap().edit;
         let target_file_contents = analysis.file_text(file_position.file_id).unwrap();
         let actual = {
             let mut actual = target_file_contents.to_string();
@@ -295,7 +294,7 @@ mod tests {
         let (analysis, file_id) = single_file(before);
         let diagnostic = analysis.diagnostics(file_id).unwrap().pop().unwrap();
         let mut fix = diagnostic.fix.unwrap();
-        let edit = fix.source_file_edits.pop().unwrap().edit;
+        let edit = fix.source_change.source_file_edits.pop().unwrap().edit;
         let actual = {
             let mut actual = before.to_string();
             edit.apply(&mut actual);
@@ -616,22 +615,24 @@ mod tests {
             Diagnostic {
                 message: "unresolved module",
                 range: 0..8,
+                severity: Error,
                 fix: Some(
-                    SourceChange {
+                    Fix {
                         label: "Create module",
-                        source_file_edits: [],
-                        file_system_edits: [
-                            CreateFile {
-                                source_root: SourceRootId(
-                                    0,
-                                ),
-                                path: "foo.rs",
-                            },
-                        ],
-                        is_snippet: false,
+                        source_change: SourceChange {
+                            source_file_edits: [],
+                            file_system_edits: [
+                                CreateFile {
+                                    source_root: SourceRootId(
+                                        0,
+                                    ),
+                                    path: "foo.rs",
+                                },
+                            ],
+                            is_snippet: false,
+                        },
                     },
                 ),
-                severity: Error,
             },
         ]
         "###);
@@ -665,29 +666,31 @@ mod tests {
             Diagnostic {
                 message: "Missing structure fields:\n- b",
                 range: 224..233,
+                severity: Error,
                 fix: Some(
-                    SourceChange {
+                    Fix {
                         label: "Fill struct fields",
-                        source_file_edits: [
-                            SourceFileEdit {
-                                file_id: FileId(
-                                    1,
-                                ),
-                                edit: TextEdit {
-                                    indels: [
-                                        Indel {
-                                            insert: "{a:42, b: ()}",
-                                            delete: 3..9,
-                                        },
-                                    ],
+                        source_change: SourceChange {
+                            source_file_edits: [
+                                SourceFileEdit {
+                                    file_id: FileId(
+                                        1,
+                                    ),
+                                    edit: TextEdit {
+                                        indels: [
+                                            Indel {
+                                                insert: "{a:42, b: ()}",
+                                                delete: 3..9,
+                                            },
+                                        ],
+                                    },
                                 },
-                            },
-                        ],
-                        file_system_edits: [],
-                        is_snippet: false,
+                            ],
+                            file_system_edits: [],
+                            is_snippet: false,
+                        },
                     },
                 ),
-                severity: Error,
             },
         ]
         "###);
diff --git a/crates/ra_ide/src/lib.rs b/crates/ra_ide/src/lib.rs
index 97ff67ee8..5ac002d82 100644
--- a/crates/ra_ide/src/lib.rs
+++ b/crates/ra_ide/src/lib.rs
@@ -97,8 +97,22 @@ pub type Cancelable<T> = Result<T, Canceled>;
 pub struct Diagnostic {
     pub message: String,
     pub range: TextRange,
-    pub fix: Option<SourceChange>,
     pub severity: Severity,
+    pub fix: Option<Fix>,
+}
+
+#[derive(Debug)]
+pub struct Fix {
+    pub label: String,
+    pub source_change: SourceChange,
+}
+
+impl Fix {
+    pub fn new(label: impl Into<String>, source_change: SourceChange) -> Self {
+        let label = label.into();
+        assert!(label.starts_with(char::is_uppercase) && !label.ends_with('.'));
+        Self { label, source_change }
+    }
 }
 
 /// Info associated with a text range.
@@ -493,7 +507,7 @@ impl Analysis {
     ) -> Cancelable<Result<SourceChange, SsrError>> {
         self.with_db(|db| {
             let edits = ssr::parse_search_replace(query, parse_only, db)?;
-            Ok(SourceChange::source_file_edits("Structural Search Replace", edits))
+            Ok(SourceChange::source_file_edits(edits))
         })
     }
 
diff --git a/crates/ra_ide/src/references/rename.rs b/crates/ra_ide/src/references/rename.rs
index fd2163dad..28c6349b1 100644
--- a/crates/ra_ide/src/references/rename.rs
+++ b/crates/ra_ide/src/references/rename.rs
@@ -128,7 +128,7 @@ fn rename_mod(
         source_file_edits.extend(ref_edits);
     }
 
-    Some(SourceChange::from_edits("Rename", source_file_edits, file_system_edits))
+    Some(SourceChange::from_edits(source_file_edits, file_system_edits))
 }
 
 fn rename_to_self(db: &RootDatabase, position: FilePosition) -> Option<RangeInfo<SourceChange>> {
@@ -171,7 +171,7 @@ fn rename_to_self(db: &RootDatabase, position: FilePosition) -> Option<RangeInfo
         ),
     });
 
-    Some(RangeInfo::new(range, SourceChange::source_file_edits("Rename", edits)))
+    Some(RangeInfo::new(range, SourceChange::source_file_edits(edits)))
 }
 
 fn text_edit_from_self_param(
@@ -234,7 +234,7 @@ fn rename_self_to_param(
     let range = ast::SelfParam::cast(self_token.parent())
         .map_or(self_token.text_range(), |p| p.syntax().text_range());
 
-    Some(RangeInfo::new(range, SourceChange::source_file_edits("Rename", edits)))
+    Some(RangeInfo::new(range, SourceChange::source_file_edits(edits)))
 }
 
 fn rename_reference(
@@ -253,7 +253,7 @@ fn rename_reference(
         return None;
     }
 
-    Some(RangeInfo::new(range, SourceChange::source_file_edits("Rename", edit)))
+    Some(RangeInfo::new(range, SourceChange::source_file_edits(edit)))
 }
 
 #[cfg(test)]
@@ -642,7 +642,6 @@ mod tests {
             RangeInfo {
                 range: 4..7,
                 info: SourceChange {
-                    label: "Rename",
                     source_file_edits: [
                         SourceFileEdit {
                             file_id: FileId(
@@ -694,7 +693,6 @@ mod tests {
             RangeInfo {
                 range: 4..7,
                 info: SourceChange {
-                    label: "Rename",
                     source_file_edits: [
                         SourceFileEdit {
                             file_id: FileId(
@@ -777,7 +775,6 @@ mod tests {
             RangeInfo {
                 range: 8..11,
                 info: SourceChange {
-                    label: "Rename",
                     source_file_edits: [
                         SourceFileEdit {
                             file_id: FileId(
diff --git a/crates/ra_ide/src/typing.rs b/crates/ra_ide/src/typing.rs
index cd48cad93..39bb3b357 100644
--- a/crates/ra_ide/src/typing.rs
+++ b/crates/ra_ide/src/typing.rs
@@ -17,7 +17,7 @@ mod on_enter;
 
 use ra_db::{FilePosition, SourceDatabase};
 use ra_fmt::leading_indent;
-use ra_ide_db::{source_change::SingleFileChange, RootDatabase};
+use ra_ide_db::RootDatabase;
 use ra_syntax::{
     algo::find_node_at_offset,
     ast::{self, AstToken},
@@ -40,15 +40,11 @@ pub(crate) fn on_char_typed(
     assert!(TRIGGER_CHARS.contains(char_typed));
     let file = &db.parse(position.file_id).tree();
     assert_eq!(file.syntax().text().char_at(position.offset), Some(char_typed));
-    let single_file_change = on_char_typed_inner(file, position.offset, char_typed)?;
-    Some(single_file_change.into_source_change(position.file_id))
+    let text_edit = on_char_typed_inner(file, position.offset, char_typed)?;
+    Some(SourceChange::source_file_edit_from(position.file_id, text_edit))
 }
 
-fn on_char_typed_inner(
-    file: &SourceFile,
-    offset: TextSize,
-    char_typed: char,
-) -> Option<SingleFileChange> {
+fn on_char_typed_inner(file: &SourceFile, offset: TextSize, char_typed: char) -> Option<TextEdit> {
     assert!(TRIGGER_CHARS.contains(char_typed));
     match char_typed {
         '.' => on_dot_typed(file, offset),
@@ -61,7 +57,7 @@ fn on_char_typed_inner(
 /// Returns an edit which should be applied after `=` was typed. Primarily,
 /// this works when adding `let =`.
 // FIXME: use a snippet completion instead of this hack here.
-fn on_eq_typed(file: &SourceFile, offset: TextSize) -> Option<SingleFileChange> {
+fn on_eq_typed(file: &SourceFile, offset: TextSize) -> Option<TextEdit> {
     assert_eq!(file.syntax().text().char_at(offset), Some('='));
     let let_stmt: ast::LetStmt = find_node_at_offset(file.syntax(), offset)?;
     if let_stmt.semicolon_token().is_some() {
@@ -79,14 +75,11 @@ fn on_eq_typed(file: &SourceFile, offset: TextSize) -> Option<SingleFileChange>
         return None;
     }
     let offset = let_stmt.syntax().text_range().end();
-    Some(SingleFileChange {
-        label: "add semicolon".to_string(),
-        edit: TextEdit::insert(offset, ";".to_string()),
-    })
+    Some(TextEdit::insert(offset, ";".to_string()))
 }
 
 /// Returns an edit which should be applied when a dot ('.') is typed on a blank line, indenting the line appropriately.
-fn on_dot_typed(file: &SourceFile, offset: TextSize) -> Option<SingleFileChange> {
+fn on_dot_typed(file: &SourceFile, offset: TextSize) -> Option<TextEdit> {
     assert_eq!(file.syntax().text().char_at(offset), Some('.'));
     let whitespace =
         file.syntax().token_at_offset(offset).left_biased().and_then(ast::Whitespace::cast)?;
@@ -107,14 +100,11 @@ fn on_dot_typed(file: &SourceFile, offset: TextSize) -> Option<SingleFileChange>
         return None;
     }
 
-    Some(SingleFileChange {
-        label: "reindent dot".to_string(),
-        edit: TextEdit::replace(TextRange::new(offset - current_indent_len, offset), target_indent),
-    })
+    Some(TextEdit::replace(TextRange::new(offset - current_indent_len, offset), target_indent))
 }
 
 /// Adds a space after an arrow when `fn foo() { ... }` is turned into `fn foo() -> { ... }`
-fn on_arrow_typed(file: &SourceFile, offset: TextSize) -> Option<SingleFileChange> {
+fn on_arrow_typed(file: &SourceFile, offset: TextSize) -> Option<TextEdit> {
     let file_text = file.syntax().text();
     assert_eq!(file_text.char_at(offset), Some('>'));
     let after_arrow = offset + TextSize::of('>');
@@ -125,10 +115,7 @@ fn on_arrow_typed(file: &SourceFile, offset: TextSize) -> Option<SingleFileChang
         return None;
     }
 
-    Some(SingleFileChange {
-        label: "add space after return type".to_string(),
-        edit: TextEdit::insert(after_arrow, " ".to_string()),
-    })
+    Some(TextEdit::insert(after_arrow, " ".to_string()))
 }
 
 #[cfg(test)]
@@ -144,7 +131,7 @@ mod tests {
         edit.apply(&mut before);
         let parse = SourceFile::parse(&before);
         on_char_typed_inner(&parse.tree(), offset, char_typed).map(|it| {
-            it.edit.apply(&mut before);
+            it.apply(&mut before);
             before.to_string()
         })
     }
diff --git a/crates/ra_ide/src/typing/on_enter.rs b/crates/ra_ide/src/typing/on_enter.rs
index 85be14ad3..e7d64b4f6 100644
--- a/crates/ra_ide/src/typing/on_enter.rs
+++ b/crates/ra_ide/src/typing/on_enter.rs
@@ -41,10 +41,7 @@ pub(crate) fn on_enter(db: &RootDatabase, position: FilePosition) -> Option<Sour
     let inserted = format!("\n{}{} $0", indent, prefix);
     let edit = TextEdit::insert(position.offset, inserted);
 
-    let mut res = SourceChange::source_file_edit(
-        "On enter",
-        SourceFileEdit { edit, file_id: position.file_id },
-    );
+    let mut res = SourceChange::from(SourceFileEdit { edit, file_id: position.file_id });
     res.is_snippet = true;
     Some(res)
 }
diff --git a/crates/ra_ide_db/src/source_change.rs b/crates/ra_ide_db/src/source_change.rs
index 3484f5588..e713f4b7e 100644
--- a/crates/ra_ide_db/src/source_change.rs
+++ b/crates/ra_ide_db/src/source_change.rs
@@ -8,8 +8,6 @@ use ra_text_edit::TextEdit;
 
 #[derive(Debug, Clone)]
 pub struct SourceChange {
-    /// For display in the undo log in the editor
-    pub label: String,
     pub source_file_edits: Vec<SourceFileEdit>,
     pub file_system_edits: Vec<FileSystemEdit>,
     pub is_snippet: bool,
@@ -18,63 +16,22 @@ pub struct SourceChange {
 impl SourceChange {
     /// Creates a new SourceChange with the given label
     /// from the edits.
-    pub fn from_edits<L: Into<String>>(
-        label: L,
+    pub fn from_edits(
         source_file_edits: Vec<SourceFileEdit>,
         file_system_edits: Vec<FileSystemEdit>,
     ) -> Self {
-        SourceChange {
-            label: label.into(),
-            source_file_edits,
-            file_system_edits,
-            is_snippet: false,
-        }
+        SourceChange { source_file_edits, file_system_edits, is_snippet: false }
     }
 
     /// Creates a new SourceChange with the given label,
     /// containing only the given `SourceFileEdits`.
-    pub fn source_file_edits<L: Into<String>>(label: L, edits: Vec<SourceFileEdit>) -> Self {
-        let label = label.into();
-        assert!(label.starts_with(char::is_uppercase));
-        SourceChange {
-            label: label,
-            source_file_edits: edits,
-            file_system_edits: vec![],
-            is_snippet: false,
-        }
-    }
-
-    /// Creates a new SourceChange with the given label,
-    /// containing only the given `FileSystemEdits`.
-    pub(crate) fn file_system_edits<L: Into<String>>(label: L, edits: Vec<FileSystemEdit>) -> Self {
-        SourceChange {
-            label: label.into(),
-            source_file_edits: vec![],
-            file_system_edits: edits,
-            is_snippet: false,
-        }
-    }
-
-    /// Creates a new SourceChange with the given label,
-    /// containing only a single `SourceFileEdit`.
-    pub fn source_file_edit<L: Into<String>>(label: L, edit: SourceFileEdit) -> Self {
-        SourceChange::source_file_edits(label, vec![edit])
-    }
-
-    /// Creates a new SourceChange with the given label
-    /// from the given `FileId` and `TextEdit`
-    pub fn source_file_edit_from<L: Into<String>>(
-        label: L,
-        file_id: FileId,
-        edit: TextEdit,
-    ) -> Self {
-        SourceChange::source_file_edit(label, SourceFileEdit { file_id, edit })
+    pub fn source_file_edits(edits: Vec<SourceFileEdit>) -> Self {
+        SourceChange { source_file_edits: edits, file_system_edits: vec![], is_snippet: false }
     }
-
     /// Creates a new SourceChange with the given label
     /// from the given `FileId` and `TextEdit`
-    pub fn file_system_edit<L: Into<String>>(label: L, edit: FileSystemEdit) -> Self {
-        SourceChange::file_system_edits(label, vec![edit])
+    pub fn source_file_edit_from(file_id: FileId, edit: TextEdit) -> Self {
+        SourceFileEdit { file_id, edit }.into()
     }
 }
 
@@ -84,23 +41,27 @@ pub struct SourceFileEdit {
     pub edit: TextEdit,
 }
 
+impl From<SourceFileEdit> for SourceChange {
+    fn from(edit: SourceFileEdit) -> SourceChange {
+        SourceChange {
+            source_file_edits: vec![edit],
+            file_system_edits: Vec::new(),
+            is_snippet: false,
+        }
+    }
+}
+
 #[derive(Debug, Clone)]
 pub enum FileSystemEdit {
     CreateFile { source_root: SourceRootId, path: RelativePathBuf },
     MoveFile { src: FileId, dst_source_root: SourceRootId, dst_path: RelativePathBuf },
 }
 
-pub struct SingleFileChange {
-    pub label: String,
-    pub edit: TextEdit,
-}
-
-impl SingleFileChange {
-    pub fn into_source_change(self, file_id: FileId) -> SourceChange {
+impl From<FileSystemEdit> for SourceChange {
+    fn from(edit: FileSystemEdit) -> SourceChange {
         SourceChange {
-            label: self.label,
-            source_file_edits: vec![SourceFileEdit { file_id, edit: self.edit }],
-            file_system_edits: Vec::new(),
+            source_file_edits: Vec::new(),
+            file_system_edits: vec![edit],
             is_snippet: false,
         }
     }
diff --git a/crates/rust-analyzer/src/main_loop/handlers.rs b/crates/rust-analyzer/src/main_loop/handlers.rs
index 89144f743..a9703e1d6 100644
--- a/crates/rust-analyzer/src/main_loop/handlers.rs
+++ b/crates/rust-analyzer/src/main_loop/handlers.rs
@@ -731,9 +731,9 @@ pub fn handle_code_action(
         .filter(|(diag_range, _fix)| diag_range.intersect(range).is_some())
         .map(|(_range, fix)| fix);
 
-    for source_edit in fixes_from_diagnostics {
-        let title = source_edit.label.clone();
-        let edit = to_proto::snippet_workspace_edit(&world, source_edit)?;
+    for fix in fixes_from_diagnostics {
+        let title = fix.label;
+        let edit = to_proto::snippet_workspace_edit(&world, fix.source_change)?;
         let action =
             lsp_ext::CodeAction { title, group: None, kind: None, edit: Some(edit), command: None };
         res.push(action);