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crates/ide_assists/src/handlers/convert_comment_block.rs

@@ -1,8 +1,14 @@
-use ast::{Comment, CommentShape};
 use itertools::Itertools;
 use std::convert::identity;
 use syntax::{
-    ast::{self, edit::IndentLevel, CommentKind, Whitespace},
+    ast::{
+        self,
+        edit::IndentLevel,
+        Comment, CommentKind,
+        CommentPlacement::{Inner, Outer},
+        CommentShape::{self, Block, Line},
+        Whitespace,
+    },
     AstToken, Direction, SyntaxElement, TextRange,
 };
 
@@ -42,6 +48,13 @@ pub(crate) fn convert_comment_block(acc: &mut Assists, ctx: &AssistContext) -> O
 }
 
 fn block_to_line(acc: &mut Assists, comment: ast::Comment) -> Option<()> {
+    let target = comment.syntax().text_range();
+
+    acc.add(
+        AssistId("block_to_line", AssistKind::RefactorRewrite),
+        "Replace block comment with line comments",
+        target,
+        |edit| {
             let indentation = IndentLevel::from_token(comment.syntax());
             let line_prefix =
                 comment_kind_prefix(CommentKind { shape: CommentShape::Line, ..comment.kind() });
@@ -64,12 +77,8 @@ fn block_to_line(acc: &mut Assists, comment: ast::Comment) -> Option<()> {
                 })
                 .join(&format!("\n{}", indent_spaces));
 
-    let target = comment.syntax().text_range();
-    acc.add(
-        AssistId("block_to_line", AssistKind::RefactorRewrite),
-        "Replace block comment with line comments",
-        target,
-        |edit| edit.replace(target, output),
+            edit.replace(target, output)
+        },
     )
 }
 
@@ -83,6 +92,11 @@ fn line_to_block(acc: &mut Assists, comment: ast::Comment) -> Option<()> {
         comments.last().unwrap().syntax().text_range().end(),
     );
 
+    acc.add(
+        AssistId("line_to_block", AssistKind::RefactorRewrite),
+        "Replace line comments with a single block comment",
+        target,
+        |edit| {
             // We pick a single indentation level for the whole block comment based on the
             // comment where the assist was invoked. This will be prepended to the
             // contents of each line comment when they're put into the block comment.
@@ -94,13 +108,11 @@ fn line_to_block(acc: &mut Assists, comment: ast::Comment) -> Option<()> {
             let block_prefix =
                 comment_kind_prefix(CommentKind { shape: CommentShape::Block, ..comment.kind() });
 
-    let output = format!("{}\n{}\n{}*/", block_prefix, block_comment_body, indentation.to_string());
+            let output =
+                format!("{}\n{}\n{}*/", block_prefix, block_comment_body, indentation.to_string());
 
-    acc.add(
-        AssistId("line_to_block", AssistKind::RefactorRewrite),
-        "Replace line comments with a single block comment",
-        target,
-        |edit| edit.replace(target, output),
+            edit.replace(target, output)
+        },
     )
 }
 
@@ -160,27 +172,18 @@ fn relevant_line_comments(comment: &ast::Comment) -> Vec<Comment> {
 //
 // But since such comments aren't idiomatic we're okay with this.
 fn line_comment_text(indentation: IndentLevel, comm: ast::Comment) -> String {
-    let contents = trim_one(comm.text().strip_prefix(comm.prefix()).unwrap()).to_owned();
+    let contents_without_prefix = comm.text().strip_prefix(comm.prefix()).unwrap();
+    let contents = contents_without_prefix.strip_prefix(' ').unwrap_or(contents_without_prefix);
 
     // Don't add the indentation if the line is empty
     if contents.is_empty() {
-        contents
+        contents.to_owned()
     } else {
         indentation.to_string() + &contents
     }
 }
 
-fn trim_one(text: &str) -> &str {
-    if text.starts_with(' ') {
-        &text[1..]
-    } else {
-        text
-    }
-}
-
 fn comment_kind_prefix(ck: ast::CommentKind) -> &'static str {
-    use ast::CommentPlacement::{Inner, Outer};
-    use ast::CommentShape::{Block, Line};
     match (ck.shape, ck.doc) {
         (Line, Some(Inner)) => "//!",
         (Line, Some(Outer)) => "///",