fix: Add pipe to first snippet when not alone

Author: Muscraft

examples/multislice.svg

@@ -1006,11 +1006,13 @@ fn format_message(
         format_footer(level, id, title)
     };
 
+    let num_snippets = snippets.len();
     for (idx, snippet) in snippets.into_iter().enumerate() {
         let snippet = fold_prefix_suffix(snippet);
         sets.push(format_snippet(
             snippet,
             idx == 0,
+            idx == 0 && num_snippets > 1,
             term_width,
             anonymized_line_numbers,
         ));
@@ -1089,6 +1091,7 @@ fn format_label(
 fn format_snippet(
     snippet: snippet::Snippet<'_>,
     is_first: bool,
+    needs_trailing_pipe: bool,
     term_width: usize,
     anonymized_line_numbers: bool,
 ) -> DisplaySet<'_> {
@@ -1098,6 +1101,7 @@ fn format_snippet(
     let mut body = format_body(
         snippet,
         need_empty_header,
+        needs_trailing_pipe,
         term_width,
         anonymized_line_numbers,
     );
@@ -1285,6 +1289,7 @@ fn fold_body(body: Vec<DisplayLine<'_>>) -> Vec<DisplayLine<'_>> {
 fn format_body(
     snippet: snippet::Snippet<'_>,
     need_empty_header: bool,
+    needs_trailing_pipe: bool,
     term_width: usize,
     anonymized_line_numbers: bool,
 ) -> DisplaySet<'_> {
@@ -1599,6 +1604,15 @@ fn format_body(
         );
     }
 
+    if needs_trailing_pipe {
+        body.push(DisplayLine::Source {
+            lineno: None,
+            inline_marks: vec![],
+            line: DisplaySourceLine::Empty,
+            annotations: vec![],
+        });
+    }
+
     let max_line_num_len = if anonymized_line_numbers {
         ANONYMIZED_LINE_NUM.len()
     } else {

src/renderer/display_list.rs

@@ -146,6 +146,7 @@ error
     --> file1.rs
      |
 5402 | This is slice 1
+     |
     ::: file2.rs
      |
    2 | This is slice 2

tests/fixtures/color/issue_9.svg

@@ -1323,6 +1323,7 @@ LL | |             ($bang_macro:ident, $attr_macro:ident) => {
 LL | |             }
 LL | |         }
    | |_________^
+   |
   ::: $DIR/nested-macro-rules.rs:23:5
    |
 LL |       nested_macro_rules::outer_macro!(SecondStruct, SecondAttrStruct);
@@ -1697,6 +1698,7 @@ note: for a trait to be dyn compatible it needs to allow building a vtable
 for more information, visit <https://doc.rust-lang.org/reference/items/traits.html#dyn-compatibility>
   --> $SRC_DIR/core/src/cmp.rs
    |
+   |
   ::: $DIR/object-fail.rs:3:7
    |
 LL | trait EqAlias = Eq;