1 files changed, 120 insertions, 0 deletions

diff --git a/crates/ra_ide/src/completion/complete_snippet.rs b/crates/ra_ide/src/completion/complete_snippet.rs
new file mode 100644
index 000000000..1f2988b36
--- /dev/null
+++ b/crates/ra_ide/src/completion/complete_snippet.rs
@@ -0,0 +1,120 @@
+//! FIXME: write short doc here
+
+use crate::completion::{
+    completion_item::Builder, CompletionContext, CompletionItem, CompletionItemKind,
+    CompletionKind, Completions,
+};
+
+fn snippet(ctx: &CompletionContext, label: &str, snippet: &str) -> Builder {
+    CompletionItem::new(CompletionKind::Snippet, ctx.source_range(), label)
+        .insert_snippet(snippet)
+        .kind(CompletionItemKind::Snippet)
+}
+
+pub(super) fn complete_expr_snippet(acc: &mut Completions, ctx: &CompletionContext) {
+    if !(ctx.is_trivial_path && ctx.function_syntax.is_some()) {
+        return;
+    }
+
+    snippet(ctx, "pd", "eprintln!(\"$0 = {:?}\", $0);").add_to(acc);
+    snippet(ctx, "ppd", "eprintln!(\"$0 = {:#?}\", $0);").add_to(acc);
+}
+
+pub(super) fn complete_item_snippet(acc: &mut Completions, ctx: &CompletionContext) {
+    if !ctx.is_new_item {
+        return;
+    }
+    snippet(
+        ctx,
+        "Test function",
+        "\
+#[test]
+fn ${1:feature}() {
+    $0
+}",
+    )
+    .lookup_by("tfn")
+    .add_to(acc);
+
+    snippet(ctx, "pub(crate)", "pub(crate) $0").add_to(acc);
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::completion::{do_completion, CompletionItem, CompletionKind};
+    use insta::assert_debug_snapshot;
+
+    fn do_snippet_completion(code: &str) -> Vec<CompletionItem> {
+        do_completion(code, CompletionKind::Snippet)
+    }
+
+    #[test]
+    fn completes_snippets_in_expressions() {
+        assert_debug_snapshot!(
+                    do_snippet_completion(r"fn foo(x: i32) { <|> }"),
+        @r###"
+        [
+            CompletionItem {
+                label: "pd",
+                source_range: [17; 17),
+                delete: [17; 17),
+                insert: "eprintln!(\"$0 = {:?}\", $0);",
+                kind: Snippet,
+            },
+            CompletionItem {
+                label: "ppd",
+                source_range: [17; 17),
+                delete: [17; 17),
+                insert: "eprintln!(\"$0 = {:#?}\", $0);",
+                kind: Snippet,
+            },
+        ]
+        "###
+                );
+    }
+
+    #[test]
+    fn should_not_complete_snippets_in_path() {
+        assert_debug_snapshot!(
+                    do_snippet_completion(r"fn foo(x: i32) { ::foo<|> }"),
+        @"[]"
+                );
+        assert_debug_snapshot!(
+                    do_snippet_completion(r"fn foo(x: i32) { ::<|> }"),
+        @"[]"
+                );
+    }
+
+    #[test]
+    fn completes_snippets_in_items() {
+        assert_debug_snapshot!(
+            do_snippet_completion(
+                r"
+                #[cfg(test)]
+                mod tests {
+                    <|>
+                }
+                "
+            ),
+            @r###"
+        [
+            CompletionItem {
+                label: "Test function",
+                source_range: [78; 78),
+                delete: [78; 78),
+                insert: "#[test]\nfn ${1:feature}() {\n    $0\n}",
+                kind: Snippet,
+                lookup: "tfn",
+            },
+            CompletionItem {
+                label: "pub(crate)",
+                source_range: [78; 78),
+                delete: [78; 78),
+                insert: "pub(crate) $0",
+                kind: Snippet,
+            },
+        ]
+        "###
+        );
+    }
+}