From 8eccf15964e09c2e024710512e671c6b1b88e885 Mon Sep 17 00:00:00 2001
From: Akshay <nerdy@peppe.rs>
Date: Wed, 27 Oct 2021 19:50:52 +0530
Subject: add 3 new lints, bump to v0.2.3

- empty_pattern
- redundant_pattern_bind
- unquoted_splice
---
 lib/src/lints.rs                        |  3 +++
 lib/src/lints/empty_pattern.rs          | 37 +++++++++++++++++++++++++++++
 lib/src/lints/redundant_pattern_bind.rs | 41 +++++++++++++++++++++++++++++++++
 lib/src/lints/unquoted_splice.rs        | 33 ++++++++++++++++++++++++++
 lib/src/make.rs                         |  4 ++++
 5 files changed, 118 insertions(+)
 create mode 100644 lib/src/lints/empty_pattern.rs
 create mode 100644 lib/src/lints/redundant_pattern_bind.rs
 create mode 100644 lib/src/lints/unquoted_splice.rs

(limited to 'lib/src')

diff --git a/lib/src/lints.rs b/lib/src/lints.rs
index f7e98ac..09cd77c 100644
--- a/lib/src/lints.rs
+++ b/lib/src/lints.rs
@@ -9,4 +9,7 @@ lint_map! {
     collapsible_let_in,
     eta_reduction,
     useless_parens,
+    unquoted_splice,
+    empty_pattern,
+    redundant_pattern_bind,
 }
diff --git a/lib/src/lints/empty_pattern.rs b/lib/src/lints/empty_pattern.rs
new file mode 100644
index 0000000..6fb7558
--- /dev/null
+++ b/lib/src/lints/empty_pattern.rs
@@ -0,0 +1,37 @@
+use crate::{make, Lint, Metadata, Report, Rule, Suggestion};
+
+use if_chain::if_chain;
+use macros::lint;
+use rnix::{
+    types::{Pattern, TypedNode},
+    NodeOrToken, SyntaxElement, SyntaxKind,
+};
+
+#[lint(
+    name = "empty pattern",
+    note = "Found empty pattern in function argument",
+    code = 10,
+    match_with = SyntaxKind::NODE_PATTERN
+)]
+struct EmptyPattern;
+
+impl Rule for EmptyPattern {
+    fn validate(&self, node: &SyntaxElement) -> Option<Report> {
+        if_chain! {
+            if let NodeOrToken::Node(node) = node;
+            if let Some(pattern) = Pattern::cast(node.clone());
+            // no patterns within `{ }`
+            if pattern.entries().count() == 0;
+            // pattern is not bound
+            if pattern.at().is_none();
+            then {
+                let at = node.text_range();
+                let message = "This pattern is empty, use `_` instead";
+                let replacement = make::ident("_").node().clone();
+                Some(Self::report().suggest(at, message, Suggestion::new(at, replacement)))
+            } else {
+                None
+            }
+        }
+    }
+}
diff --git a/lib/src/lints/redundant_pattern_bind.rs b/lib/src/lints/redundant_pattern_bind.rs
new file mode 100644
index 0000000..aebc549
--- /dev/null
+++ b/lib/src/lints/redundant_pattern_bind.rs
@@ -0,0 +1,41 @@
+use crate::{Lint, Metadata, Report, Rule, Suggestion};
+
+use if_chain::if_chain;
+use macros::lint;
+use rnix::{
+    types::{Pattern, TokenWrapper, TypedNode},
+    NodeOrToken, SyntaxElement, SyntaxKind,
+};
+
+#[lint(
+    name = "redundant pattern bind",
+    note = "Found redundant pattern bind in function argument",
+    code = 10,
+    match_with = SyntaxKind::NODE_PATTERN
+)]
+struct RedundantPatternBind;
+
+impl Rule for RedundantPatternBind {
+    fn validate(&self, node: &SyntaxElement) -> Option<Report> {
+        if_chain! {
+            if let NodeOrToken::Node(node) = node;
+            if let Some(pattern) = Pattern::cast(node.clone());
+            // no patterns within `{ }`
+            if pattern.entries().count() == 0;
+
+            // pattern is just ellipsis
+            if pattern.ellipsis();
+
+            // pattern is bound
+            if let Some(ident) =  pattern.at();
+            then {
+                let at = node.text_range();
+                let message = format!("This pattern bind is redundant, use `{}` instead", ident.as_str());
+                let replacement = ident.node().clone();
+                Some(Self::report().suggest(at, message, Suggestion::new(at, replacement)))
+            } else {
+                None
+            }
+        }
+    }
+}
diff --git a/lib/src/lints/unquoted_splice.rs b/lib/src/lints/unquoted_splice.rs
new file mode 100644
index 0000000..4d1ed69
--- /dev/null
+++ b/lib/src/lints/unquoted_splice.rs
@@ -0,0 +1,33 @@
+use crate::{make, Lint, Metadata, Report, Rule, Suggestion};
+
+use if_chain::if_chain;
+use macros::lint;
+use rnix::{
+    types::{Dynamic, TypedNode},
+    NodeOrToken, SyntaxElement, SyntaxKind,
+};
+
+#[lint(
+    name = "unquoted splice",
+    note = "Found unquoted splice expression",
+    code = 9,
+    match_with = SyntaxKind::NODE_DYNAMIC
+)]
+struct UnquotedSplice;
+
+impl Rule for UnquotedSplice {
+    fn validate(&self, node: &SyntaxElement) -> Option<Report> {
+        if_chain! {
+            if let NodeOrToken::Node(node) = node;
+            if Dynamic::cast(node.clone()).is_some();
+            then {
+                let at = node.text_range();
+                let replacement = make::quote(&node).node().clone();
+                let message = "Consider quoting this splice expression";
+                Some(Self::report().suggest(at, message, Suggestion::new(at, replacement)))
+            } else {
+                None
+            }
+        }
+    }
+}
diff --git a/lib/src/make.rs b/lib/src/make.rs
index 217ba12..44adae6 100644
--- a/lib/src/make.rs
+++ b/lib/src/make.rs
@@ -24,6 +24,10 @@ pub fn parenthesize(node: &SyntaxNode) -> types::Paren {
     ast_from_text(&format!("({})", node))
 }
 
+pub fn quote(node: &SyntaxNode) -> types::Str {
+    ast_from_text(&format!("\"{}\"", node))
+}
+
 pub fn unary_not(node: &SyntaxNode) -> types::UnaryOp {
     ast_from_text(&format!("!{}", node))
 }
-- 
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