From 5b87c6feb3e4a2fcc30ad94125be3dcd4e554754 Mon Sep 17 00:00:00 2001
From: Akshay <nerdy@peppe.rs>
Date: Tue, 2 Nov 2021 13:18:36 +0530
Subject: new lint: unquoted_uri

---
 flake.nix                     |  1 +
 lib/src/lints.rs              |  1 +
 lib/src/lints/unquoted_uri.rs | 63 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 65 insertions(+)
 create mode 100644 lib/src/lints/unquoted_uri.rs

diff --git a/flake.nix b/flake.nix
index 3536770..3b9d011 100644
--- a/flake.nix
+++ b/flake.nix
@@ -98,6 +98,7 @@
         mkShell rec {
           nativeBuildInputs = [
             cargo-watch
+            rust-analyzer
             toolchain
           ];
           RUST_LOG = "info";
diff --git a/lib/src/lints.rs b/lib/src/lints.rs
index 09cd77c..44d5922 100644
--- a/lib/src/lints.rs
+++ b/lib/src/lints.rs
@@ -12,4 +12,5 @@ lint_map! {
     unquoted_splice,
     empty_pattern,
     redundant_pattern_bind,
+    unquoted_uri,
 }
diff --git a/lib/src/lints/unquoted_uri.rs b/lib/src/lints/unquoted_uri.rs
new file mode 100644
index 0000000..b111f78
--- /dev/null
+++ b/lib/src/lints/unquoted_uri.rs
@@ -0,0 +1,63 @@
+use crate::{make, Metadata, Report, Rule, Suggestion};
+
+use if_chain::if_chain;
+use macros::lint;
+use rnix::{types::TypedNode, NodeOrToken, SyntaxElement, SyntaxKind};
+
+/// ## What it does
+/// Checks for URI expressions that are not quoted.
+///
+/// ## Why is this bad?
+/// The Nix language has a special syntax for URLs even though quoted
+/// strings can also be used to represent them. Unlike paths, URLs do
+/// not have any special properties in the Nix expression language
+/// that would make the difference useful. Moreover, using variable
+/// expansion in URLs requires some URLs to be quoted strings anyway.
+/// So the most consistent approach is to always use quoted strings to
+/// represent URLs. Additionally, a semicolon immediately after the
+/// URL can be mistaken for a part of URL by language-agnostic tools
+/// such as terminal emulators.
+///
+/// See RFC 00045 [1] for more.
+///
+/// [1]: https://github.com/NixOS/rfcs/blob/master/rfcs/0045-deprecate-url-syntax.md
+///
+/// ## Example
+///
+/// ```nix
+/// inputs = {
+///   gitignore.url = github:hercules-ci/gitignore.nix;
+/// }
+/// ```
+///
+/// Quote the URI expression:
+///
+/// ```nix
+/// inputs = {
+///   gitignore.url = "github:hercules-ci/gitignore.nix";
+/// }
+/// ```
+#[lint(
+    name = "unquoted uri",
+    note = "Found unquoted URI expression",
+    code = 12,
+    match_with = SyntaxKind::TOKEN_URI
+)]
+struct UnquotedUri;
+
+impl Rule for UnquotedUri {
+    fn validate(&self, node: &SyntaxElement) -> Option<Report> {
+        if_chain! {
+            if let NodeOrToken::Token(token) = node;
+            then {
+                let parent_node = token.parent();
+                let at = token.text_range();
+                let replacement = make::quote(&parent_node).node().clone();
+                let message = "Consider quoting this URI expression";
+                Some(self.report().suggest(at, message, Suggestion::new(at, replacement)))
+            } else {
+                None
+            }
+        }
+    }
+}
-- 
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