Avoid updating incorrect dependencies for sorted uv add (#6939)

## Summary

The indexes stored in the edits is wrong now that we add dependencies
out-of-order.

Closes https://github.com/astral-sh/uv/issues/6933.

crates/uv-workspace/src/pyproject.rs

@@ -486,7 +486,7 @@ impl Source {
 }
 
 /// The type of a dependency in a `pyproject.toml`.
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, PartialEq, Eq)]
 pub enum DependencyType {
     /// A dependency in `project.dependencies`.
     Production,

crates/uv-workspace/src/pyproject_mut.rs

@@ -48,6 +48,14 @@ pub enum ArrayEdit {
     Add(usize),
 }
 
+impl ArrayEdit {
+    pub fn index(&self) -> usize {
+        match self {
+            Self::Update(i) | Self::Add(i) => *i,
+        }
+    }
+}
+
 /// Specifies whether dependencies are added to a script file or a `pyproject.toml` file.
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
 pub enum DependencyTarget {

crates/uv/src/commands/project/add.rs

@@ -328,7 +328,7 @@ pub(crate) async fn add(
             DependencyTarget::PyProjectToml,
         ),
     }?;
-    let mut edits = Vec::with_capacity(requirements.len());
+    let mut edits = Vec::<DependencyEdit>::with_capacity(requirements.len());
     for mut requirement in requirements {
         // Add the specified extras.
         requirement.extras.extend(extras.iter().cloned());
@@ -407,6 +407,26 @@ pub(crate) async fn add(
         };
 
         // Keep track of the exact location of the edit.
+        let index = edit.index();
+
+        // If the edit was inserted before the end of the list, update the existing edits.
+        for edit in &mut edits {
+            if *edit.dependency_type == dependency_type {
+                match &mut edit.edit {
+                    ArrayEdit::Add(existing) => {
+                        if *existing >= index {
+                            *existing += 1;
+                        }
+                    }
+                    ArrayEdit::Update(existing) => {
+                        if *existing >= index {
+                            *existing += 1;
+                        }
+                    }
+                }
+            }
+        }
+
         edits.push(DependencyEdit {
             dependency_type: &dependency_type,
             requirement,

crates/uv/tests/edit.rs

@@ -4411,8 +4411,8 @@ fn fail_to_add_revert_project() -> Result<()> {
     Ok(())
 }
 
-/// Ensure that the added dependencies are sorted
-/// if the dependency list was already sorted prior to adding the new one.
+/// Ensure that the added dependencies are sorted if the dependency list was already sorted prior
+/// to the operation.
 #[test]
 fn sorted_dependencies() -> Result<()> {
     let context = TestContext::new("3.12");
@@ -4426,19 +4426,31 @@ fn sorted_dependencies() -> Result<()> {
     requires-python = ">=3.12"
     dependencies = [
         "CacheControl[filecache]>=0.14,<0.15",
-        "mwparserfromhell",
-        "pywikibot",
-        "sentry-sdk",
-        "yarl",
+        "iniconfig",
     ]
     "#})?;
 
-    uv_snapshot!(context.filters(), context.add(&["pydantic"]).arg("--frozen"), @r###"
+    uv_snapshot!(context.filters(), context.add(&["typing-extensions", "anyio"]), @r###"
     success: true
     exit_code: 0
     ----- stdout -----
 
     ----- stderr -----
+    Resolved 13 packages in [TIME]
+    Prepared 12 packages in [TIME]
+    Installed 12 packages in [TIME]
+     + anyio==4.3.0
+     + cachecontrol==0.14.0
+     + certifi==2024.2.2
+     + charset-normalizer==3.3.2
+     + filelock==3.13.1
+     + idna==3.6
+     + iniconfig==2.0.0
+     + msgpack==1.0.8
+     + requests==2.31.0
+     + sniffio==1.3.1
+     + typing-extensions==4.10.0
+     + urllib3==2.2.1
     "###);
 
     let pyproject_toml = fs_err::read_to_string(context.temp_dir.join("pyproject.toml"))?;
@@ -4455,11 +4467,9 @@ fn sorted_dependencies() -> Result<()> {
         requires-python = ">=3.12"
         dependencies = [
             "CacheControl[filecache]>=0.14,<0.15",
-            "mwparserfromhell",
-            "pydantic",
-            "pywikibot",
-            "sentry-sdk",
-            "yarl",
+            "anyio>=4.3.0",
+            "iniconfig",
+            "typing-extensions>=4.10.0",
         ]
         "###
         );