Files
llmx/codex-rs/core/src/tool_apply_patch.rs
Michael Bolin 639a6fd2f3 chore: upgrade to Rust 1.90 (#4124)
Inspired by Dependabot's attempt to do this:
https://github.com/openai/codex/pull/4029

The new version of Clippy found some unused structs that are removed in
this PR.

Though nothing stood out to me in the Release Notes in terms of things
we should start to take advantage of:
https://blog.rust-lang.org/2025/09/18/Rust-1.90.0/.
2025-09-24 08:32:00 -07:00

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use serde::Deserialize;
use serde::Serialize;
use std::collections::BTreeMap;
use crate::openai_tools::FreeformTool;
use crate::openai_tools::FreeformToolFormat;
use crate::openai_tools::JsonSchema;
use crate::openai_tools::OpenAiTool;
use crate::openai_tools::ResponsesApiTool;
const APPLY_PATCH_LARK_GRAMMAR: &str = include_str!("tool_apply_patch.lark");
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq, Hash)]
#[serde(rename_all = "snake_case")]
pub enum ApplyPatchToolType {
Freeform,
Function,
}
/// Returns a custom tool that can be used to edit files. Well-suited for GPT-5 models
/// https://platform.openai.com/docs/guides/function-calling#custom-tools
pub(crate) fn create_apply_patch_freeform_tool() -> OpenAiTool {
OpenAiTool::Freeform(FreeformTool {
name: "apply_patch".to_string(),
description: "Use the `apply_patch` tool to edit files".to_string(),
format: FreeformToolFormat {
r#type: "grammar".to_string(),
syntax: "lark".to_string(),
definition: APPLY_PATCH_LARK_GRAMMAR.to_string(),
},
})
}
/// Returns a json tool that can be used to edit files. Should only be used with gpt-oss models
pub(crate) fn create_apply_patch_json_tool() -> OpenAiTool {
let mut properties = BTreeMap::new();
properties.insert(
"input".to_string(),
JsonSchema::String {
description: Some(r#"The entire contents of the apply_patch command"#.to_string()),
},
);
OpenAiTool::Function(ResponsesApiTool {
name: "apply_patch".to_string(),
description: r#"Use the `apply_patch` tool to edit files.
Your patch language is a strippeddown, fileoriented diff format designed to be easy to parse and safe to apply. You can think of it as a highlevel envelope:
*** Begin Patch
[ one or more file sections ]
*** End Patch
Within that envelope, you get a sequence of file operations.
You MUST include a header to specify the action you are taking.
Each operation starts with one of three headers:
*** Add File: <path> - create a new file. Every following line is a + line (the initial contents).
*** Delete File: <path> - remove an existing file. Nothing follows.
*** Update File: <path> - patch an existing file in place (optionally with a rename).
May be immediately followed by *** Move to: <new path> if you want to rename the file.
Then one or more “hunks”, each introduced by @@ (optionally followed by a hunk header).
Within a hunk each line starts with:
For instructions on [context_before] and [context_after]:
- By default, show 3 lines of code immediately above and 3 lines immediately below each change. If a change is within 3 lines of a previous change, do NOT duplicate the first changes [context_after] lines in the second changes [context_before] lines.
- If 3 lines of context is insufficient to uniquely identify the snippet of code within the file, use the @@ operator to indicate the class or function to which the snippet belongs. For instance, we might have:
@@ class BaseClass
[3 lines of pre-context]
- [old_code]
+ [new_code]
[3 lines of post-context]
- If a code block is repeated so many times in a class or function such that even a single `@@` statement and 3 lines of context cannot uniquely identify the snippet of code, you can use multiple `@@` statements to jump to the right context. For instance:
@@ class BaseClass
@@ def method():
[3 lines of pre-context]
- [old_code]
+ [new_code]
[3 lines of post-context]
The full grammar definition is below:
Patch := Begin { FileOp } End
Begin := "*** Begin Patch" NEWLINE
End := "*** End Patch" NEWLINE
FileOp := AddFile | DeleteFile | UpdateFile
AddFile := "*** Add File: " path NEWLINE { "+" line NEWLINE }
DeleteFile := "*** Delete File: " path NEWLINE
UpdateFile := "*** Update File: " path NEWLINE [ MoveTo ] { Hunk }
MoveTo := "*** Move to: " newPath NEWLINE
Hunk := "@@" [ header ] NEWLINE { HunkLine } [ "*** End of File" NEWLINE ]
HunkLine := (" " | "-" | "+") text NEWLINE
A full patch can combine several operations:
*** Begin Patch
*** Add File: hello.txt
+Hello world
*** Update File: src/app.py
*** Move to: src/main.py
@@ def greet():
-print("Hi")
+print("Hello, world!")
*** Delete File: obsolete.txt
*** End Patch
It is important to remember:
- You must include a header with your intended action (Add/Delete/Update)
- You must prefix new lines with `+` even when creating a new file
- File references can only be relative, NEVER ABSOLUTE.
"#
.to_string(),
strict: false,
parameters: JsonSchema::Object {
properties,
required: Some(vec!["input".to_string()]),
additional_properties: Some(false),
},
})
}