1use std::path::Path;
 2use std::sync::Arc;
 3
 4use anyhow::{anyhow, Result};
 5use assistant_tool::{ActionLog, Tool};
 6use gpui::{App, Entity, Task};
 7use language_model::LanguageModelRequestMessage;
 8use project::Project;
 9use schemars::JsonSchema;
10use serde::{Deserialize, Serialize};
11
12#[derive(Debug, Serialize, Deserialize, JsonSchema)]
13pub struct ReadFileToolInput {
14    /// The relative path of the file to read.
15    ///
16    /// This path should never be absolute, and the first component
17    /// of the path should always be a root directory in a project.
18    ///
19    /// <example>
20    /// If the project has the following root directories:
21    ///
22    /// - directory1
23    /// - directory2
24    ///
25    /// If you wanna access `file.txt` in `directory1`, you should use the path `directory1/file.txt`.
26    /// If you wanna access `file.txt` in `directory2`, you should use the path `directory2/file.txt`.
27    /// </example>
28    pub path: Arc<Path>,
29}
30
31pub struct ReadFileTool;
32
33impl Tool for ReadFileTool {
34    fn name(&self) -> String {
35        "read-file".into()
36    }
37
38    fn description(&self) -> String {
39        include_str!("./read_file_tool/description.md").into()
40    }
41
42    fn input_schema(&self) -> serde_json::Value {
43        let schema = schemars::schema_for!(ReadFileToolInput);
44        serde_json::to_value(&schema).unwrap()
45    }
46
47    fn run(
48        self: Arc<Self>,
49        input: serde_json::Value,
50        _messages: &[LanguageModelRequestMessage],
51        project: Entity<Project>,
52        _action_log: Entity<ActionLog>,
53        cx: &mut App,
54    ) -> Task<Result<String>> {
55        let input = match serde_json::from_value::<ReadFileToolInput>(input) {
56            Ok(input) => input,
57            Err(err) => return Task::ready(Err(anyhow!(err))),
58        };
59
60        let Some(project_path) = project.read(cx).find_project_path(&input.path, cx) else {
61            return Task::ready(Err(anyhow!("Path not found in project")));
62        };
63        cx.spawn(|cx| async move {
64            let buffer = cx
65                .update(|cx| {
66                    project.update(cx, |project, cx| project.open_buffer(project_path, cx))
67                })?
68                .await?;
69
70            buffer.read_with(&cx, |buffer, _cx| {
71                if buffer
72                    .file()
73                    .map_or(false, |file| file.disk_state().exists())
74                {
75                    Ok(buffer.text())
76                } else {
77                    Err(anyhow!("File does not exist"))
78                }
79            })?
80        })
81    }
82}