1//! Provides support for language toolchains.
 2//!
 3//! A language can have associated toolchains,
 4//! which is a set of tools used to interact with the projects written in said language.
 5//! For example, a Python project can have an associated virtual environment; a Rust project can have a toolchain override.
 6
 7use std::{
 8    path::{Path, PathBuf},
 9    sync::Arc,
10};
11
12use async_trait::async_trait;
13use collections::HashMap;
14use gpui::{AsyncApp, SharedString};
15use settings::WorktreeId;
16
17use crate::LanguageName;
18
19/// Represents a single toolchain.
20#[derive(Clone, Debug)]
21pub struct Toolchain {
22    /// User-facing label
23    pub name: SharedString,
24    pub path: SharedString,
25    pub language_name: LanguageName,
26    /// Full toolchain data (including language-specific details)
27    pub as_json: serde_json::Value,
28}
29
30impl PartialEq for Toolchain {
31    fn eq(&self, other: &Self) -> bool {
32        // Do not use as_json for comparisons; it shouldn't impact equality, as it's not user-surfaced.
33        // Thus, there could be multiple entries that look the same in the UI.
34        (&self.name, &self.path, &self.language_name).eq(&(
35            &other.name,
36            &other.path,
37            &other.language_name,
38        ))
39    }
40}
41
42#[async_trait]
43pub trait ToolchainLister: Send + Sync {
44    async fn list(
45        &self,
46        worktree_root: PathBuf,
47        project_env: Option<HashMap<String, String>>,
48    ) -> ToolchainList;
49    // Returns a term which we should use in UI to refer to a toolchain.
50    fn term(&self) -> SharedString;
51}
52
53#[async_trait(?Send)]
54pub trait LanguageToolchainStore: Send + Sync + 'static {
55    async fn active_toolchain(
56        self: Arc<Self>,
57        worktree_id: WorktreeId,
58        relative_path: Arc<Path>,
59        language_name: LanguageName,
60        cx: &mut AsyncApp,
61    ) -> Option<Toolchain>;
62}
63
64type DefaultIndex = usize;
65#[derive(Default, Clone)]
66pub struct ToolchainList {
67    pub toolchains: Vec<Toolchain>,
68    pub default: Option<DefaultIndex>,
69    pub groups: Box<[(usize, SharedString)]>,
70}
71
72impl ToolchainList {
73    pub fn toolchains(&self) -> &[Toolchain] {
74        &self.toolchains
75    }
76    pub fn default_toolchain(&self) -> Option<Toolchain> {
77        self.default.and_then(|ix| self.toolchains.get(ix)).cloned()
78    }
79    pub fn group_for_index(&self, index: usize) -> Option<(usize, SharedString)> {
80        if index >= self.toolchains.len() {
81            return None;
82        }
83        let first_equal_or_greater = self
84            .groups
85            .partition_point(|(group_lower_bound, _)| group_lower_bound <= &index);
86        self.groups
87            .get(first_equal_or_greater.checked_sub(1)?)
88            .cloned()
89    }
90}