Mountain/ProcessManagement/NodeResolver/TryNvm.rs
1
2//! nvm lookup. `NVM_BIN` wins (set inside an nvm-sourced shell). Fallback
3//! walks `$NVM_DIR/versions/node` and picks the lexicographically largest
4//! version (rough proxy for "latest installed").
5
6use std::path::PathBuf;
7
8use crate::ProcessManagement::NodeResolver::{NodeExecutableName, NodeSource, ResolvedNode};
9
10pub fn Fn() -> Option<ResolvedNode::Struct> {
11 if let Ok(NvmBin) = std::env::var("NVM_BIN") {
12 let Candidate = PathBuf::from(NvmBin).join(NodeExecutableName::Fn());
13
14 if Candidate.exists() {
15 return Some(ResolvedNode::Struct { Path:Candidate, Source:NodeSource::Enum::Nvm });
16 }
17 }
18
19 let NvmDir = std::env::var("NVM_DIR").ok().or_else(|| {
20 std::env::var("HOME")
21 .ok()
22 .map(|H| PathBuf::from(H).join(".nvm").to_string_lossy().into_owned())
23 })?;
24
25 let VersionsDirectory = PathBuf::from(&NvmDir).join("versions").join("node");
26
27 let Entries = std::fs::read_dir(&VersionsDirectory).ok()?;
28
29 let mut BestCandidate:Option<PathBuf> = None;
30
31 for Entry in Entries.flatten() {
32 let NodePath = Entry.path().join("bin").join(NodeExecutableName::Fn());
33
34 if !NodePath.exists() {
35 continue;
36 }
37
38 BestCandidate = match BestCandidate {
39 Some(Existing) if Existing > NodePath => Some(Existing),
40
41 _ => Some(NodePath),
42 };
43 }
44
45 BestCandidate.map(|Path| ResolvedNode::Struct { Path, Source:NodeSource::Enum::Nvm })
46}