use crate::mason::install::{resolve_cached_program, resolve_or_install_program};
use crate::mason::link::{is_command_runnable, rewrite_program};
use crate::mason::registry::MasonRegistry;
use crate::runtime_state::{RuntimeState, default_runtime_state_root};
use crate::suggest::SuggestedLanguage;
pub fn resolve_detect_suggestions(
suggestions: &[SuggestedLanguage],
download: bool,
) -> Result<Vec<SuggestedLanguage>, String> {
let state = default_runtime_state_root().ok().map(RuntimeState::new);
let cached_registry = state.as_ref().and_then(MasonRegistry::load_cached);
let mut install_registry = None;
let mut resolved = Vec::new();
let mut errors = Vec::new();
for suggestion in suggestions {
if let Some(suggestion) = resolve_suggestion_from_path_or_cache(
suggestion,
state.as_ref(),
cached_registry.as_ref(),
)? {
resolved.push(suggestion);
continue;
}
if !download {
continue;
}
match install_suggestion(suggestion, state.as_ref(), &mut install_registry) {
Ok(suggestion) => resolved.push(suggestion),
Err(error) => errors.push(error),
}
}
if !resolved.is_empty() {
for error in errors {
eprintln!("warning: {error}");
}
return Ok(resolved);
}
if errors.len() == 1 {
Err(errors.remove(0))
} else if errors.is_empty() {
Ok(Vec::new())
} else {
Err(errors.join("\n"))
}
}
fn resolve_suggestion_from_path_or_cache(
suggestion: &SuggestedLanguage,
state: Option<&RuntimeState>,
registry: Option<&MasonRegistry>,
) -> Result<Option<SuggestedLanguage>, String> {
let Some(program) = suggestion.command.first() else {
return Err(format!(
"selected LSP server {} has an empty command",
suggestion.server
));
};
if is_command_runnable(program) {
return Ok(Some(suggestion.clone()));
}
if program.contains(std::path::MAIN_SEPARATOR) {
return Ok(None);
}
let (Some(state), Some(registry)) = (state, registry) else {
return Ok(None);
};
let Some(package) =
registry.package_for_detected(&suggestion.config_id, &suggestion.server, program)
else {
return Ok(None);
};
let Ok(Some(executable_path)) = resolve_cached_program(state, package, program) else {
return Ok(None);
};
Ok(Some(rewrite_program(suggestion, &executable_path)))
}
fn install_suggestion(
suggestion: &SuggestedLanguage,
state: Option<&RuntimeState>,
registry: &mut Option<MasonRegistry>,
) -> Result<SuggestedLanguage, String> {
let Some(program) = suggestion.command.first() else {
return Err(format!(
"selected LSP server {} has an empty command",
suggestion.server
));
};
if program.contains(std::path::MAIN_SEPARATOR) {
return Err(format!(
"configured LSP server executable `{program}` was not found"
));
}
let state = state.ok_or_else(|| {
"cannot install LSP servers automatically because $HOME is not set".to_string()
})?;
let registry = registry.get_or_insert(MasonRegistry::load(state)?);
let package = registry
.package_for_detected(&suggestion.config_id, &suggestion.server, program)
.ok_or_else(|| {
format!(
"no Mason install recipe is available for detected server {}",
suggestion.server
)
})?;
let executable_path = resolve_or_install_program(state, package, program)?;
Ok(rewrite_program(suggestion, &executable_path))
}
#[cfg(test)]
mod tests {
use super::resolve_detect_suggestions;
use crate::test_support::{
TestDir, env_var, jdtls_package, make_executable, pyright_package, runtime_state_in_home,
suggested_language, with_env_vars, write_registry,
};
use std::fs;
#[cfg(unix)]
#[test]
fn prefers_cached_direct_binary_when_path_misses() {
let dir = TestDir::new("mason-resolve");
let home = dir.path().join("home");
let state = runtime_state_in_home(&home);
state.ensure_dirs().expect("state dirs should be created");
write_registry(&state, &[pyright_package()]);
let cached = state
.package_dir("pyright")
.join("node_modules/.bin/pyright-langserver");
fs::create_dir_all(cached.parent().expect("parent should exist"))
.expect("parent dirs should be created");
fs::write(&cached, b"stub\n").expect("cached binary should be written");
make_executable(&cached);
let resolved = with_env_vars(
&[env_var("HOME", &home), env_var("PATH", "/nonexistent")],
|| {
resolve_detect_suggestions(
&[suggested_language(
"pyright-langserver",
"pyright",
"pyright",
"python",
)],
false,
)
.expect("resolution should succeed")
},
);
assert_eq!(resolved.len(), 1);
assert_eq!(resolved[0].command[0], cached.display().to_string());
}
#[cfg(unix)]
#[test]
fn prefers_cached_wrapper_when_path_misses() {
let dir = TestDir::new("mason-resolve");
let home = dir.path().join("home");
let state = runtime_state_in_home(&home);
state.ensure_dirs().expect("state dirs should be created");
write_registry(&state, &[jdtls_package()]);
let target = state.package_dir("jdtls").join("bin/jdtls");
fs::create_dir_all(target.parent().expect("parent should exist"))
.expect("parent dirs should be created");
fs::write(&target, b"print('ok')\n").expect("target should be written");
let launcher = state.bin_dir().join("jdtls");
fs::write(&launcher, b"stub\n").expect("launcher should be written");
make_executable(&launcher);
let runtime_dir = dir.path().join("bin");
fs::create_dir_all(&runtime_dir).expect("runtime dir should be created");
let python = runtime_dir.join("python3");
fs::write(&python, b"stub\n").expect("runtime should be written");
make_executable(&python);
let resolved = with_env_vars(
&[
env_var("HOME", &home),
env_var("PATH", runtime_dir.display().to_string()),
],
|| {
resolve_detect_suggestions(
&[suggested_language("jdtls", "jdtls", "jdtls", "python")],
false,
)
.expect("resolution should succeed")
},
);
assert_eq!(resolved.len(), 1);
assert_eq!(resolved[0].command[0], launcher.display().to_string());
}
#[cfg(unix)]
#[test]
fn skips_server_when_not_in_path_or_cache() {
let dir = TestDir::new("mason-resolve");
let home = dir.path().join("home");
fs::create_dir_all(&home).expect("home dir should be created");
let resolved = with_env_vars(
&[env_var("HOME", &home), env_var("PATH", "/nonexistent")],
|| {
resolve_detect_suggestions(
&[suggested_language(
"pyright-langserver",
"pyright",
"pyright",
"python",
)],
false,
)
.expect("resolution should succeed")
},
);
assert!(resolved.is_empty());
}
#[cfg(unix)]
#[test]
fn treats_corrupted_cache_as_missing() {
let dir = TestDir::new("mason-resolve");
let home = dir.path().join("home");
let state = runtime_state_in_home(&home);
state.ensure_dirs().expect("state dirs should be created");
fs::write(state.registry_json_path(), b"not json")
.expect("corrupted registry should be written");
let resolved = with_env_vars(
&[env_var("HOME", &home), env_var("PATH", "/nonexistent")],
|| {
resolve_detect_suggestions(
&[suggested_language(
"pyright-langserver",
"pyright",
"pyright",
"python",
)],
false,
)
.expect("resolution should succeed")
},
);
assert!(resolved.is_empty());
}
}