fix: improve compiler detection and prevent crash when missing (fix #154) (#175)

Author: wenxuanjun

src/analyzer/IndexingManager.v

@@ -15,6 +15,11 @@ pub fn IndexingManager.new() &IndexingManager {
 	}
 }
 
+pub fn (mut a IndexingManager) setup_empty_indexes() {
+	a.stub_index = psi.new_stubs_index([])
+	stubs_index = a.stub_index
+}
+
 pub fn (mut a IndexingManager) setup_stub_indexes() {
 	mut sinks := a.all_sinks()
 	a.stub_index = psi.new_stubs_index(sinks)

src/project/flavors/SymlinkToolchainFlavor.v

@@ -5,7 +5,11 @@ import os
 pub struct SymlinkToolchainFlavor {}
 
 fn (s &SymlinkToolchainFlavor) get_home_page_candidates() []string {
-	symlink_path_candidates := ['/usr/local/bin/v', '${os.home_dir()}/.local/bin/v']
+	symlink_path_candidates := [
+		'/usr/bin/v',
+		'/usr/local/bin/v',
+		'${os.home_dir()}/.local/bin/v',
+	]
 
 	mut result := []string{}
 

src/server/general.v

@@ -97,6 +97,8 @@ pub fn (mut ls LanguageServer) initialize(params lsp.InitializeParams, mut wr Re
 
 pub fn (mut ls LanguageServer) initialized(mut wr ResponseWriter) {
 	loglib.info('-------- New session -------- ')
+	ls.indexing_mng.setup_empty_indexes()
+
 	if ls.paths.vexe == '' || ls.paths.vlib_root == '' {
 		ls.client.send_server_status(health: 'error', quiescent: true)
 		return