Allow configuring lsp server list

cmd/micro/micro.go

@@ -253,6 +253,11 @@ func main() {
 		screen.TermMessage(err)
 	}
 
+	err = lsp.Init()
+	if err != nil {
+		screen.TermMessage(err)
+	}
+
 	// flag options
 	for k, v := range optionFlags {
 		if *v != "" {

internal/lsp/install.go

@@ -3,10 +3,13 @@ package lsp
 import (
 	"errors"
 	"io"
-	"log"
+	"io/ioutil"
+	"os"
 	"os/exec"
+	"path/filepath"
 	"strings"
 
+	"github.com/zyedidia/micro/v2/internal/config"
 	"gopkg.in/yaml.v2"
 )
 
@@ -32,12 +35,23 @@ func GetLanguage(lang string) (Language, bool) {
 	return Language{}, false
 }
 
-func init() {
+func Init() error {
+	var servers []byte
 	var err error
-	conf, err = LoadConfig([]byte(servers))
-	if err != nil {
-		log.Println("[micro-lsp]", err)
+
+	filename := filepath.Join(config.ConfigDir, "lsp.yaml")
+	if _, e := os.Stat(filename); e == nil {
+		servers, err = ioutil.ReadFile(filename)
+		if err != nil {
+			servers = servers_internal
+		}
+	} else {
+		err = ioutil.WriteFile(filename, servers_internal, 0644)
+		servers = servers_internal
 	}
+
+	conf, err = LoadConfig(servers)
+	return err
 }
 
 func LoadConfig(data []byte) (*Config, error) {

internal/lsp/servers_yaml.go

@@ -1,6 +1,6 @@
 package lsp
 
-var servers = `language:
+var servers_internal = []byte(`language:
   rust:
     command: rls
     install: [["rustup", "update"], ["rustup", "component", "add", "rls", "rust-analysis", "rust-src"]]
@@ -64,4 +64,4 @@ var servers = `language:
     install: [["cargo", "install", "svls"]]
   d:
     command: serve-d
-`
+`)