rewrite some installers for broader cross-platform support (#85)

- Remove all usage of zx in favour of native Lua (via libuv)
- Introduce new set of `std` installers

The following servers will have to be reinstalled due to this change:
1. clangd
2. solargraph
3. sumneko_lua
4. tailwindcss

1 files changed, 22 insertions, 5 deletions

diff --git a/lua/nvim-lsp-installer/servers/omnisharp/init.lua b/lua/nvim-lsp-installer/servers/omnisharp/init.lua
index 825ba811..4bb2a7ec 100644
--- a/lua/nvim-lsp-installer/servers/omnisharp/init.lua
+++ b/lua/nvim-lsp-installer/servers/omnisharp/init.lua
@@ -1,17 +1,34 @@
 local server = require "nvim-lsp-installer.server"
-local installers = require "nvim-lsp-installer.installers"
 local platform = require "nvim-lsp-installer.platform"
 local path = require "nvim-lsp-installer.path"
-local zx = require "nvim-lsp-installer.installers.zx"
+local Data = require "nvim-lsp-installer.data"
+local std = require "nvim-lsp-installer.installers.std"
 
 local root_dir = server.get_server_root_path "omnisharp"
 
+local VERSION = "v1.37.15"
+
+local target = Data.coalesce(
+    Data.when(platform.is_mac, "omnisharp-osx.zip"),
+    Data.when(platform.is_unix and platform.arch == "x64", "omnisharp-linux-x64.zip"),
+    Data.when(
+        platform.is_win,
+        Data.coalesce(
+            Data.when(platform.arch == "x64", "omnisharp-win-x64.zip"),
+            Data.when(platform.arch == "arm64", "omnisharp-win-arm64.zip")
+        )
+    )
+)
+
 return server.Server:new {
     name = "omnisharp",
     root_dir = root_dir,
-    installer = installers.when {
-        unix = zx.file "./install.mjs",
-        win = zx.file "./install.win.mjs",
+    installer = {
+        std.unzip_remote(
+            ("https://github.com/OmniSharp/omnisharp-roslyn/releases/download/%s/%s"):format(VERSION, target),
+            "omnisharp"
+        ),
+        std.chmod("+x", { "omnisharp/run" }),
     },
     default_options = {
         cmd = {