feat: Determine server info (#52)

Part of what's holding back Windows report support is that nvrh assumes
a bash/unix like environment.

Most of it isn't so bad, it expects `/tmp` to exist, but the main
command to start the remote neovim instance relies on a fairly
bash-compatiable shell, since it uses `$SHELL -i -c '...'`

This PR adds some groundwork for determining some server info (namely
the shell and temp directory), but it's a chicken an egg problem, since
it relies on starting the remote neovim instance before it can begin
doing that.

I _think_ there's maybe some path forward where we can just run `nvim -u
NONE --headless -listen :SOME_PORT`

- ports because they work on both Windows and Unix
- `-u NONE` because we're just going to run some lua

But this expects `nvim` to exist in the users `PATH`, which is why I've
been using `$SHELL -i` because ... guess who has two thumbs and `nvim`
isn't in my `PATH` until fully loading an interactive shell ...

Closes #49 
Closes #11

Author: mikew

script/test

@@ -5,7 +5,7 @@ WORKING_HOST="$1"
 
 fresh-nvrh() {
   NVRH_CLIENT_DEBUG=false \
-  NVRH_CLIENT_NVIM_CMD="nvim,-u,NONE" \
+  NVRH_CLIENT_NVIM_CMD="/home/linuxbrew/.linuxbrew/bin/nvim,-u,NONE" \
   env \
     -u NVRH_CLIENT_SSH_ARG \
     -u NVRH_CLIENT_SERVER_ENV \

src/bridge_files/lua/determine_server_info.lua

@@ -0,0 +1,94 @@
+-- https://github.com/neovim/neovim/blob/c12701d4e1404a67fef6da01a8a9d7e2d48d78d6/runtime/lua/uv/_meta.lua#L4297-L4301
+--- @class uv.os_uname.info
+--- @field sysname string
+--- @field release string
+--- @field version string
+--- @field machine string
+
+-- https://github.com/neovim/neovim/blob/c12701d4e1404a67fef6da01a8a9d7e2d48d78d6/runtime/lua/uv/_meta.lua#L4367-L4372
+--- @class uv.os_get_passwd.passwd
+--- @field username string
+--- @field uid integer?
+--- @field gid integer?
+--- @field shell string?
+--- @field homedir string
+
+---@type uv.os_uname.info
+local uname = vim.uv.os_uname()
+---@type uv.os_get_passwd.passwd
+local passwd = vim.uv.os_get_passwd()
+
+local function get_os()
+  local os = uname.sysname:lower()
+
+  if os == 'linux' then
+    return 'linux'
+  elseif os == 'darwin' then
+    return 'macos'
+  elseif os == 'windows_nt' then
+    return 'windows'
+  elseif os:match('^cygwin') or os:match('^mingw') or os:match('^msys') then
+    return 'windows'
+  else
+    return 'unknown'
+  end
+end
+
+local function get_arch()
+  local arch = uname.machine:lower()
+
+  if arch == 'x86_64' or arch == 'amd64' then
+    return 'amd64'
+  elseif arch == 'aarch64' or arch == 'arm64' then
+    return 'arm64'
+  elseif arch:match('^armv8') then
+    return 'arm64'
+  elseif arch:match('^armv7') or arch:match('^armv6') then
+    return 'arm'
+  elseif
+      arch == 'i386'
+      or arch == 'i486'
+      or arch == 'i586'
+      or arch == 'i686'
+      or arch == 'i786'
+      or arch == 'x86'
+  then
+    return '386'
+  elseif arch == 'ppc64le' then
+    return 'ppc64le'
+  elseif arch == 's390x' then
+    return 's390x'
+  else
+    return 'unknown'
+  end
+end
+
+local function get_shell_name()
+  local shell = (vim.env.SHELL or passwd.shell or ''):lower()
+  if shell:match('bash') then
+    return 'bash'
+  elseif shell:match('zsh') then
+    return 'zsh'
+  end
+
+  if vim.env.PSMODULEPATH then
+    return 'powershell'
+  end
+
+  if vim.env.COMSPEC and vim.env.PROMPT then
+    return 'cmd'
+  end
+
+  return 'unknown'
+end
+
+local server_info = {
+  os = get_os(),
+  arch = get_arch(),
+  username = passwd.username,
+  homedir = passwd.homedir,
+  tmpdir = vim.uv.os_tmpdir(),
+  shell_name = get_shell_name(),
+}
+
+return vim.json.encode(server_info)

src/bridge_files/lua/init_bridge.lua

@@ -0,0 +1,13 @@
+local session_id, channel_id, socket_path, browser_script_path, should_map_ports, nvrh_server_info =
+  ...
+
+local should_initialize = _G._nvrh == nil
+
+---vim.print("Preparing remote nvim", {
+---	session_id = session_id,
+---	channel_id = channel_id,
+---	socket_path = socket_path,
+---	browser_script_path = browser_script_path,
+---	should_map_ports = should_map_ports,
+---	should_initialize = should_initialize,
+---})

src/bridge_files/lua/init.lua src/bridge_files/lua/init_nvrh.luasrc/bridge_files/lua/init.lua renamed to src/bridge_files/lua/init_nvrh.lua

@@ -11,6 +11,9 @@ if should_initialize then
   _G._nvrh = {
     ---@type { [string]: boolean }
     mapped_ports = {},
+
+    ---@type NvrhServerInfo
+    server_info = vim.json.decode(nvrh_server_info),
   }
 
   function _G._nvrh.get_nvrh_channels()

src/bridge_files/lua/setup_browser_script.lua

@@ -4,5 +4,8 @@ if should_initialize then
 ]]
 
   vim.fn.writefile(vim.fn.split(script_contents, '\n'), browser_script_path)
-  os.execute('chmod +x ' .. browser_script_path)
+
+  if _G._nvrh.server_info.os ~= 'windows' then
+    os.execute('chmod +x ' .. browser_script_path)
+  end
 end

src/bridge_files/lua/types/nvrh.lua

@@ -1,10 +1,19 @@
 ---@meta
 
+---@class NvrhServerInfo
+---@field os string The operating system, e.g., "linux", "macos", "windows"
+---@field arch string The architecture, e.g., "amd64", "arm64", "386"
+---@field username string The username of the user
+---@field homedir string The home directory of the user
+---@field tmpdir string The temporary directory path
+---@field shell_name string The shell name, e.g., "bash", "zsh", "cmd", "powershell"
+
 --- These are bridged from the Go code
 session_id = ''
 channel_id = -1
 socket_path = ''
 browser_script_path = ''
 should_map_ports = false
+nvrh_server_info = ''
 
 should_initialize = false

src/bridge_files/main.go

@@ -5,7 +5,7 @@ import (
 	"log/slog"
 )
 
-//go:embed lua/*.lua shell/*
+//go:embed lua/* shell/*
 var luaFolder embed.FS
 
 func ReadFileWithoutError(filename string) string {

src/bridge_files/shell/nvrh-browser.bat

@@ -0,0 +1,4 @@
+@echo off
+set SOCKET_PATH=%s
+
+start "" nvim --server "%%SOCKET_PATH%%" --remote-expr "v:lua._nvrh.open_url('%%1')" >nul 2>&1