migrate python filetype conf to lua (#470)

Author: jdhao

after/ftplugin/python.lua

@@ -0,0 +1,67 @@
+local utils = require("utils")
+local opt = vim.opt
+
+opt.wrap = false
+opt.sidescroll = 5
+opt.sidescrolloff = 2
+opt.colorcolumn = "100"
+
+opt.tabstop = 4 -- Number of visual spaces per TAB
+opt.softtabstop = 4 -- Number of spaces in tab when editing
+opt.shiftwidth = 4 -- Number of spaces to use for autoindent
+opt.expandtab = true -- Expand tab to spaces so that tabs are spaces
+
+local get_proj_root = function()
+  local project_marker = { ".git", "pyproject.toml" }
+  local project_root = vim.fs.root(0, project_marker)
+
+  return project_root
+end
+
+local get_py_env = function()
+  local project_root = get_proj_root()
+
+  local venv_name = utils.get_virtual_env()
+
+  if venv_name ~= "" then
+    return "plain_venv"
+  end
+
+  -- check if this is uv-managed project
+  local uv_lock_path = vim.fs.joinpath(project_root, "uv.lock")
+  if vim.fn.filereadable(uv_lock_path) == 1 then
+    return "uv"
+  end
+
+  return ""
+end
+
+local py_env = get_py_env()
+
+if vim.fn.exists(":AsyncRun") == 2 then
+  local py_cmd = "python"
+
+  if py_env == "uv" then
+    py_cmd = "uv run python"
+  end
+
+  local rhs = string.format(":<C-U>AsyncRun %s -u %%<CR>", py_cmd)
+
+  vim.keymap.set("n", "<F9>", rhs, {
+    buffer = true,
+    silent = true,
+  })
+end
+
+-- format current file
+
+local py_fmt_cmd = "!black"
+if py_env == "uv" then
+  py_fmt_cmd = "!uv run black"
+end
+
+local rhs = string.format("<cmd>silent %s %%<CR>", py_fmt_cmd)
+vim.keymap.set("n", "<space>f", rhs, {
+  buffer = true,
+  silent = true,
+})