feat(python): add pyproject.toml dependencies support

lua/gx/handlers/pyproject_toml.lua

@@ -0,0 +1,129 @@
+---@type GxHandler
+local M = {
+  -- only package.json
+  name = "pyproject_toml",
+  filetype = { "toml" },
+  filename = "pyproject.toml",
+}
+
+function M.handle()
+  local node = vim.treesitter.get_node()
+  if not node then
+    return
+  end
+  if node:type() ~= "string" then
+    return
+  end
+  local dep_array = node:parent()
+  if not dep_array or dep_array:type() ~= "array" then
+    return
+  end
+  local pair = dep_array:parent()
+  if not pair or dep_array:parent():type() ~= "pair" then
+    return
+  end
+  local bare_key = dep_array:next_named_sibling()
+  if not bare_key then
+    bare_key = node:parent():prev_named_sibling()
+  end
+  if not bare_key then
+    return
+  end
+  local start_line, start_col, end_line, end_col = bare_key:range()
+  local line = vim.api.nvim_buf_get_lines(0, start_line, end_line + 1, false)[1]
+  local key = line:sub(start_col, end_col)
+  if not key then
+    return
+  end
+  local table = pair:parent()
+  if not table or table:type() ~= "table" then
+    return
+  end
+  for child, _ in table:iter_children() do
+    if child:named() then
+      if child:type() == "bare_key" then
+        bare_key = child
+      end
+    end
+  end
+  if not bare_key then
+    return
+  end
+  start_line, start_col, end_line, end_col = bare_key:range()
+  line = vim.api.nvim_buf_get_lines(0, start_line, end_line + 1, false)[1]
+  local table_key = line:sub(start_col + 1, end_col)
+  if not table_key then
+    return
+  end
+  if table_key == "project" then
+    if key ~= "dependencies" then
+      return
+    end
+  elseif table_key == "build-system" then
+    -- Handle PEP 518
+    if key ~= "requires" then
+      return
+    end
+  elseif table_key ~= "dependency-groups" or table_key ~= "project.optional-dependencies" then
+    return
+  end
+  start_line, start_col, end_line, end_col = node:range()
+  line = vim.api.nvim_buf_get_lines(0, start_line, end_line + 1, false)[1]
+  local package = line:sub(start_col + 2, end_col - 1) -- remove quotes
+  if not package then
+    return
+  end
+  -- deal with PEP 440 version ranges
+  local _, _, new = package:find("^(.+)<.+")
+  if new then
+    ---@type string
+    package = new
+  end
+  _, _, new = package:find("^(.+)%s*>.+")
+  if new then
+    ---@type string
+    package = new
+  end
+  _, _, new = package:find("^(.+)%s*<=.+")
+  if new then
+    ---@type string
+    package = new
+  end
+  _, _, new = package:find("^(.+)%s*>=.+")
+  if new then
+    ---@type string
+    package = new
+  end
+  _, _, new = package:find("^(.+)%s*~=.+")
+  if new then
+    ---@type string
+    package = new
+  end
+  _, _, new = package:find("^(.+)%s*!=.+")
+  if new then
+    ---@type string
+    package = new
+  end
+  _, _, new = package:find("^(.+)%s*==.+")
+  if new then
+    ---@type string
+    package = new
+  end
+  _, _, new = package:find("^(.+)%s*===.+")
+  if new then
+    ---@type string
+    package = new
+  end
+  -- trim leading and trailing whitespace
+  package = package:gsub("^%s*", "")
+  package = package:gsub("%s*$", "")
+
+  -- trim extras (PEP 508)
+  package = package:gsub("%[.+%]$", "")
+  if not package then
+    return
+  end
+  return "https://pypi.org/project/" .. package
+end
+
+return M