add Lualine component (#279)

Author: BingCoke

README.md

@@ -213,6 +213,35 @@ require("telescope").extensions.rest.select_env()
 - env_pattern: For env file pattern
 - env_edit_command: For env file edit command
 
+## Lualine
+
+We also have lualine component to get what env file you select!
+And dont't worry, it will only show up under http files.
+
+```lua
+-- Juse add a component in your lualine config
+{
+  sections = {
+    lualine_x = {
+      "rest"
+    }
+  }
+}
+
+-- To custom icon and color
+{
+  sections = {
+    lualine_x = {
+      {
+        "rest",
+        icon = "",
+        fg = "#428890"
+      }
+    }
+  }
+}
+```
+
 ## Contribute
 
 1. Fork it (https://github.com/rest-nvim/rest.nvim/fork)

lua/lualine/components/rest.lua

@@ -0,0 +1,31 @@
+local lualine_require = require("lualine_require")
+local M = lualine_require.require("lualine.component"):extend()
+local config = require("rest-nvim.config")
+
+local default_options = {
+    fg = "#428890",
+    icon = "",
+}
+
+function M:init(options)
+  M.super.init(self, options)
+  self.options = vim.tbl_deep_extend("keep", self.options or {}, default_options)
+  self.icon = self.options.icon
+
+  self.highlight_color = self:create_hl({ fg = self.options.fg }, "Rest")
+end
+
+function M:apply_icon()
+  local default_highlight = self:get_default_hl()
+  self.status = self:format_hl(self.highlight_color) .. self.icon .. " " .. default_highlight .. self.status
+end
+
+function M.update_status()
+  local current_filetype = vim.bo.filetype
+  if current_filetype == "http" then
+    return config.get("env_file")
+  end
+  return ""
+end
+
+return M