BREAKING CHANGE: Delta Pager + Large Refactor (#43)

BREAKING CHANGE: This MR addresses an underlying issue with the original implementation in regards to detecting line numbers for comments. 

As such, this is a major breaking change. The setup function signature has changed, please review the `README.md` for the new arguments. The delta pager has also been added as a dependency: https://github.com/dandavison/delta

There will be future work to implement a native solution for parsing changes and line numbers.

lua/gitlab/state.lua

@@ -1,18 +1,37 @@
-local M   = {}
+-- This module is responsible for holding and setting shared state between
+-- modules, such as keybinding data and other settings and configuration.
+-- This module is also responsible for ensuring that the state of the plugin
+-- is valid via dependencies
 
--- These are the default keymaps for the plugin
-M.keymaps = {
+local u                  = require("gitlab.utils")
+local M                  = {}
+
+-- These are the default settings for the plugin
+M.settings               = {
+  port = 21036,
+  log_path = (vim.fn.stdpath("cache") .. "/gitlab.nvim.log"),
   popup = {
     exit = "<Esc>",
     perform_action = "<leader>s",
   },
   discussion_tree = {
-    jump_to_location = "o",
+    toggle = "<leader>d",
+    jump_to_file = "o",
     edit_comment = "e",
     delete_comment = "dd",
-    reply_to_comment = "r",
+    reply = "r",
     toggle_node = "t",
-    toggle_resolved = "p"
+    toggle_resolved = "p",
+    relative = "editor",
+    position = "left",
+    size = "20%",
+    resolved = '✓',
+    unresolved = ''
+  },
+  review_pane = {
+    added_file = "",
+    modified_file = "",
+    removed_file = "",
   },
   dialogue = {
     focus_next = { "j", "<Down>", "<Tab>" },
@@ -20,9 +39,84 @@ M.keymaps = {
     close = { "<Esc>", "<C-c>" },
     submit = { "<CR>", "<Space>" },
   },
-  review = {
-    toggle = "<leader>glt"
-  }
+  go_server_running = false,
+  is_gitlab_project = false,
 }
 
+-- Merges user settings into the default settings, overriding them
+M.merge_settings         = function(args)
+  if args == nil then return end
+  M.settings = u.merge(M.settings, args)
+end
+
+M.print_settings         = function()
+  u.P(M.settings)
+end
+
+-- Merges `.gitlab.nvim` settings into the state module
+M.setPluginConfiguration = function()
+  local config_file_path = vim.fn.getcwd() .. "/.gitlab.nvim"
+  local config_file_content = u.read_file(config_file_path)
+  if config_file_content == nil then
+    return false
+  end
+
+  M.is_gitlab_project = true
+
+  local file = assert(io.open(config_file_path, "r"))
+  local properties = {}
+  for line in file:lines() do
+    for key, value in string.gmatch(line, "(.-)=(.-)$") do
+      properties[key] = value
+    end
+  end
+
+  M.settings.project_id = properties.project_id
+  M.settings.auth_token = properties.auth_token or os.getenv("GITLAB_TOKEN")
+  M.settings.gitlab_url = properties.gitlab_url or "https://gitlab.com"
+
+  if M.settings.auth_token == nil then
+    error("Missing authentication token for Gitlab")
+  end
+
+  if M.settings.project_id == nil then
+    error("Missing project ID in .gitlab.nvim file.")
+  end
+
+  if type(tonumber(M.settings.project_id)) ~= "number" then
+    error("The .gitlab.nvim project file's 'project_id' must be number")
+  end
+
+  return true
+end
+
+local function exit(popup)
+  popup:unmount()
+end
+
+-- These keymaps are buffer specific and are set dynamically when popups mount
+M.set_popup_keymaps = function(popup, action)
+  vim.keymap.set('n', M.settings.popup.exit, function() exit(popup) end, { buffer = true })
+  if action ~= nil then
+    vim.keymap.set('n', M.settings.popup.perform_action, function()
+      local text = u.get_buffer_text(popup.bufnr)
+      exit(popup)
+      action(text)
+    end, { buffer = true })
+  end
+end
+
+-- Dependencies
+-- These tables are passed to the async.sequence function, which calls them in sequence
+-- before calling an action. They are used to set global state that's required
+-- for each of the actions to occur. This is necessary because some Gitlab behaviors (like
+-- adding a reviewer) requires some initial state.
+M.dependencies      = {
+  info            = { endpoint = "/info", key = "info", state = "INFO" },
+  revisions       = { endpoint = "/mr/revisions", key = "Revisions", state = "MR_REVISIONS" },
+  project_members = { endpoint = "/members", key = "ProjectMembers", state = "PROJECT_MEMBERS" }
+}
+
+
+
 return M