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/actions/summary.lua

@@ -0,0 +1,40 @@
+-- This module is responsible for the MR description
+-- This lets the user open the description in a popup and
+-- send edits to the description back to Gitlab
+local Popup            = require("nui.popup")
+local job              = require("gitlab.job")
+local state            = require("gitlab.state")
+local u                = require("gitlab.utils")
+local M                = {}
+
+local descriptionPopup = Popup(u.create_popup_state("Loading Description...", "80%", "80%"))
+
+-- The function will render the MR description in a popup
+M.summary              = function()
+  descriptionPopup:mount()
+  local currentBuffer = vim.api.nvim_get_current_buf()
+  local title = state.INFO.title
+  local description = state.INFO.description
+  local lines = {}
+  for line in description:gmatch("[^\n]+") do
+    table.insert(lines, line)
+    table.insert(lines, "")
+  end
+  vim.schedule(function()
+    vim.api.nvim_buf_set_lines(currentBuffer, 0, -1, false, lines)
+    descriptionPopup.border:set_text("top", title, "center")
+    state.set_popup_keymaps(descriptionPopup, M.edit_description)
+  end)
+end
+
+-- This function will PUT the new description to the Go server
+M.edit_description     = function(text)
+  local jsonTable = { description = text }
+  local json = vim.json.encode(jsonTable)
+  job.run_job("/mr/description", "PUT", json, function(data)
+    vim.notify(data.message, vim.log.levels.INFO)
+    state.INFO.description = data.mr.description
+  end)
+end
+
+return M