feat: add LvimUpdate command (#1634)

* feat: add prelimenary LvimUpdate command

* feat: use native process management

* feat: add a telescope change-log utility

* fix: update readme to include the new command

lua/core/telescope.lua

@@ -114,6 +114,51 @@ function M.grep_lunarvim_files(opts)
   require("telescope.builtin").live_grep(opts)
 end
 
+function M.view_lunarvim_changelog()
+  local finders = require "telescope.finders"
+  local make_entry = require "telescope.make_entry"
+  local pickers = require "telescope.pickers"
+  local previewers = require "telescope.previewers"
+  local actions = require "telescope.actions"
+  local opts = {}
+
+  local conf = require("telescope.config").values
+  opts.entry_maker = make_entry.gen_from_git_commits(opts)
+
+  pickers.new(opts, {
+    prompt_title = "LunarVim changelog",
+
+    finder = finders.new_oneshot_job(
+      vim.tbl_flatten {
+        "git",
+        "log",
+        "--pretty=oneline",
+        "--abbrev-commit",
+        "--",
+        ".",
+      },
+      opts
+    ),
+    previewer = {
+      previewers.git_commit_diff_to_parent.new(opts),
+      previewers.git_commit_diff_to_head.new(opts),
+      previewers.git_commit_diff_as_was.new(opts),
+      previewers.git_commit_message.new(opts),
+    },
+
+    --TODO: consider opening a diff view when pressing enter
+    attach_mappings = function(_, map)
+      map("i", "<enter>", actions._close)
+      map("n", "<enter>", actions._close)
+      map("i", "<esc>", actions._close)
+      map("n", "<esc>", actions._close)
+      map("n", "q", actions._close)
+      return true
+    end,
+    sorter = conf.file_sorter(opts),
+  }):find()
+end
+
 function M.setup()
   local telescope = require "telescope"