Add Filtering, HealthCheck, Better Tests (#350)

feat: add filtering when choosing merge requests (#346)
feat: Add healthcheck (#345)
refactor: Move to gomock (#349)
feat: Makes the remote of the plugin configurable (#348)

This is a #MINOR release.

lua/gitlab/health.lua

@@ -0,0 +1,146 @@
+local state = require("gitlab.state")
+local List = require("gitlab.utils.list")
+local u = require("gitlab.utils")
+local M = {}
+
+local function check_go_version()
+  local go_version = io.popen("go version"):read("*a")
+  if go_version then
+    local major, minor, _ = go_version:match("(%d+)%.(%d+)%.(%d+)")
+    if major and tonumber(major) >= 1 and tonumber(minor) >= 19 then
+      return
+    else
+      return "Go is installed, but version is older than 1.19."
+    end
+  else
+    return "Go is not installed."
+  end
+end
+
+---Checks the health of the plugin
+---@param return_results boolean
+M.check = function(return_results)
+  local warnings = List.new({})
+  local errors = List.new({})
+
+  if not return_results then
+    vim.health.start("gitlab.nvim")
+  end
+
+  if state.settings.reviewer == "delta" then
+    table.insert(
+      warnings,
+      "Delta is no longer a supported reviewer, please use diffview and update your setup function"
+    )
+  end
+
+  local required_deps = {
+    {
+      name = "MunifTanjim/nui.nvim",
+      package = "nui.popup",
+    },
+    {
+      name = "nvim-lua/plenary.nvim",
+      package = "plenary",
+    },
+    {
+      name = "sindrets/diffview.nvim",
+      package = "diffview",
+    },
+  }
+
+  local recommended_deps = {
+    {
+      name = "stevearc/dressing.nvim",
+      package = "dressing",
+    },
+    {
+      name = "nvim-tree/nvim-web-devicons",
+      package = "nvim-web-devicons",
+    },
+  }
+
+  local go_version_problem = check_go_version()
+  if go_version_problem ~= nil then
+    table.insert(warnings, go_version_problem)
+  end
+
+  for _, dep in ipairs(required_deps) do
+    local ok, _ = pcall(require, dep.package)
+    if not ok then
+      table.insert(errors, string.format("%s is a required dependency, but cannot be found", dep.name))
+    end
+  end
+
+  for _, dep in ipairs(recommended_deps) do
+    local ok, _ = pcall(require, dep.package)
+    if not ok then
+      table.insert(warnings, string.format("%s is a recommended dependency", dep.name))
+    end
+  end
+
+  local removed_fields_in_user_config = {}
+  local removed_settings_fields = {
+    "dialogue",
+    "discussion_tree.add_emoji",
+    "discussion_tree.copy_node_url",
+    "discussion_tree.delete_comment",
+    "discussion_tree.delete_emoji",
+    "discussion_tree.edit_comment",
+    "discussion_tree.jump_to_file",
+    "discussion_tree.jump_to_reviewer",
+    "discussion_tree.open_in_browser",
+    "discussion_tree.publish_draft",
+    "discussion_tree.refresh_data",
+    "discussion_tree.reply",
+    "discussion_tree.switch_view",
+    "discussion_tree.toggle_all_discussions",
+    "discussion_tree.toggle_draft_mode",
+    "discussion_tree.toggle_node",
+    "discussion_tree.toggle_resolved",
+    "discussion_tree.toggle_resolved_discussions",
+    "discussion_tree.toggle_tree_type",
+    "discussion_tree.toggle_unresolved_discussions",
+    "help",
+    "popup.keymaps.next_field",
+    "popup.keymaps.prev_field",
+    "popup.perform_action",
+    "popup.perform_linewise_action",
+    "review_pane", -- Only relevant for the Delta reviewer
+  }
+
+  for _, field in ipairs(removed_settings_fields) do
+    if u.get_nested_field(state.settings, field) ~= nil then
+      table.insert(removed_fields_in_user_config, field)
+    end
+  end
+
+  if #removed_fields_in_user_config ~= 0 then
+    table.insert(
+      warnings,
+      "The following settings fields have been removed:\n" .. table.concat(removed_fields_in_user_config, "\n")
+    )
+  end
+
+  if #errors > 0 then
+    for _, err in ipairs(errors) do
+      vim.health.error(err)
+    end
+  end
+
+  if #warnings > 0 then
+    for _, err in ipairs(warnings) do
+      vim.health.warn(err)
+    end
+  end
+
+  if #warnings + #errors == 0 then
+    vim.health.ok("Gitlab plugin is okay!")
+  end
+
+  if return_results then
+    return #warnings + #errors == 0
+  end
+end
+
+return M