refactor(nvim): rework whole configuration

modules/home-manager/cli/neovim/files/plugins/gitsign.lua

@@ -0,0 +1,29 @@
+require('gitsigns').setup {
+    on_attach = function(bufnr)
+        local gs = package.loaded.gitsigns
+
+        local function map(mode, l, r, opts)
+            opts = opts or {}
+            opts.buffer = bufnr
+            vim.keymap.set(mode, l, r, opts)
+        end
+
+        -- Navigation
+        map('n', '<leader>gn', function()
+            if vim.wo.diff then return ']c' end
+            vim.schedule(function() gs.next_hunk() end)
+            return '<Ignore>'
+        end, {expr=true})
+
+        map('n', '<leader>gN', function()
+            if vim.wo.diff then return '[c' end
+            vim.schedule(function() gs.prev_hunk() end)
+            return '<Ignore>'
+        end, {expr=true})
+
+        map('n', '<leader>gs', gs.stage_hunk)
+        map('n', '<leader>gr', gs.reset_hunk)
+        map('n', '<leader>gd', gs.diffthis)
+        map('n', '<leader>gd', function() gs.diffthis('~') end)
+    end
+}