add gitsigns mappings for git hunk management

init.lua

@@ -75,6 +75,66 @@ require('gitsigns').setup {
     topdelete = { text = '‾' },
    changedelete = { text = '~' },
   },
+   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', 'v' }, ']c', function()
+          if vim.wo.diff then
+            return ']c'
+          end
+          vim.schedule(function()
+            gs.next_hunk()
+          end)
+          return '<Ignore>'
+        end, { expr = true, desc = 'Jump to next hunk' })
+
+        map({ 'n', 'v' }, '[c', function()
+          if vim.wo.diff then
+            return '[c'
+          end
+          vim.schedule(function()
+            gs.prev_hunk()
+          end)
+          return '<Ignore>'
+        end, { expr = true, desc = 'Jump to previous hunk' })
+
+        -- Actions
+        -- visual mode
+        map('v', '<leader>gs', function()
+          gs.stage_hunk { vim.fn.line '.', vim.fn.line 'v' }
+        end, { desc = 'stage git hunk' })
+        map('v', '<leader>gr', function()
+          gs.reset_hunk { vim.fn.line '.', vim.fn.line 'v' }
+        end, { desc = 'reset git hunk' })
+        -- normal mode
+        map('n', '<leader>gs', gs.stage_hunk, { desc = 'git stage hunk' })
+        map('n', '<leader>gr', gs.reset_hunk, { desc = 'git reset hunk' })
+        map('n', '<leader>gS', gs.stage_buffer, { desc = 'git Stage buffer' })
+        map('n', '<leader>gu', gs.undo_stage_hunk, { desc = 'undo stage hunk' })
+        map('n', '<leader>gR', gs.reset_buffer, { desc = 'git Reset buffer' })
+        map('n', '<leader>gp', gs.preview_hunk, { desc = 'preview git hunk' })
+        map('n', '<leader>gb', function()
+          gs.blame_line { full = false }
+        end, { desc = 'git blame line' })
+        map('n', '<leader>gd', gs.diffthis, { desc = 'git diff against index' })
+        map('n', '<leader>gD', function()
+          gs.diffthis '~'
+        end, { desc = 'git diff against last commit' })
+
+        -- Toggles
+        map('n', '<leader>tb', gs.toggle_current_line_blame, { desc = 'toggle git blame line' })
+        map('n', '<leader>td', gs.toggle_deleted, { desc = 'toggle git show deleted' })
+
+        -- Text object
+        map({ 'o', 'x' }, 'ih', ':<C-U>Gitsigns select_hunk<CR>', { desc = 'select git hunk' })
+      end,
 }
 
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