Git

For this hydra you need next plugins:

• Gitsigns
• Neogit

local Hydra = require("hydra")
local gitsigns = require('gitsigns')

local hint = [[
 _J_: next hunk   _s_: stage hunk        _d_: show deleted   _b_: blame line
 _K_: prev hunk   _u_: undo last stage   _p_: preview hunk   _B_: blame show full 
 ^ ^              _S_: stage buffer      ^ ^                 _/_: show base file
 ^
 ^ ^              _<Enter>_: Neogit              _q_: exit
]]

Pink hydra

Hydra({
   name = 'Git',
   hint = hint,
   config = {
      buffer = bufnr,
      color = 'pink',
      invoke_on_body = true,
      hint = {
         border = 'rounded'
      },
      on_enter = function()
         vim.cmd('silent! %foldopen!')
         vim.bo.modifiable = false
         gitsigns.toggle_signs(true)
         gitsigns.toggle_linehl(true)
      end,
      on_exit = function()
         gitsigns.toggle_signs(false)
         gitsigns.toggle_linehl(false)
         gitsigns.toggle_deleted(false)
      end,
   },
   mode = {'n','x'},
   body = '<leader>g',
   heads = {
      { 'J',
         function()
            if vim.wo.diff then return ']c' end
            vim.schedule(function() gitsigns.next_hunk() end)
            return '<Ignore>'
         end,
         { expr = true, desc = 'next hunk' } },
      { 'K',
         function()
            if vim.wo.diff then return '[c' end
            vim.schedule(function() gitsigns.prev_hunk() end)
            return '<Ignore>'
         end,
         { expr = true, desc = 'prev hunk' } },
      { 's', ':Gitsigns stage_hunk<CR>', { silent = true, desc = 'stage hunk' } },
      { 'u', gitsigns.undo_stage_hunk, { desc = 'undo last stage' } },
      { 'S', gitsigns.stage_buffer, { desc = 'stage buffer' } },
      { 'p', gitsigns.preview_hunk, { desc = 'preview hunk' } },
      { 'd', gitsigns.toggle_deleted, { nowait = true, desc = 'toggle deleted' } },
      { 'b', gitsigns.blame_line, { desc = 'blame' } },
      { 'B', function() gitsigns.blame_line{ full = true } end, { desc = 'blame show full' } },
      { '/', gitsigns.show, { exit = true, desc = 'show base file' } }, -- show the base of the file
      { '<Enter>', '<Cmd>Neogit<CR>', { exit = 'after', desc = 'Neogit' } },
      { 'q', nil, { exit = true, nowait = true, desc = 'exit' } },
   }
})

Red, amaranth and teal colors

If you want to use this hydra with other colors, then code should be sligthly changed. This is need due to async nature of the Gitsigns plugin.

The trick here is in on_key function, which is called after each head and make Neovim process other events. The only drawback that rhs should be Lua function to make this trick work.

Hydra({
   name = 'Git',
   hint = hint,
   config = {
      buffer = bufnr,
      color = 'red',
      invoke_on_body = true,
      hint = {
         border = 'rounded'
      },
      on_key = function() vim.wait(50) end,
      on_enter = function()
         vim.cmd('silent! %foldopen!')
         gitsigns.toggle_signs(true)
         gitsigns.toggle_linehl(true)
      end,
      on_exit = function()
         gitsigns.toggle_signs(false)
         gitsigns.toggle_linehl(false)
         gitsigns.toggle_deleted(false)
      end,
   },
   mode = {'n','x'},
   body = '<leader>g',
   heads = {
      { 'J',
         function()
            if vim.wo.diff then return ']c' end
            vim.schedule(function() gitsigns.next_hunk() end)
            return '<Ignore>'
         end,
         { expr = true, desc = 'next hunk' } },
      { 'K',
         function()
            if vim.wo.diff then return '[c' end
            vim.schedule(function() gitsigns.prev_hunk() end)
            return '<Ignore>'
         end,
         { expr = true, desc = 'prev hunk' } },
      { 's',
         function()
            local mode = vim.api.nvim_get_mode().mode:sub(1,1)
            if mode == 'V' then -- visual-line mode
               local esc = vim.api.nvim_replace_termcodes('<Esc>', true, true, true)
               vim.api.nvim_feedkeys(esc, 'x', false) -- exit visual mode
               vim.cmd("'<,'>Gitsigns stage_hunk")
            else
               vim.cmd("Gitsigns stage_hunk")
            end
         end,
         { desc = 'stage hunk' } },
      { 'u', gitsigns.undo_stage_hunk, { desc = 'undo last stage' } },
      { 'S', gitsigns.stage_buffer, { desc = 'stage buffer' } },
      { 'p', gitsigns.preview_hunk, { desc = 'preview hunk' } },
      { 'd', gitsigns.toggle_deleted, { nowait = true, desc = 'toggle deleted' } },
      { 'b', gitsigns.blame_line, { desc = 'blame' } },
      { 'B', function() gitsigns.blame_line{ full = true } end, { desc = 'blame show full' } },
      { '/', gitsigns.show, { exit = true, desc = 'show base file' } }, -- show the base of the file
      { '<Enter>', function() vim.cmd('Neogit') end, { exit = 'after', desc = 'Neogit' } },
      { 'q', nil, { exit = true, nowait = true, desc = 'exit' } },
   }
})