[mini.git] Better git blame

[drowning-cat]

Related: neovim/neovim#35678

local MiniGit = require("mini.git")
MiniGit.setup()

vim.api.nvim_set_hl(0, "GitBlameHashRoot", { link = "Tag" })
vim.api.nvim_set_hl(0, "GitBlameHash", { link = "Identifier" })
vim.api.nvim_set_hl(0, "GitBlameAuthor", { link = "String" })
vim.api.nvim_set_hl(0, "GitBlameDate", { link = "Comment" })

vim.api.nvim_create_autocmd("User", {
  pattern = "MiniGitCommandSplit",
  callback = function(e)
    if e.data.git_subcommand ~= "blame" then
      return
    end
    local win_src = e.data.win_source
    local buf = e.buf
    local win = e.data.win_stdout
    -- Opts
    vim.bo[buf].modifiable = false
    vim.wo[win].wrap = false
    vim.wo[win].cursorline = true
    -- View
    vim.fn.winrestview({ topline = vim.fn.line("w0", win_src) })
    vim.api.nvim_win_set_cursor(0, { vim.fn.line(".", win_src), 0 })
    vim.wo[win].scrollbind, vim.wo[win_src].scrollbind = true, true
    vim.wo[win].cursorbind, vim.wo[win_src].cursorbind = true, true
    -- Vert width
    if e.data.cmd_input.mods == "vertical" then
      local lines = vim.api.nvim_buf_get_lines(0, 1, -1, false)
      local width = vim.iter(lines):fold(-1, function(acc, ln)
        local stat = string.match(ln, "^%S+ %b()")
        return math.max(acc, vim.fn.strwidth(stat))
      end)
      width = width + vim.fn.getwininfo(win)[1].textoff
      vim.api.nvim_win_set_width(win, width)
    end
    -- Highlight
    vim.fn.matchadd("GitBlameHashRoot", [[^^\w\+]])
    vim.fn.matchadd("GitBlameHash", [[^\w\+]])
    local leftmost = [[^.\{-}\zs]]
    vim.fn.matchadd("GitBlameAuthor", leftmost .. [[(\zs.\{-} \ze\d\{4}-]])
    vim.fn.matchadd("GitBlameDate", leftmost .. [[[0-9-]\{10} [0-9:]\{8} +\d\+]])
  end,
})

[echasnovski]

Thanks for sharing! Looks nice.

One massive thing that I'd recommend changing is to move all vim.api.nvim_set_hl() call outside of the autocommand callback. They only need to be created once. And indeed I'd personally not use namespace, but it is fine either way.