feat(git): add blame side window with synced scroll

2026-05-26 15:35:11 +02:00
parent ebfa15c276
commit db0b2d2527
4 changed files with 309 additions and 0 deletions
@@ -6,8 +6,14 @@ local M = {}

 local NS_INLINE = vim.api.nvim_create_namespace("ow.git.blame.inline")
 local NS_POPUP = vim.api.nvim_create_namespace("ow.git.blame.popup")
+local NS_VIEW = vim.api.nvim_create_namespace("ow.git.blame.view")

 local ZERO_SHA = string.rep("0", 40)
+local SHA_W = 8
+local AUTHOR_W = 20
+local DATE_W = 10
+local GAP = "  "
+local VIEW_WIDTH = SHA_W + #GAP + AUTHOR_W + #GAP + DATE_W

 ---@class ow.Git.Blame.Commit
 ---@field sha string
@@ -441,6 +447,207 @@ function M.toggle_inline(buf)
    end
 end

+---@class ow.Git.Blame.View
+---@field source_buf integer
+---@field source_win integer
+---@field view_buf integer
+---@field view_win integer
+---@field group integer
+
+---@type table<integer, ow.Git.Blame.View>
+local views = {}
+
+---@param s string
+---@param w integer
+---@return string
+local function pad_w(s, w)
+    local sw = vim.api.nvim_strwidth(s)
+    if sw > w then
+        return vim.fn.strcharpart(s, 0, w)
+    end
+    return s .. string.rep(" ", w - sw)
+end
+
+---@param state ow.Git.Blame.BufState
+---@param line_count integer
+---@return string[]
+local function build_view_lines(state, line_count)
+    local lines = {}
+    for lnum = 1, line_count do
+        local sha = state.line_sha[lnum]
+        local commit = sha and state.commits[sha]
+        if commit and not util.is_zero_sha(sha) then
+            local author = pad_w(commit.author, AUTHOR_W)
+            local date = os.date("%Y-%m-%d", commit.author_time)
+            lines[lnum] = sha:sub(1, SHA_W) .. GAP .. author .. GAP .. date
+        else
+            lines[lnum] = pad_w("Uncommitted", VIEW_WIDTH)
+        end
+    end
+    return lines
+end
+
+---@param view ow.Git.Blame.View
+---@param state ow.Git.Blame.BufState
+local function render_view(view, state)
+    if not vim.api.nvim_buf_is_valid(view.view_buf) then
+        return
+    end
+    local line_count = vim.api.nvim_buf_line_count(view.source_buf)
+    local lines = build_view_lines(state, line_count)
+    util.set_buf_lines(view.view_buf, 0, -1, lines)
+    vim.api.nvim_buf_clear_namespace(view.view_buf, NS_VIEW, 0, -1)
+    local author_col = SHA_W + #GAP
+    local date_col = author_col + AUTHOR_W + #GAP
+    for lnum = 1, #lines do
+        local sha = state.line_sha[lnum]
+        if sha and not util.is_zero_sha(sha) then
+            pcall(vim.api.nvim_buf_set_extmark, view.view_buf, NS_VIEW, lnum - 1, 0, {
+                end_col = SHA_W,
+                hl_group = "GitBlameSha",
+            })
+            pcall(vim.api.nvim_buf_set_extmark, view.view_buf, NS_VIEW, lnum - 1, author_col, {
+                end_col = author_col + AUTHOR_W,
+                hl_group = "GitBlameAuthor",
+            })
+            pcall(vim.api.nvim_buf_set_extmark, view.view_buf, NS_VIEW, lnum - 1, date_col, {
+                end_col = date_col + DATE_W,
+                hl_group = "GitBlameDate",
+            })
+        end
+    end
+end
+
+---@param source_buf integer
+local function close_view(source_buf)
+    local view = views[source_buf]
+    if not view then
+        return
+    end
+    views[source_buf] = nil
+    pcall(vim.api.nvim_del_augroup_by_id, view.group)
+    if vim.api.nvim_win_is_valid(view.source_win) then
+        vim.wo[view.source_win].scrollbind = false
+        vim.wo[view.source_win].cursorbind = false
+    end
+    if vim.api.nvim_win_is_valid(view.view_win) then
+        pcall(vim.api.nvim_win_close, view.view_win, true)
+    end
+end
+
+---@param source_buf integer
+---@param state ow.Git.Blame.BufState
+---@param source_win integer
+local function open_view(source_buf, state, source_win)
+    local view_buf = vim.api.nvim_create_buf(false, true)
+    util.setup_scratch(view_buf, { buftype = "nofile", bufhidden = "wipe" })
+    vim.bo[view_buf].filetype = "gitblame"
+    local view_win = vim.api.nvim_open_win(view_buf, false, {
+        split = "left",
+        width = VIEW_WIDTH,
+        win = source_win,
+    })
+    vim.api.nvim_set_option_value("number", false, { win = view_win, scope = "local" })
+    vim.api.nvim_set_option_value("relativenumber", false, { win = view_win, scope = "local" })
+    vim.api.nvim_set_option_value("signcolumn", "no", { win = view_win, scope = "local" })
+    vim.api.nvim_set_option_value("foldcolumn", "0", { win = view_win, scope = "local" })
+    vim.api.nvim_set_option_value("wrap", false, { win = view_win, scope = "local" })
+    vim.api.nvim_set_option_value("cursorline", true, { win = view_win, scope = "local" })
+    vim.api.nvim_set_option_value("winfixwidth", true, { win = view_win, scope = "local" })
+    vim.api.nvim_set_option_value("statuscolumn", "", { win = view_win, scope = "local" })
+
+    if not vim.tbl_contains(vim.opt.scrollopt:get(), "ver") then
+        vim.opt.scrollopt:append("ver")
+    end
+    vim.wo[source_win].scrollbind = true
+    vim.wo[source_win].cursorbind = true
+    vim.wo[view_win].scrollbind = true
+    vim.wo[view_win].cursorbind = true
+
+    local group = vim.api.nvim_create_augroup(
+        "ow.git.blame.view." .. source_buf,
+        { clear = true }
+    )
+
+    ---@type ow.Git.Blame.View
+    local view = {
+        source_buf = source_buf,
+        source_win = source_win,
+        view_buf = view_buf,
+        view_win = view_win,
+        group = group,
+    }
+    views[source_buf] = view
+    render_view(view, state)
+    vim.api.nvim_win_call(view_win, function()
+        vim.cmd("syncbind")
+    end)
+
+    vim.api.nvim_create_autocmd("WinClosed", {
+        group = group,
+        callback = function(args)
+            local closed = tonumber(args.match)
+            if closed == view_win or closed == source_win then
+                vim.schedule(function()
+                    close_view(source_buf)
+                end)
+            end
+        end,
+    })
+    vim.api.nvim_create_autocmd({ "BufWipeout", "BufDelete" }, {
+        group = group,
+        buffer = view_buf,
+        callback = function()
+            vim.schedule(function()
+                close_view(source_buf)
+            end)
+        end,
+    })
+
+    vim.keymap.set("n", "<CR>", function()
+        local lnum = vim.api.nvim_win_get_cursor(view_win)[1]
+        local sha = state.line_sha[lnum]
+        if not sha or util.is_zero_sha(sha) then
+            util.warning("git blame: line is not committed yet")
+            return
+        end
+        object.open(state.repo, sha, { split = false })
+    end, { buffer = view_buf, silent = true, desc = "Open the commit" })
+    vim.keymap.set("n", "q", function()
+        close_view(source_buf)
+    end, { buffer = view_buf, silent = true, desc = "Close the blame view" })
+end
+
+---@param buf integer?
+function M.toggle_view(buf)
+    buf = resolve_buf(buf)
+    if views[buf] then
+        close_view(buf)
+        return
+    end
+    local state = ensure_state(buf)
+    if not state then
+        util.warning("git blame: nothing to blame in this buffer")
+        return
+    end
+    local source_win = vim.api.nvim_get_current_win()
+    if vim.api.nvim_win_get_buf(source_win) ~= buf then
+        source_win = vim.fn.bufwinid(buf)
+    end
+    if source_win == -1 then
+        return
+    end
+    run_blame(state, buf, function()
+        if
+            not vim.api.nvim_buf_is_valid(buf)
+            or not vim.api.nvim_win_is_valid(source_win)
+        then
+            return
+        end
+        open_view(buf, state, source_win)
+    end)
+end
+
 ---@param lines string[]
 ---@return integer width
 ---@return integer height
@@ -677,6 +884,7 @@ end

 ---@param buf integer
 function M.detach(buf)
+    close_view(buf)
    local state = states[buf]
    if not state then
        return