refactor(git): convert blocking subprocess calls to async

lua/git/cmd.lua

@@ -1,3 +1,4 @@
+local git = require("git")
 local log = require("log")
 local repo = require("git.repo")
 local util = require("util")
@@ -39,11 +40,7 @@ local function prefetch_cmds()
     vim.system(
         { "git", "--list-cmds=main,others,alias" },
         { text = true },
-        function(result)
-            vim.schedule(function()
-                populate_cached_cmds(result)
-            end)
-        end
+        vim.schedule_wrap(populate_cached_cmds)
     )
 end
 
@@ -75,33 +72,41 @@ end
 ---@param args string[]
 ---@param conf ow.Git.SplitHandler
 local function run_in_split(worktree, args, conf)
-    vim.cmd("new")
-    local buf = vim.api.nvim_get_current_buf()
-    vim.bo[buf].buftype = "nofile"
-    vim.bo[buf].bufhidden = "hide"
-    vim.bo[buf].swapfile = false
-    vim.bo[buf].modifiable = false
+    local buf = git.new_scratch()
     vim.b[buf].git_worktree = worktree
     if conf.needs_ref then
         local user_ref = first_positional(args, 2) or "HEAD"
-        local sha = repo.rev_parse(worktree, user_ref, true)
-        if sha then
-            vim.b[buf].git_ref = sha
-            vim.b[buf].git_parent_ref =
-                repo.rev_parse(worktree, user_ref .. "^", true)
+        local function apply_name(label)
+            if not vim.api.nvim_buf_is_valid(buf) then
+                return
+            end
+            pcall(vim.api.nvim_buf_set_name, buf, "git://" .. label .. "/")
+            vim.bo[buf].filetype = conf.ft
         end
-        pcall(
-            vim.api.nvim_buf_set_name,
-            buf,
-            "git://" .. (sha or user_ref) .. "/"
-        )
+        repo.rev_parse(worktree, user_ref, true, function(sha)
+            if not sha then
+                apply_name(user_ref)
+                return
+            end
+            repo.rev_parse(worktree, user_ref .. "^", true, function(parent)
+                if not vim.api.nvim_buf_is_valid(buf) then
+                    return
+                end
+                vim.b[buf].git_ref = sha
+                vim.b[buf].git_parent_ref = parent
+                apply_name(sha)
+            end)
+        end)
+    else
+        vim.bo[buf].filetype = conf.ft
     end
-    vim.bo[buf].filetype = conf.ft
 
     local cmd = { "git" }
     vim.list_extend(cmd, args)
-    vim.system(cmd, { cwd = worktree, text = true }, function(obj)
-        vim.schedule(function()
+    vim.system(
+        cmd,
+        { cwd = worktree, text = true },
+        vim.schedule_wrap(function(obj)
             if not vim.api.nvim_buf_is_valid(buf) then
                 return
             end
@@ -124,7 +129,7 @@ local function run_in_split(worktree, args, conf)
                 )
             end
         end)
-    end)
+    )
 end
 
 ---@param worktree string
@@ -132,8 +137,10 @@ end
 local function run_to_messages(worktree, args)
     local cmd = { "git" }
     vim.list_extend(cmd, args)
-    vim.system(cmd, { cwd = worktree, text = true }, function(obj)
-        vim.schedule(function()
+    vim.system(
+        cmd,
+        { cwd = worktree, text = true },
+        vim.schedule_wrap(function(obj)
             local out = vim.trim(obj.stdout or "")
             local err = vim.trim(obj.stderr or "")
             local chunks = {}
@@ -156,7 +163,7 @@ local function run_to_messages(worktree, args)
                 vim.api.nvim_echo(chunks, true, {})
             end
         end)
-    end)
+    )
 end
 
 ---@param args string[]