fix: convert some warnings to errors

lua/git/diff.lua

@@ -72,11 +72,11 @@ end
 local function uri_split(opts, buf, rev)
     local r = repo.resolve(buf)
     if not r then
-        util.warning("git URI buffer has no worktree")
+        util.error("git URI buffer has no worktree")
         return
     end
     if not rev.path then
-        util.warning("git URI has no path, cannot diff against worktree")
+        util.error("git URI has no path, cannot diff against worktree")
         return
     end
     local object = require("git.object")
@@ -87,7 +87,7 @@ local function uri_split(opts, buf, rev)
             { cwd = r.worktree, silent = true }
         )
         if not content then
-            util.warning("invalid rev: %s", opts.rev)
+            util.error("invalid rev: %s", opts.rev)
             return
         end
         place_pair(
@@ -102,7 +102,7 @@ local function uri_split(opts, buf, rev)
     if not opts.rev then
         local worktree_path = vim.fs.joinpath(r.worktree, rev.path)
         if not vim.uv.fs_stat(worktree_path) then
-            util.warning("worktree file does not exist: %s", rev.path)
+            util.error("worktree file does not exist: %s", rev.path)
             return
         end
         local worktree_buf = vim.fn.bufadd(worktree_path)
@@ -112,7 +112,7 @@ local function uri_split(opts, buf, rev)
     end
 
     if rev.stage == 1 then
-        util.warning("gD on merge base is ambiguous, use :Gdiffsplit <rev>")
+        util.error("gD on merge base is ambiguous, use :Gdiffsplit <rev>")
         return
     end
 
@@ -129,7 +129,7 @@ local function uri_split(opts, buf, rev)
         { cwd = r.worktree, silent = true }
     )
     if not content then
-        util.warning("invalid rev: %s", other_rev:format())
+        util.error("invalid rev: %s", other_rev:format())
         return
     end
     place_pair(buf, object.buf_for(r, other_rev, content), left, opts.vertical)
@@ -150,17 +150,17 @@ function M.split(opts)
     end
 
     if cur_path == "" then
-        util.warning("no file in current buffer")
+        util.error("no file in current buffer")
         return
     end
     if vim.bo[cur_buf].buftype ~= "" then
-        util.warning("cannot diff this buffer (not a worktree file)")
+        util.error("cannot diff this buffer (not a worktree file)")
         return
     end
     cur_path = vim.fn.resolve(cur_path)
     local r = repo.resolve(cur_path)
     if not r then
-        util.warning("not in a git repository")
+        util.error("not in a git repository")
         return
     end
     local rel = vim.fs.relpath(r.worktree, cur_path)
@@ -178,7 +178,7 @@ function M.split(opts)
         { cwd = r.worktree, silent = true }
     )
     if not content then
-        util.warning("invalid rev: %s", rev:format())
+        util.error("invalid rev: %s", rev:format())
         return
     end
     local buf = require("git.object").buf_for(r, rev, content)