From c54ff48ac3abb62a40eb1a438da8e3e7ef139797 Mon Sep 17 00:00:00 2001
From: Lexi Winter <lexi@le-fay.org>
Date: Sat, 28 Jun 2025 20:40:25 +0100
Subject: posix: add tempfile()

---
 nihil.posix/write_file.ccm | 82 ----------------------------------------------
 1 file changed, 82 deletions(-)
 delete mode 100644 nihil.posix/write_file.ccm

(limited to 'nihil.posix/write_file.ccm')

diff --git a/nihil.posix/write_file.ccm b/nihil.posix/write_file.ccm
deleted file mode 100644
index 867e0db..0000000
--- a/nihil.posix/write_file.ccm
+++ /dev/null
@@ -1,82 +0,0 @@
-/*
- * This source code is released into the public domain.
- */
-
-module;
-
-#include <coroutine>
-#include <expected>
-#include <filesystem>
-#include <ranges>
-#include <system_error>
-#include <vector>
-
-#include <fcntl.h>
-#include <unistd.h>
-
-export module nihil.posix:write_file;
-
-import nihil.error;
-import nihil.guard;
-import nihil.monad;
-import :fd;
-import :open;
-import :rename;
-
-namespace nihil {
-
-/*
- * Write the contents of a range to a file.  Returns the number of bytes
- * written.
- */
-export [[nodiscard]]
-auto write_file(std::filesystem::path const &filename,
-		std::ranges::contiguous_range auto &&range,
-		int mode = 0777)
-	-> std::expected<std::size_t, error>
-{
-	auto file = co_await open(filename, O_CREAT|O_WRONLY, mode);
-	auto nbytes = co_await write(file, range);
-	co_return nbytes;
-}
-
-/*
- * Utility wrapper for non-contiguous ranges.
- */
-export [[nodiscard]]
-auto write_file(std::filesystem::path const &filename,
-		std::ranges::range auto &&range)
-	-> std::expected<std::size_t, error>
-requires(!std::ranges::contiguous_range<decltype(range)>)
-{
-	return write_file(filename, std::vector(std::from_range, range));
-}
-
-/*
- * Write the contents of a range to a file safely.  The data will be written
- * to "<filename>.tmp", and if the write succeeds, the temporary file will be
- * renamed to the target filename.  If an error occurs, the target file will
- * not be modified.
- */
-export [[nodiscard]]
-auto safe_write_file(std::filesystem::path const &filename,
-		     std::ranges::range auto &&range)
-	-> std::expected<void, error>
-{
-	auto tmpfile = filename;
-	tmpfile.remove_filename();
-	tmpfile /= (filename.filename().native() + ".tmp");
-
-	auto tmpfile_guard = guard([&tmpfile] {
-		::unlink(tmpfile.c_str());
-	});
-
-	co_await write_file(tmpfile, range);
-	co_await nihil::rename(tmpfile, filename);
-
-	tmpfile_guard.release();
-	co_return {};
-}
-
-
-} // namespace nihil
-- 
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