✨ Add explicit reopen-with-policy helper

README.md

@@ -26,7 +26,7 @@ BitLogger 是一个基于 MoonBit 编写的结构化日志库。
 - 🧷 可绑定上下文：支持 `bind(...)` 与 `fields(...)`，更方便地封装复用字段上下文。
 - 📮 显式队列：支持 `queued_sink(...)` / `with_queue(...)`、有界积压与溢出策略，作为后续 async sink 的 runtime-safe 基础。
 - 🧾 可配置文本格式：支持 `text_formatter(...)`、`format_text(...)`、`text_console_sink(...)`、`formatted_callback_sink(...)` 与模板化 `template` 输出。
-- 💾 Native 文件输出：支持 `file_sink(...)`、基础 size rotation / backup retention、显式 `reopen()` 与失败计数；当前仅保证 `native/llvm` backend 可用。
+- 💾 Native 文件输出：支持 `file_sink(...)`、基础 size rotation / backup retention、显式 `reopen()` / `reopen_with_current_policy()` 与失败计数；当前仅保证 `native/llvm` backend 可用。
 - 📦 面向 MoonBit：API 和工程结构围绕 MoonBit 的 package / visibility / toolchain 现实约束设计。
 
 ## 🚀 快速开始
@@ -221,13 +221,13 @@ if native_files_supported() {
 - 当前提供 JSON 配置层：`parse_logger_config_text(...)`、`stringify_logger_config(...)`、`build_logger(...)`
 - 已支持字段：`min_level`、`target`、`timestamp`、`sink.kind`、`sink.path`、`sink.append`、`sink.auto_flush`、`sink.rotation`、`sink.text_formatter`、`queue`
 - `sink.rotation` 当前支持 `max_bytes` 与 `max_backups`，提供基础 size-based rotation 和 backup retention
-- `file_sink(...)` 还提供 `reopen()`、`open_failures()`、`write_failures()`、`flush_failures()`、`rotation_failures()`，用于基础可观测性
-- `file_sink(...)` 当前还提供 `append_mode()`；`reopen(append=...)` 在显式传值时会更新后续 reopen 使用的 append 策略
+- `file_sink(...)` 还提供 `reopen()`、`reopen_with_current_policy()`、`open_failures()`、`write_failures()`、`flush_failures()`、`rotation_failures()`，用于基础可观测性
+- `file_sink(...)` 当前还提供 `append_mode()`；`reopen(append=...)` 在显式传值时会更新后续 reopen 使用的 append 策略，`reopen_with_current_policy()` 则把“按当前保存策略重开”变成显式动作
 - `file_sink(...)` 也支持 `set_append_mode(...)`，用于显式修改后续 reopen 将使用的 append 策略
 - `file_sink(...)` 也可直接读取 `path()` 与 `auto_flush_enabled()` 等基础 file 策略状态
 - `file_sink(...)` 还提供 `rotation_enabled()` 与 `rotation_config()`，可直接查询当前 rotation 策略是否启用及其参数
 - `file_sink(...)` 也支持 `set_auto_flush(...)`、`set_rotation(...)`、`clear_rotation()`，可在运行期调整基础写出策略
-- `build_logger(...)` 产出的 `ConfiguredLogger` 同样提供 `file_reopen()`、`file_flush()`、`file_close()`、`file_append_mode()`、`file_path()`、`file_auto_flush()`、`file_rotation_enabled()`、`file_rotation_config()`，以及 `file_set_append_mode(...)`、`file_set_auto_flush(...)`、`file_set_rotation(...)`、`file_clear_rotation()` 与对应 file failure 计数访问器，便于配置式接入后继续运维控制
+- `build_logger(...)` 产出的 `ConfiguredLogger` 同样提供 `file_reopen()`、`file_reopen_with_current_policy()`、`file_flush()`、`file_close()`、`file_append_mode()`、`file_path()`、`file_auto_flush()`、`file_rotation_enabled()`、`file_rotation_config()`，以及 `file_set_append_mode(...)`、`file_set_auto_flush(...)`、`file_set_rotation(...)`、`file_clear_rotation()` 与对应 file failure 计数访问器，便于配置式接入后继续运维控制
 - `sink.text_formatter.template` 当前支持固定 token：`{timestamp}`、`{timestamp_ms}`、`{level}`、`{target}`、`{message}`、`{fields}`
 - 当前可由配置直接组装的 sink 类型：`console`、`json_console`、`text_console`、`file`
 - `queue` 会作为显式包装层附着在最终 sink 外侧；这仍然是同步 drain 模型，不是 async runtime

bitlogger/BitLogger_test.mbt

@@ -285,6 +285,8 @@ test "configured logger can reopen built file sink" {
     inspect(logger.file_append_mode(), content="false")
     inspect(logger.file_reopen(), content="true")
     inspect(logger.file_append_mode(), content="false")
+    inspect(logger.file_reopen_with_current_policy(), content="true")
+    inspect(logger.file_append_mode(), content="false")
     inspect(logger.close(), content="true")
   } else {
     inspect(logger.file_append_mode(), content="true")
@@ -295,6 +297,8 @@ test "configured logger can reopen built file sink" {
     inspect(logger.file_open_failures(), content="2")
     inspect(logger.file_reopen(append=Some(false)), content="false")
     inspect(logger.file_append_mode(), content="false")
+    inspect(logger.file_reopen_with_current_policy(), content="false")
+    inspect(logger.file_open_failures(), content="3")
   }
 }
 

bitlogger/BitLogger_wbtest.mbt

@@ -177,6 +177,8 @@ test "file sink reopen and failure counters reflect backend state" {
     inspect(sink.append_mode(), content="false")
     inspect(sink.reopen(), content="true")
     inspect(sink.append_mode(), content="false")
+    inspect(sink.reopen_with_current_policy(), content="true")
+    inspect(sink.append_mode(), content="false")
     inspect(sink.close(), content="true")
     ignore(remove_file_internal("bitlogger-reopen.log"))
   } else {
@@ -189,6 +191,8 @@ test "file sink reopen and failure counters reflect backend state" {
     inspect(sink.flush_failures(), content="0")
     inspect(sink.reopen(append=Some(false)), content="false")
     inspect(sink.append_mode(), content="false")
+    inspect(sink.reopen_with_current_policy(), content="false")
+    inspect(sink.open_failures(), content="3")
   }
 }
 

bitlogger/README.mbt.md

@@ -46,8 +46,8 @@ BitLogger 是一个基于 MoonBit 的结构化日志库。
 - 支持 `parse_logger_config_text(...)`、`stringify_logger_config(...)` 进行最小 JSON 配置读写
 - config-driven logger assembly via `build_logger(...)`
 - 支持 `build_logger(...)` 将配置组装为可直接使用的 logger
-- native-only file output via `file_sink(...)`, with basic size rotation, backup retention, explicit `reopen()`, and failure counters
-- 支持 `file_sink(...)`、基础 size rotation / backup retention、显式 `reopen()` 与失败计数，但当前仅保证 `native/llvm` backend 可用
+- native-only file output via `file_sink(...)`, with basic size rotation, backup retention, explicit `reopen()` / `reopen_with_current_policy()`, and failure counters
+- 支持 `file_sink(...)`、基础 size rotation / backup retention、显式 `reopen()` / `reopen_with_current_policy()` 与失败计数，但当前仅保证 `native/llvm` backend 可用
 
 ## Example / 示例
 
@@ -220,7 +220,7 @@ test {
 - basic rotation is size-based / 当前基础轮转为按文件大小触发
 - `file_rotation(max_bytes, max_backups=...)` controls threshold and retained backups / `file_rotation(max_bytes, max_backups=...)` 控制触发阈值和保留备份数
 - JSON config uses `sink.rotation.max_bytes` and `sink.rotation.max_backups` / JSON 配置使用 `sink.rotation.max_bytes` 与 `sink.rotation.max_backups`
-- `FileSink::reopen()` can explicitly reopen the current file handle / `FileSink::reopen()` 可显式重开当前文件句柄
+- `FileSink::reopen()` can explicitly reopen the current file handle, and `FileSink::reopen_with_current_policy()` makes the stored-policy reopen path explicit / `FileSink::reopen()` 可显式重开当前文件句柄，`FileSink::reopen_with_current_policy()` 则把“按当前保存策略重开”变成显式动作
 - `append_mode()` exposes the current append policy, and `reopen(append=...)` updates that policy for later reopen calls / `append_mode()` 可读取当前 append 策略，`reopen(append=...)` 会更新后续 reopen 复用的 append 策略
 - `set_append_mode(...)` updates the stored append policy without forcing an immediate reopen / `set_append_mode(...)` 可直接更新保存的 append 策略，但不会强制立即 reopen
 - `path()` and `auto_flush_enabled()` expose core file sink policy state / `path()` 与 `auto_flush_enabled()` 可读取 file sink 的基础策略状态

bitlogger/config.mbt

@@ -231,6 +231,14 @@ pub fn RuntimeSink::file_reopen(self : RuntimeSink, append~ : Bool? = None) -> B
   }
 }
 
+pub fn RuntimeSink::file_reopen_with_current_policy(self : RuntimeSink) -> Bool {
+  match self {
+    File(sink) => sink.reopen_with_current_policy()
+    QueuedFile(sink) => sink.sink.reopen_with_current_policy()
+    _ => false
+  }
+}
+
 pub fn RuntimeSink::file_append_mode(self : RuntimeSink) -> Bool {
   match self {
     File(sink) => sink.append_mode()
@@ -411,6 +419,10 @@ pub fn ConfiguredLogger::file_reopen(self : ConfiguredLogger, append~ : Bool? =
   self.sink.file_reopen(append=append)
 }
 
+pub fn ConfiguredLogger::file_reopen_with_current_policy(self : ConfiguredLogger) -> Bool {
+  self.sink.file_reopen_with_current_policy()
+}
+
 pub fn ConfiguredLogger::file_append_mode(self : ConfiguredLogger) -> Bool {
   self.sink.file_append_mode()
 }

bitlogger/sinks.mbt

@@ -197,6 +197,10 @@ pub fn FileSink::reopen(self : FileSink, append~ : Bool? = None) -> Bool {
   }
 }
 
+pub fn FileSink::reopen_with_current_policy(self : FileSink) -> Bool {
+  self.reopen()
+}
+
 fn rotated_file_path(path : String, index : Int) -> String {
   "\{path}.\{index}"
 }

docs/README-en.md

@@ -26,7 +26,7 @@ BitLogger currently provides:
 - bounded backlog with `QueueOverflowPolicy::DropNewest` and `QueueOverflowPolicy::DropOldest`
 - configurable text formatting via `text_formatter(...)`, `format_text(...)`, `text_console_sink(...)`, and template-driven `template` output
 - formatter-based callback integration via `formatted_callback_sink(...)`
-- native-only file output via `file_sink(...)`, with basic size rotation, backup retention, explicit `reopen()`, and failure counters
+- native-only file output via `file_sink(...)`, with basic size rotation, backup retention, explicit `reopen()` / `reopen_with_current_policy()`, and failure counters
 - `native_files_supported()` for backend capability detection
 - default global logger helpers
 
@@ -206,13 +206,13 @@ if native_files_supported() {
 - BitLogger now includes a JSON config layer via `parse_logger_config_text(...)`, `stringify_logger_config(...)`, and `build_logger(...)`.
 - Supported keys include `min_level`, `target`, `timestamp`, `sink.kind`, `sink.path`, `sink.append`, `sink.auto_flush`, `sink.rotation`, `sink.text_formatter`, and `queue`.
 - `sink.rotation` currently supports `max_bytes` and `max_backups` for basic size-based rotation and backup retention.
-- `file_sink(...)` also exposes `reopen()`, `open_failures()`, `write_failures()`, `flush_failures()`, and `rotation_failures()` for basic observability.
-- `file_sink(...)` also exposes `append_mode()`. Passing `append=...` to `reopen(...)` updates the current append policy used by later reopen calls.
+- `file_sink(...)` also exposes `reopen()`, `reopen_with_current_policy()`, `open_failures()`, `write_failures()`, `flush_failures()`, and `rotation_failures()` for basic observability.
+- `file_sink(...)` also exposes `append_mode()`. Passing `append=...` to `reopen(...)` updates the current append policy used by later reopen calls, while `reopen_with_current_policy()` makes that stored-policy reopen path explicit.
 - `file_sink(...)` also supports `set_append_mode(...)` for explicitly changing the append policy that later reopen calls will use.
 - `file_sink(...)` also exposes `path()` and `auto_flush_enabled()` for reading basic file-sink policy state.
 - `file_sink(...)` also exposes `rotation_enabled()` and `rotation_config()` for reading whether rotation is active and which parameters are currently in effect.
 - `file_sink(...)` also supports `set_auto_flush(...)`, `set_rotation(...)`, and `clear_rotation()` for runtime policy updates.
-- `ConfiguredLogger` built through `build_logger(...)` also exposes `file_reopen()`, `file_flush()`, `file_close()`, `file_append_mode()`, `file_path()`, `file_auto_flush()`, `file_rotation_enabled()`, `file_rotation_config()`, plus `file_set_append_mode(...)`, `file_set_auto_flush(...)`, `file_set_rotation(...)`, `file_clear_rotation()`, and the corresponding file failure counters, so config-driven file logging keeps a usable control surface.
+- `ConfiguredLogger` built through `build_logger(...)` also exposes `file_reopen()`, `file_reopen_with_current_policy()`, `file_flush()`, `file_close()`, `file_append_mode()`, `file_path()`, `file_auto_flush()`, `file_rotation_enabled()`, `file_rotation_config()`, plus `file_set_append_mode(...)`, `file_set_auto_flush(...)`, `file_set_rotation(...)`, `file_clear_rotation()`, and the corresponding file failure counters, so config-driven file logging keeps a usable control surface.
 - `sink.text_formatter.template` currently supports fixed tokens: `{timestamp}`, `{timestamp_ms}`, `{level}`, `{target}`, `{message}`, and `{fields}`.
 - Config-driven sink assembly currently supports `console`, `json_console`, `text_console`, and `file`.
 - `queue` remains a synchronous bounded wrapper around the final sink, not an async runtime.

docs/changes/0.3.0.md

@@ -37,6 +37,7 @@ version 0.3.0
 - feat: add `rotation_enabled()` / `rotation_config()` on `FileSink` and `file_rotation_enabled()` / `file_rotation_config()` on `ConfiguredLogger` for rotation-policy introspection
 - feat: add runtime file-policy mutators `set_auto_flush(...)`, `set_rotation(...)`, `clear_rotation()` and corresponding configured-logger forwarding helpers
 - feat: add explicit append-policy setter `set_append_mode(...)` / `file_set_append_mode(...)` so append strategy can be updated without piggybacking on `reopen(...)`
+- feat: add explicit `reopen_with_current_policy()` / `file_reopen_with_current_policy()` helpers so stored append-policy reopen is discoverable instead of implicit
 - feat: add `SplitSink`, `split_sink(...)`, and `split_by_level(...)` for routing records into different sinks by predicate or level
 - feat: add `Logger::bind(...)` as an ergonomic context-binding alias and `fields(...)` helper for tuple-based field construction