🎨 Provide API /api/convert/pandoc https://github.com/siyuan-note/siyuan/issues/8235

API.md

@@ -44,6 +44,8 @@
     * [List files](#List-files)
 * [Export](#Export)
     * [Export Markdown](#Export-Markdown)
+* [Conversion](#Conversion)
+    * [Pandoc](#Pandoc)
 * [Notification](#Notification)
     * [Push message](#Push-message)
     * [Push error message](#Push-error-message)
@@ -710,9 +712,10 @@ View API token in <kbd>Settings - About</kbd>, request header: `Authorization: T
   }
   ```
 
-  * `id`: Block ID to move
-  * `previousID`: The ID of the previous block, used to anchor the insertion position
-  * `parentID`: The ID of the parent block, used to anchor the insertion position, `previousID` and `parentID` cannot be empty at the same time, if they exist at the same time, `previousID` will be used first
+    * `id`: Block ID to move
+    * `previousID`: The ID of the previous block, used to anchor the insertion position
+    * `parentID`: The ID of the parent block, used to anchor the insertion position, `previousID` and `parentID` cannot
+      be empty at the same time, if they exist at the same time, `previousID` will be used first
 * Return value
 
   ```json
@@ -1014,6 +1017,41 @@ View API token in <kbd>Settings - About</kbd>, request header: `Authorization: T
     * `hPath`: human-readable path
     * `content`: Markdown content
 
+## Conversion
+
+### Pandoc
+
+* `/api/convert/pandoc`
+* Working directory
+    * Executing the pandoc command will set the working directory to `workspace/temp/convert/pandoc/`
+    * API [`Put file`](#put-file) can be used to write the file to be converted to this directory first
+    * Then call the API for conversion, and the converted file will also be written to this directory
+    * Finally, call the API [`Get file`](#get-file) to get the converted file
+        * Or call the API [Create a document with Markdown](#Create-a-document-with-Markdown)
+        * Or call the internal API `importStdMd` to import the converted folder directly
+* Parameters
+
+  ```json
+  {
+    "args": [
+      "--to", "markdown_strict-raw_html",
+      "foo.epub",
+      "-o", "foo.md"
+   ]
+  }
+  ```
+
+    * `args`: Pandoc command line parameters
+* Return value
+
+  ```json
+  {
+    "code": 0,
+    "msg": "",
+    "data": null
+  }
+  ```
+
 ## Notification
 
 ### Push message

API_zh_CN.md

@@ -44,6 +44,8 @@
     * [列出文件](#列出文件)
 * [导出](#导出)
     * [导出 Markdown 文本](#导出-markdown-文本)
+* [转换](#转换)
+    * [Pandoc](#Pandoc)
 * [通知](#通知)
     * [推送消息](#推送消息)
     * [推送报错消息](#推送报错消息)
@@ -1008,6 +1010,41 @@
     * `hPath`：人类可读的路径
     * `content`：Markdown 内容
 
+## 转换
+
+### Pandoc
+
+* `/api/convert/pandoc`
+* 工作目录
+    * 执行调用 pandoc 命令时工作目录会被设置在 `工作空间/temp/convert/pandoc/` 下
+    * 可先通过 API [`写入文件`](#写入文件) 将待转换文件写入该目录
+    * 然后再调用该 API 进行转换，转换后的文件也会被写入该目录
+    * 最后调用 API [`获取文件`](#获取文件) 获取转换后的文件内容
+        * 或者调用 API [`通过 Markdown 创建文档`](#通过-markdown-创建文档)
+        * 或者调用内部 API `importStdMd` 将转换后的文件夹直接导入
+* 参数
+
+  ```json
+  {
+    "args": [
+      "--to", "markdown_strict-raw_html",
+      "foo.epub",
+      "-o", "foo.md"
+   ]
+  }
+  ```
+
+    * `args`：Pandoc 命令行参数
+* 返回值
+
+  ```json
+  {
+    "code": 0,
+    "msg": "",
+    "data": null
+  }
+  ```
+
 ## 通知
 
 ### 推送消息

kernel/api/pandoc.go

@@ -0,0 +1,49 @@
+// SiYuan - Build Your Eternal Digital Garden
+// Copyright (c) 2020-present, b3log.org
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package api
+
+import (
+	"net/http"
+
+	"github.com/88250/gulu"
+	"github.com/gin-gonic/gin"
+	"github.com/siyuan-note/siyuan/kernel/util"
+)
+
+func pandoc(c *gin.Context) {
+	ret := gulu.Ret.NewResult()
+	defer c.JSON(http.StatusOK, ret)
+
+	arg, ok := util.JsonArg(c, ret)
+	if !ok {
+		return
+	}
+
+	pandocArgs := arg["args"].([]interface{})
+	var args []string
+	for _, v := range pandocArgs {
+		args = append(args, v.(string))
+	}
+
+	err := util.ConvertPandoc(args...)
+	if nil != err {
+		ret.Code = -1
+		ret.Msg = err.Error()
+		return
+	}
+	return
+}

kernel/api/router.go

@@ -259,6 +259,8 @@ func ServeAPI(ginServer *gin.Engine) {
 	ginServer.Handle("POST", "/api/import/importData", model.CheckAuth, model.CheckReadonly, importData)
 	ginServer.Handle("POST", "/api/import/importSY", model.CheckAuth, model.CheckReadonly, importSY)
 
+	ginServer.Handle("POST", "/api/convert/pandoc", model.CheckAuth, model.CheckReadonly, pandoc)
+
 	ginServer.Handle("POST", "/api/template/render", model.CheckAuth, renderTemplate)
 	ginServer.Handle("POST", "/api/template/docSaveAsTemplate", model.CheckAuth, model.CheckReadonly, docSaveAsTemplate)
 	ginServer.Handle("POST", "/api/template/renderSprig", model.CheckAuth, model.CheckReadonly, renderSprig)

kernel/util/pandoc.go

@@ -18,6 +18,8 @@ package util
 
 import (
 	"bytes"
+	"errors"
+	"os"
 	"os/exec"
 	"path/filepath"
 	"strings"
@@ -26,6 +28,27 @@ import (
 	"github.com/siyuan-note/logging"
 )
 
+func ConvertPandoc(args ...string) (err error) {
+	if "" == PandocBinPath || ContainerStd != Container {
+		return errors.New("not found executable pandoc")
+	}
+
+	pandoc := exec.Command(PandocBinPath, args...)
+	gulu.CmdAttr(pandoc)
+	dir := filepath.Join(WorkspaceDir, "temp", "convert", "pandoc")
+	if err = os.MkdirAll(dir, 0755); nil != err {
+		logging.LogErrorf("mkdir [%s] failed: [%s]", dir, err)
+		return
+	}
+	pandoc.Dir = dir
+	output, err := pandoc.CombinedOutput()
+	if nil != err {
+		logging.LogErrorf("pandoc convert output [%s]", string(output))
+		return
+	}
+	return
+}
+
 func Pandoc(from, to, o, content string) (ret string, err error) {
 	if "" == from || "" == to || "md" == to {
 		ret = content