mediawiki/pandoc: call directly instead of via lib

Pandoc crate is confusing and badly documented.
Using std::process::command now to avoid temporary files.

Cargo.toml

@@ -5,7 +5,6 @@ edition = "2021"
 
 [dependencies]
 stdext = "0.3.3"
-pandoc = "0.8"
 chrono = "0.4.38"
 regex = "1.10.5"
 futures = "0.3.30"

src/mediawiki.rs

@@ -1,10 +1,10 @@
+use std::cell::OnceCell;
 use std::error::Error;
 use std::fs::File;
-use std::io::Read;
-use std::cell::OnceCell;
+use std::io::{Read, Write};
+use std::process::{Command, Output, Stdio};
 
 use colored::Colorize;
-use pandoc::{PandocError, PandocOutput};
 use reqwest::blocking::Client;
 use serde::Deserialize;
 use serde_json::json;
@@ -283,18 +283,41 @@ pub fn pad_ins_wiki(old_pad_content: String, wiki: &Mediawiki) -> Result<(), Box
 }
 
 /// Converts one file type into another using pandoc and saves the result as a txt file
-fn pandoc_convert(
-    old_pad_content: String, output_filepath: &str, input_format: pandoc::InputFormat,
-    output_format: pandoc::OutputFormat,
-) -> Result<PandocOutput, PandocError> {
+fn pandoc_convert(old_pad_content: String) -> Result<String, Box<dyn Error>> {
+    let mut cmd = Command::new("pandoc")
+        .args(["--from", "markdown", "--to", "mediawiki", "--no-highlight"])
+        .stdin(Stdio::piped())
+        .stdout(Stdio::piped())
+        .stderr(Stdio::piped())
+        .spawn()?;
+    if let Some(mut stdin) = cmd.stdin.take() {
+        stdin.write_all(old_pad_content.as_bytes())?;
+    }
+    let mut output = String::new();
+    if let Some(mut stdout) = cmd.stdout.take() {
+        stdout.read_to_string(&mut output)?;
+    }
+    let mut errmsg = String::new();
+    if let Some(mut stderr) = cmd.stderr.take() {
+        stderr.read_to_string(&mut errmsg)?;
+    }
+    let status = cmd.wait()?;
+    if status.success() {
+        Ok(output)
+    } else {
+        Err( format!("Pandoc error, exit {:?}\n{}", status, errmsg).into() )
+    }
+    /*
     //Convert Markdown into Mediawiki
     // Vanilla pandoc Befehl: pandoc --from markdown --to mediawiki --no-highlight
     let mut p = pandoc::new();
     p.set_input(pandoc::InputKind::Pipe(old_pad_content));
     p.set_input_format(input_format, vec![]);
-    p.set_output(pandoc::OutputKind::File(output_filepath.parse().unwrap()));
+    p.set_output(pandoc::OutputKind::Pipe); // File(output_filepath.parse().unwrap()));
     p.set_output_format(output_format, vec![]);
-    p.execute()
+    let output = p.execute()?;
+    Ok(output.into())
+    */
 }
 
 
@@ -313,7 +336,8 @@ fn convert_md_to_mediawiki(old_pad_content: String) -> String {
     // TODO: use tempfile="3.3", make it a NamedTempFile::new()?;
     //       or alternatively use piped stdout to avoid files entirely
     let output_filepath: &str = "./pandoc_mediawiki.txt";
-    pandoc_convert(old_pad_content, output_filepath, pandoc::InputFormat::Markdown, pandoc::OutputFormat::MediaWiki).expect("Fehler beim Umwandeln des und speichern des Pads in eine mediawiki-Textdatei");
+    pandoc_convert(old_pad_content)
+    .expect("Fehler beim Umwandeln des und speichern des Pads in eine mediawiki-Textdatei");
     let temp = read_txt_file(output_filepath);
     println!("TEMP: {}", temp.purple());
     temp