add adapters list to readme

README.md

@@ -28,6 +28,64 @@ demo/
 
 ![rga output](doc/demodir.png)
 
+## Available Adapters
+
+```
+rga --rga-list-adapters
+```
+
+Adapters:
+
+-   ffmpeg
+
+    Uses ffmpeg to extract video metadata/chapters and subtitles
+
+    Extensions: .mkv, .mp4, .avi
+
+-   pandoc
+
+    Uses pandoc to convert binary/unreadable text documents to plain markdown-like text
+
+    Extensions: .epub, .odt, .docx, .fb2, .ipynb
+
+-   poppler
+
+    Uses pdftotext (from poppler-utils) to extract plain text from PDF files
+
+    Extensions: .pdf
+
+-   zip
+
+    Reads a zip file as a stream and recurses down into its contents
+
+    Extensions: .zip
+
+-   tar
+
+    Reads a tar file as a stream and recurses down into its contents
+
+    Extensions: .tar, .tar.gz, .tar.bz2, .tar.xz, .tar.zst
+
+-   sqlite
+
+    Uses sqlite bindings to convert sqlite databases into a simple plain text format
+
+    Extensions: .db, .db3, .sqlite, .sqlite3
+
+    Mime Types: application/x-sqlite3
+
+The following adapters are disabled by default, and can be enabled using `--rga-adapters=+pdfpages,tesseract`:
+
+-   pdfpages
+    Converts a pdf to it's individual pages as png files. Only useful in combination with tesseract
+
+    Extensions: .pdf
+
+-   tesseract
+    Uses tesseract to run OCR on images to make them searchable. May need -j1 to prevent overloading the system. Make sure you have tesseract installed.
+
+    Extensions: .jpg, .png
+
 ## USAGE:
 
 > rga \[FLAGS\] \[OPTIONS\] PATTERN \[PATH ...\]

src/bin/rga.rs

@@ -27,9 +27,28 @@ fn main() -> Fallible<()> {
                 })
                 .collect::<Vec<_>>()
                 .join(", ");
+            let slow_matchers = meta
+                .slow_matchers
+                .as_ref()
+                .unwrap_or(&vec![])
+                .iter()
+                .filter_map(|m| match m {
+                    SlowMatcher::MimeType(x) => Some(format!("{}", x)),
+                    SlowMatcher::Fast(_) => None,
+                })
+                .collect::<Vec<_>>()
+                .join(", ");
+            let mime_text = if slow_matchers.is_empty() {
+                "".to_owned()
+            } else {
+                format!("Mime Types: {}", slow_matchers)
+            };
             print!(
-                " - {}\n     {}\n     Extensions: {}\n",
-                meta.name, meta.description, matchers
+                " - {name}\n     {desc}\n     Extensions: {matchers}\n     {mime}\n",
+                name = meta.name,
+                desc = meta.description,
+                matchers = matchers,
+                mime = mime_text
             );
             println!("");
         };