Some documentation updates

README.md

@@ -50,7 +50,8 @@ sist2 (Simple incremental search tool)
         ```
 1. Download sist2 executable
     1. Download the [latest sist2 release](https://github.com/simon987/sist2/releases) *
-    1. *(or)* Download a [development snapshot](https://files.simon987.net/.gate/sist2/simon987_sist2/) *(Not recommended!)*
+    1. *(or)* Download a [development snapshot](https://files.simon987.net/.gate/sist2/simon987_sist2/) *(Not
+       recommended!)*
     1. *(or)* `docker pull simon987/sist2:2.11.2-x64-linux`
 
 1. See [Usage guide](docs/USAGE.md)
@@ -70,19 +71,20 @@ See [Usage guide](docs/USAGE.md) for more details
 File type | Library | Content | Thumbnail | Metadata
 :---|:---|:---|:---|:---
 pdf,xps,fb2,epub | MuPDF | text+ocr | yes | author, title |
-cbz,cbr | *(none)* | - | yes | - |
+cbz,cbr | [libscan](https://github.com/simon987/libscan) | - | yes | - |
 `audio/*` | ffmpeg | - | yes | ID3 tags |
 `video/*` | ffmpeg | - | yes | title, comment, artist |
 `image/*` | ffmpeg | - | yes | [Common EXIF tags](https://github.com/simon987/sist2/blob/efdde2734eca9b14a54f84568863b7ffd59bdba3/src/parsing/media.c#L190), GPS tags |
 raw, rw2, dng, cr2, crw, dcr, k25, kdc, mrw, pef, xf3, arw, sr2, srf, erf  | LibRaw | - | yes | Common EXIF tags, GPS tags |
 ttf,ttc,cff,woff,fnt,otf | Freetype2 | - | yes, `bmp` | Name & style |
-`text/plain` | *(none)* | yes | no | - |
+`text/plain` | [libscan](https://github.com/simon987/libscan) | yes | no | - |
-html, xml | *(none)* | yes | no | - |
+html, xml | [libscan](https://github.com/simon987/libscan) | yes | no | - |
 tar, zip, rar, 7z, ar ...  | Libarchive | yes\* | - | no |
-docx, xlsx, pptx | *(none)* | yes | if embedded | creator, modified_by, title |
+docx, xlsx, pptx | [libscan](https://github.com/simon987/libscan) | yes | if embedded | creator, modified_by, title |
 doc (MS Word 97-2003) | antiword | yes | yes | author, title |
 mobi, azw, azw3 | libmobi | yes | no | author, title |
 wpd (WordPerfect) | libwpd | yes | no | *planned* |
+json, jsonl, ndjson | [libscan](https://github.com/simon987/libscan) | yes | - | - |
 
 \* *See [Archive files](#archive-files)*
 

docs/USAGE.md

@@ -49,6 +49,7 @@ Scan options
     --mem-buffer=<int>            Maximum memory buffer size per thread in MB for files inside archives (see USAGE.md). DEFAULT: 2000
     --read-subtitles              Read subtitles from media files.
     --fast-epub                   Faster but less accurate EPUB parsing (no thumbnails, metadata)
+    --checksums                   Calculate file checksums when scanning.
 
 Index options
     -t, --threads=<int>           Number of threads. DEFAULT=1
@@ -129,6 +130,9 @@ Exec-script options
     To check if a media file can be parsed without *seek*, execute `cat file.mp4 | ffprobe -`
 * `--read-subtitles` When enabled, will attempt to read the subtitles stream from media files.
 * `--fast-epub` Much faster but less accurate EPUB parsing. When enabled, sist2 will use a simple HTML parser to read epub files instead of the MuPDF library. No thumbnails are generated and author/title metadata are not parsed.
+* `--checksums` Calculate file checksums (sha1) when scanning files. This option does not cause any additional read 
+  operations. Checksums are not calculated for all file types, unless the file is inside an archive. When enabled, duplicate
+  files are hidden in the web UI (this behaviour can be toggled in the Configuration page).
 
 ### Scan examples