Revert "Delete and de-list snap because it no longer works"

This reverts commit 3a721e6.

README.md

@@ -75,6 +75,7 @@ Linux, Windows, macOS and FreeBSD are supported. Docker images are also availabl
 | LinuxBrew                     | ``brew install ocrmypdf``     |
 | FreeBSD                       | ``pkg install py-ocrmypdf``   |
 | Conda                         | ``conda install ocrmypdf``    |
+| Ubuntu Snap                   | ``snap install ocrmypdf``     |
 
 For everyone else, [see our documentation](https://ocrmypdf.readthedocs.io/en/latest/installation.html) for installation steps.
 

docs/installation.rst

@@ -33,6 +33,8 @@ These platforms have one-liner installs:
 +-------------------------------+-----------------------------------------+
 | Conda (WSL, macOS, Linux)     | ``conda install ocrmypdf``              |
 +-------------------------------+-----------------------------------------+
+| Snap (snapcraft packaging)    | ``snap install ocrmypdf``               |
++-------------------------------+-----------------------------------------+
 
 More detailed procedures are outlined below. If you want to do a manual
 install, or install a more recent version than your platform provides, read on.
@@ -339,7 +341,7 @@ OCRmyPDF is includes in MacPorts:
     sudo port install ocrmypdf
 
 Note that while this will install tesseract you will need to install
-the appropriate tesseract `language ports <https://ports.macports.org/search/?selected_facets=categories_exact%3Atextproc&installed_file=&q=tesseract&name=on>`__.
+the appropriate tesseract `language ports <https://ports.macports.org/search/?selected_facets=categories_exact%3Atextproc&installed_file=&q=tesseract&name=on>`__. 
 
 Manual installation on macOS
 ----------------------------

docs/jbig2.rst

@@ -22,6 +22,7 @@ specification since 2001.
 
 JBIG encoding is automatically provided by these OCRmyPDF packages:
 - Docker image (both Ubuntu and Alpine)
+- Snap package
 - ArchLinux AUR package
 - Alpine Linux package
 - Homebrew on macOS

snapcraft.yaml

@@ -0,0 +1,94 @@
+# SPDX-FileCopyrightText: 2022 Alexander Langanke
+# SPDX-FileCopyrightText: 2022 James R. Barlow
+# SPDX-FileCopyrightText: 2023 林博仁(Buo-ren, Lin) <[email protected]>
+# SPDX-License-Identifier: MPL-2.0
+
+name: ocrmypdf
+title: OCRmyPDF
+base: core22
+version: git
+summary: OCRmyPDF adds a searchable text layer to scanned PDF files
+description: OCRmyPDF packaged for snap
+grade: stable
+confinement: strict
+icon: docs/images/logo-square-256.svg
+license: MPL-2.0
+
+architectures: [amd64]
+
+environment:
+  TESSDATA_PREFIX: $SNAP/usr/share/tesseract-ocr/4.00/tessdata
+  GS_LIB: $SNAP/usr/share/ghostscript/9.55/Resource/Init
+  GS_FONTPATH: $SNAP/usr/share/ghostscript/9.55/Resource/Font
+  LD_LIBRARY_PATH: $SNAP/usr/lib/x86_64-linux-gnu
+
+apps:
+  ocrmypdf:
+    command: usr/bin/snapcraft-preload python3 -m ocrmypdf
+    plugs:
+      - desktop
+      - desktop-legacy
+      - wayland
+      - x11
+      - home
+      - removable-media
+
+parts:
+  snapcraft-preload:
+    source: https://github.com/sergiusens/snapcraft-preload.git
+    plugin: cmake
+    cmake-parameters:
+      - -DCMAKE_INSTALL_PREFIX=/usr -DLIBPATH=/usr/lib
+    build-packages:
+      - on amd64:
+          - gcc-multilib
+          - g++-multilib
+    stage-packages:
+      - lib32stdc++6
+
+  jbig2enc:
+    plugin: autotools
+    source: https://github.com/agl/jbig2enc.git
+    source-tag: "0.29"
+    build-packages:
+      - libleptonica-dev
+
+  ocrmypdf:
+    plugin: python
+    source: .
+
+    build-packages:
+      - python3-pip
+
+    stage-packages:
+      - ghostscript
+      - icc-profiles-free
+      - liblept5
+      - libxml2
+      - pngquant
+      - tesseract-ocr-all
+      - unpaper
+      - qpdf
+      - zlib1g
+
+    python-packages:
+      - cffi
+      - pdfminer.six
+      - pikepdf
+      - Pillow
+      - pluggy
+      - reportlab
+      - setuptools
+      - tqdm
+      - pipe
+      - wheel
+
+    override-build: |
+      pip3 install --user dephell[full]
+      $HOME/.local/bin/dephell deps convert \
+          --from-path pyproject.toml \
+          --from-format pyproject \
+          --to-path setup.py \
+          --to-format setuppy
+      snapcraftctl build
+      ln -sf ../usr/lib/libsnapcraft-preload.so $SNAPCRAFT_PART_INSTALL/lib/libsnapcraft-preload.so