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Add AppImage generator for YACReader and YACReaderLibrary
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‎appimage/README.md‎

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# AppImage
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To build the AppImages of `YACReader` and `YACReaderLibrary`, podman or docker is required using an ubuntu base image of 20.04:
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```
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podman pull ubuntu:20.04
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podman run --device=/dev/fuse --cap-add SYS_ADMIN --cap-add MKNOD --tmpfs /tmp:exec -v ./:/tmp/out --rm -ti ubuntu:20.04 /tmp/out/appimage.sh
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```
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The resulting AppImages will be placed in this directory.
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## YACReader.c
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`YACReaderLibrary` when trying to open `YACReader` will call this wrapper which will attempt to find the closest `YACReader` AppImage, then look into `PATH` and finally try to locate `YACReader` in the system if all else fails.

‎appimage/YACReader.c‎

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#include <limits.h>
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#include <stdlib.h>
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#include <limits.h>
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#include <string.h>
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#include <libgen.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <errno.h>
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int main(int argc, char *argv[]) {
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char tmp[PATH_MAX], exe_base[NAME_MAX+1], exe_dir[PATH_MAX];
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strncpy(tmp, argv[0], PATH_MAX);
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strncpy(exe_base, basename(tmp), NAME_MAX+1);
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strncpy(tmp, argv[0], PATH_MAX);
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strncpy(exe_dir, dirname(tmp), PATH_MAX);
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const char *appimage_path = getenv("APPIMAGE");
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if (appimage_path && *appimage_path) {
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char ai_base[NAME_MAX+1], ai_dir[PATH_MAX];
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strncpy(tmp, appimage_path, PATH_MAX);
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strncpy(ai_base, basename(tmp), NAME_MAX+1);
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strncpy(tmp, appimage_path, PATH_MAX);
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strncpy(ai_dir, dirname(tmp), PATH_MAX);
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char *ai_last_part = strrchr(ai_base, '-');
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if (!ai_last_part || !*ai_last_part)
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ai_last_part = strrchr(ai_base, '.');
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if (ai_last_part && *ai_last_part) {
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snprintf(tmp, PATH_MAX, "%s/%s%s", ai_dir, exe_base, ai_last_part);
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argv[0] = tmp;
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execvp(argv[0], argv);
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if (errno != ENOENT)
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return 1;
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argv[0] = basename(tmp);
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execvp(argv[0], argv);
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if (errno != ENOENT)
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return 1;
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}
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snprintf(tmp, PATH_MAX, "%s/%s", ai_dir, exe_base);
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argv[0] = tmp;
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execvp(argv[0], argv);
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if (errno != ENOENT)
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return 1;
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}
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const char *env_path = getenv("PATH");
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if (!env_path || !*env_path)
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return 1;
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char exe_dir_rp[PATH_MAX];
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if (!realpath(exe_dir, exe_dir_rp))
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return 1;
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char env_path_cp[PATH_MAX];
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strncpy(env_path_cp, env_path, PATH_MAX);
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char ep_rp[PATH_MAX];
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for (char *p = strtok(env_path_cp, ":"); p ; p = strtok(NULL, ":")) {
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if (!realpath(p, ep_rp))
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continue;
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if (strcmp(exe_dir_rp, ep_rp)) {
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snprintf(tmp, PATH_MAX, "%s/%s", ep_rp, exe_base);
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argv[0] = tmp;
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execvp(argv[0], argv);
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if (errno != ENOENT)
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return 1;
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}
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}
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return 1;
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}

‎appimage/appimage.sh‎

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#!/bin/bash
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#podman pull ubuntu:20.04
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#podman run --device=/dev/fuse --cap-add SYS_ADMIN --cap-add MKNOD --tmpfs /tmp:exec -v ./:/tmp/out --rm -ti ubuntu:20.04 /tmp/out/appimage.sh
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set -ex
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OUT_DIR=/tmp/out
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DEST=/usr/local
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YACREADER_GIT_URL='https://github.com/YACReader/yacreader.git'
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YACREADER_GIT_TAG='9.8.2.2106204'
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UNARR_GIT_URL='https://github.com/selmf/unarr.git'
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UNARR_GIT_COMMIT='e6fb85e8cdd1b1f9086e6e42be8d385f44136faa'
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GN_GIT_URL='https://gn.googlesource.com/gn'
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GN_GIT_COMMIT='80a40b07305373617eba2d5878d353532af77da3'
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PDFIUM_GIT_URL='https://pdfium.googlesource.com/pdfium'
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# curl -sSL 'https://omahaproxy.appspot.com/linux?channel=stable' | cut -d'.' -f 3
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PDFIUM_GIT_VERSION='4896'
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PDFIUM_GIT_BRANCH="chromium/$PDFIUM_GIT_VERSION"
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PDFIUM_BUILD_GIT_URL='https://chromium.googlesource.com/chromium/src/build.git'
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# awk '/build_revision/ {print substr($2,2,40)}' pdfium/DEPS
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PDFIUM_BUILD_GIT_COMMIT='893ac785aa454dcf84dcc26af1a410095c1d4fa2'
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PDFIUM_ABSEIL_CPP_GIT_URL='https://chromium.googlesource.com/chromium/src/third_party/abseil-cpp'
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# awk '/abseil_revision/ {print substr($2,2,40)}' pdfium/DEPS
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PDFIUM_ABSEIL_CPP_GIT_COMMIT='9ffdb583473a319b3920c752badde40f91ffd609'
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# building in temporary directory to keep system clean
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# use RAM disk if possible (as in: not building on CI system like Travis, and RAM disk is available)
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# if [[ -z "$CI" ]] && [[ -d /dev/shm ]]; then
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# TEMP_BASE=/dev/shm
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# else
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# TEMP_BASE=/tmp
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# fi
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TEMP_BASE=/tmp
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BUILD_DIR="$(mktemp -d -p "$TEMP_BASE" appimage-build-XXXXXX)"
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# make sure to clean up build dir, even if errors occur
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cleanup() {
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if [[ -d "$BUILD_DIR" ]]; then
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rm -rf "$BUILD_DIR"
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fi
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}
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trap cleanup EXIT
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cd "$BUILD_DIR"
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export DEBIAN_FRONTEND=noninteractive
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apt -q -y update && apt -q -y upgrade
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apt -q -y install build-essential \
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cmake \
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curl \
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fuse \
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git \
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libbz2-dev \
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libfreetype-dev \
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libfuse2 \
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libicu-dev \
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liblcms2-dev \
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liblzma-dev \
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libopenjp2-7-dev \
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libqt5multimedia5-plugins \
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libqt5network5 \
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libqt5sql5-sqlite \
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libqt5svg5-dev \
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libturbojpeg0-dev \
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mesa-common-dev \
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ninja-build \
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pkg-config \
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python3 \
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qt5-image-formats-plugins \
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qt5-qmake \
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qtbase5-dev \
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qtdeclarative5-dev \
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qtmultimedia5-dev \
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qtquickcontrols2-5-dev
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# source the default compiler flags
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eval $(dpkg-buildflags --export=sh)
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# for gn
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export CC=gcc CXX=g++
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# compile and install libunarr
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git clone "$UNARR_GIT_URL" unarr
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cd unarr
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git checkout "$UNARR_GIT_COMMIT"
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cmake -DENABLE_7Z=ON -DCMAKE_INSTALL_PREFIX="$DEST" -DCMAKE_INSTALL_LIBDIR=lib .
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make -j$(nproc)
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make install
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cd ..
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# regenerate dynamic linker cache
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ldconfig
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# compile and install gn
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git clone "$GN_GIT_URL" gn
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cd gn
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git checkout "$GN_GIT_COMMIT"
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./build/gen.py
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ninja -C out
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strip -s out/gn
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install -D out/gn "$DEST"/bin/gn
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cd ..
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# https://aur.archlinux.org/cgit/aur.git/tree/PKGBUILD?h=libpdfium-nojs
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# compile and install pdfium
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git clone --branch "$PDFIUM_GIT_BRANCH" --depth 1 "$PDFIUM_GIT_URL" pdfium
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git clone "$PDFIUM_BUILD_GIT_URL" pdfium/build
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git -C pdfium/build checkout "$PDFIUM_BUILD_GIT_COMMIT"
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# awk '/abseil_revision/ {print substr($2,2,40)}' pdfium/DEPS
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git clone "$PDFIUM_ABSEIL_CPP_GIT_URL" pdfium/third_party/abseil-cpp
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git -C pdfium/third_party/abseil-cpp checkout "$PDFIUM_ABSEIL_CPP_GIT_COMMIT"
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# Download and decode shim header script needed to unbundle icu (gittiles is weird)
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mkdir -p pdfium/tools/generate_shim_headers
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curl -sSL https://chromium.googlesource.com/chromium/src/+/master/tools/generate_shim_headers/generate_shim_headers.py?format=TEXT | base64 -d > pdfium/tools/generate_shim_headers/generate_shim_headers.py
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curl -sSL https://aur.archlinux.org/cgit/aur.git/plain/libpdfium.pc?h=libpdfium-nojs > libpdfium.pc
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# Fix visibility for system Freetype
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git -C pdfium/build cherry-pick -n bfd6ff0
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# Patch abseil build to be static
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sed -i -e 's/component(/static_library(/' -e 's/is_component_build(/false/' pdfium/third_party/abseil-cpp/BUILD.gn
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# Use system provided icu library (unbundling)
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mkdir -p pdfium/third_party/icu
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ln -sf ../../build/linux/unbundle/icu.gn pdfium/third_party/icu/BUILD.gn
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# Create fake gclient_args.gni file to satisfy include list for build/config/compiler/compiler.gni
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touch pdfium/build/config/gclient_args.gni
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# Exclude test fonts from build
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sed -i '/"\/\/third_party\/test_fonts",/s/^/#/g' pdfium/testing/BUILD.gn
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# Build
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gn --root=pdfium gen pdfium/out/Release --args="is_clang=false use_sysroot=false is_debug=false symbol_level=0 pdf_enable_v8=false pdf_enable_xfa=false treat_warnings_as_errors=false use_system_libjpeg=true use_system_zlib=true pdf_bundle_freetype=false use_system_freetype=true use_system_lcms2=true use_system_libpng=true use_custom_libcxx=false pdf_is_standalone=true use_system_libopenjpeg2=true is_component_build=true use_gold=false"
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ninja -C pdfium/out/Release pdfium
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sed -e 's/@VERSION@/'"$PDFIUM_GIT_VERSION"'/g' -e 's#^\s*prefix\s*=.*$#prefix='"$DEST"'#' -i libpdfium.pc
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# Install
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install -D -m644 pdfium/LICENSE "$DEST/share/licenses/pdfium/LICENSE"
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install -D pdfium/public/*.h --target-directory="$DEST/include/pdfium"
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install -D pdfium/public/cpp/* --target-directory="$DEST/include/pdfium/cpp"
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install -D pdfium/docs/* --target-directory="$DEST/share/doc/pdfium"
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install -Dm755 pdfium/out/Release/libpdfium.so --target-directory="$DEST/lib"
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install -Dm644 libpdfium.pc --target-directory="$DEST/lib/pkgconfig"
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# regenerate dynamic linker cache
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ldconfig
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# compile and install YACReader
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git clone --branch "$YACREADER_GIT_TAG" --depth 1 "$YACREADER_GIT_URL" yacreader
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cd yacreader
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qmake CONFIG+="unarr pdfium server_bundled"
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make -j$(nproc)
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mkdir -p "$BUILD_DIR"/AppDir{YACReader,YACReaderLibrary}
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make sub-YACReader-install_subtargets INSTALL_ROOT="$BUILD_DIR/AppDirYACReader"
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make sub-YACReaderLibrary-install_subtargets INSTALL_ROOT="$BUILD_DIR/AppDirYACReaderLibrary"
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cd ..
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# compile wrapper for YACReaderLibrary in order to find YACReader
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gcc $CFLAGS $LDFLAGS -o "$BUILD_DIR/AppDirYACReaderLibrary/usr/bin/YACReader" "$OUT_DIR/YACReader.c"
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strip -s "$BUILD_DIR/AppDirYACReaderLibrary/usr/bin/YACReader"
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# use a custom plugin to set the PATH inside the appimage and find the YACReader wrapper
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cp "$OUT_DIR/linuxdeploy-plugin-path.sh" .
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# create appimages
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curl -sSLo linuxdeploy-x86_64.AppImage https://github.com/linuxdeploy/linuxdeploy/releases/download/continuous/linuxdeploy-x86_64.AppImage
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chmod +x linuxdeploy-x86_64.AppImage
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curl -sSLo linuxdeploy-plugin-qt-x86_64.AppImage https://github.com/linuxdeploy/linuxdeploy-plugin-qt/releases/download/continuous/linuxdeploy-plugin-qt-x86_64.AppImage
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chmod +x linuxdeploy-plugin-qt-x86_64.AppImage
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curl -sSLo linuxdeploy-plugin-appimage-x86_64.AppImage https://github.com/linuxdeploy/linuxdeploy-plugin-appimage/releases/download/continuous/linuxdeploy-plugin-appimage-x86_64.AppImage
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chmod +x linuxdeploy-plugin-appimage-x86_64.AppImage
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./linuxdeploy-x86_64.AppImage --appdir AppDirYACReader \
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--executable AppDirYACReader/usr/bin/YACReader \
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--desktop-file AppDirYACReader/usr/share/applications/YACReader.desktop \
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--icon-file AppDirYACReader/usr/share/icons/hicolor/scalable/apps/YACReader.svg \
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--plugin qt \
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--output appimage
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./linuxdeploy-x86_64.AppImage --appdir AppDirYACReaderLibrary \
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--executable AppDirYACReaderLibrary/usr/bin/YACReaderLibrary \
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--desktop-file AppDirYACReaderLibrary/usr/share/applications/YACReaderLibrary.desktop \
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--icon-file AppDirYACReaderLibrary/usr/share/icons/hicolor/scalable/apps/YACReaderLibrary.svg \
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--plugin qt \
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--plugin path \
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--output appimage
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mv YACReader*.AppImage "$OUT_DIR"

‎appimage/linuxdeploy-plugin-path.sh‎

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#! /bin/bash
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# exit whenever a command called in this script fails
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set -e
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appdir=""
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show_usage() {
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echo "Usage: bash $0 --appdir <AppDir>"
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}
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while [ "$1" != "" ]; do
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case "$1" in
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--plugin-api-version)
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echo "0"
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exit 0
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;;
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--appdir)
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appdir="$2"
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shift
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shift
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;;
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*)
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echo "Invalid argument: $1"
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echo
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show_usage
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exit 2
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esac
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done
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if [[ "$appdir" == "" ]]; then
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show_usage
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exit 2
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fi
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echo "linuxdeploy-plugin-path"
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echo "\$LINUXDEPLOY: \"$LINUXDEPLOY\""
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# install a path AppRun hook
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# usually, they're not supposed to print anything, but remain as silent as possible
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set -x
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mkdir -p "$appdir"/apprun-hooks
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cat > "$appdir"/apprun-hooks/linuxdeploy-plugin-path.sh <<\EOF
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export PATH="$APPDIR/usr/bin:$PATH"
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EOF

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