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+#!/bin/bash
+# $Id$
+# Copyright 2023  Eric Hameleers, Eindhoven, NL
+# All rights reserved.
+#
+#   Permission to use, copy, modify, and distribute this software for
+#   any purpose with or without fee is hereby granted, provided that
+#   the above copyright notice and this permission notice appear in all
+#   copies.
+#
+#   THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
+#   WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+#   MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+#   IN NO EVENT SHALL THE AUTHORS AND COPYRIGHT HOLDERS AND THEIR
+#   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+#   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+#   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+#   USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+#   ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+#   OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+#   OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+#   SUCH DAMAGE.
+# -----------------------------------------------------------------------------
+#
+# Slackware SlackBuild script 
+# ===========================
+# By:          Eric Hameleers <alien@slackware.com>
+# For:         gn
+# Descr:       meta-build system that generates build files for Ninja
+# URL:         https://gn.googlesource.com/gn/
+# Build needs: 
+# Needs:       
+# Changelog:   
+# 0.2077.5e19d2fb-1:
+#              12/Feb/2023 by Eric Hameleers <alien@slackware.com>
+#              * Initial build.
+# 
+# Run 'sh gn.SlackBuild' to build a Slackware package.
+# The package (.t?z) and .txt file as well as build logs are created in /tmp .
+# Install the package using 'installpkg' or 'upgradepkg --install-new'.
+#
+# -----------------------------------------------------------------------------
+
+PRGNAM=gn
+VERSION=${VERSION:-0.2077.5e19d2fb}
+BUILD=${BUILD:-1}
+NUMJOBS=${NUMJOBS:-" -j$(nproc) "}
+TAG=${TAG:-alien}
+
+# Versions of gn are closely tied to versions of chromium.
+# So for any version of chromium, we determine the commit and
+# related version string of the gn binary we should build.
+# The gn base version is "0.<number of commits since initial commit>" ,
+# The gn extra version is the first 8 digits of the git commit hash.
+# The chromium version we want to base a gn package on:
+CHROMIUM_VERSION=${CHROMIUM_VERSION:-"110.0.5481.77"}
+
+DOCS="LICENSE docs/*"
+
+# Where do we look for sources?
+SRCDIR=$(cd $(dirname $0); pwd)
+
+# Place to build (TMP) package (PKG) and output (OUTPUT) the program:
+TMP=${TMP:-/tmp/build}
+PKG=$TMP/package-$PRGNAM
+OUTPUT=${OUTPUT:-/tmp}
+
+# If you want automatic download to work, supply a URL for 'SRCURL' below:
+SOURCE="$SRCDIR/${PRGNAM}-${VERSION}.tar.xz"
+SRCURL=""
+
+# Use the src_checkout() function if no downloadable tarball exists.
+# Check out sources from GIT and create a tarball of them.
+src_checkout() {
+  # Param #1 : index in the SOURCE[] array.
+  # Param #2 : full path to where SOURCE[$1] tarball should be created.
+  # Determine the tarball extension:
+  PEXT=$(echo "${2}" | sed -r -e 's/.*[^.].(tar.xz|tar.gz|tar.bz2|tgz).*/\1/')
+  case "$PEXT" in
+    "tar.xz") TARCOMP="J" ;;
+    "tar.gz") TARCOMP="z" ;;
+    "tgz") TARCOMP="z" ;;
+    "tar.bz2") TARCOMP="j" ;;
+    *) echo "Archive can only have extension 'tar.xz', '.tar.gz' '.tar.bz2' or '.tgz'" ; exit 1 ;;
+  esac
+  # Determine the directory name to create for the archive root:
+  PBASE=$(basename ${2} .${PEXT})
+  # Determine the directory where we create our checkout:
+  CODIR=$(dirname ${2})
+  case ${1} in
+  0) GITURI="https://gn.googlesource.com/gn"
+     BRANCH="master"
+     COMMIT=$(echo $VERSION | cut -d. -f3)
+     RETDIR=$(pwd)
+     mkdir -p $CODIR/${PRGNAM}_temp_checkout_$$ \
+       && cd $CODIR/${PRGNAM}_temp_checkout_$$
+     mkdir ${PBASE} \
+       && cd ${PBASE}
+       echo "Checking out $BRANCH at commit $COMMIT from '$GITURI':"
+       git clone ${GITURI} . \
+         && git checkout $BRANCH \
+         && git checkout $COMMIT \
+       && chown -R root:root . \
+       && cd .. \
+       && tar -${TARCOMP}cf ${2} ${PBASE}
+     cd $RETDIR
+     rm -rf $CODIR/${PRGNAM}_temp_checkout_$$ || true
+     ;;
+  *) # Do nothing
+     ;;
+  esac
+}
+
+##
+## --- with a little luck, you won't have to edit below this point --- ##
+##
+
+# Automatically determine the architecture we're building on:
+if [ -z "$ARCH" ]; then
+  case "$(uname -m)" in
+    i?86) ARCH=i586 ;;
+    arm*) readelf /usr/bin/file -A | egrep -q "Tag_CPU.*[4,5]" && ARCH=arm || ARCH=armv7hl ;;
+    # Unless $ARCH is already set, use uname -m for all other archs:
+    *) ARCH=$(uname -m) ;;
+  esac
+  export ARCH
+fi
+# Set CFLAGS/CXXFLAGS and LIBDIRSUFFIX:
+case "$ARCH" in
+  i?86)      SLKCFLAGS="-O2 -march=${ARCH} -mtune=i686"
+             SLKLDFLAGS=""; LIBDIRSUFFIX=""
+             ;;
+  x86_64)    SLKCFLAGS="-O2 -fPIC"
+             SLKLDFLAGS="-L/usr/lib64"; LIBDIRSUFFIX="64"
+             ;;
+  armv7hl)   SLKCFLAGS="-O2 -march=armv7-a -mfpu=vfpv3-d16"
+             SLKLDFLAGS=""; LIBDIRSUFFIX=""
+             ;;
+  *)         SLKCFLAGS=${SLKCFLAGS:-"-O2"}
+             SLKLDFLAGS=${SLKLDFLAGS:-""}; LIBDIRSUFFIX=${LIBDIRSUFFIX:-""}
+             ;;
+esac
+
+case "$ARCH" in
+    arm*)    TARGET=$ARCH-slackware-linux-gnueabi ;;
+    *)       TARGET=$ARCH-slackware-linux ;;
+esac
+
+# Exit the script on errors:
+set -e
+trap 'echo "$0 FAILED at line ${LINENO}" | tee $OUTPUT/error-${PRGNAM}.log' ERR
+# Catch unitialized variables:
+set -u
+P1=${1:-1}
+
+# Save old umask and set to 0022:
+_UMASK_=$(umask)
+umask 0022
+
+# Create working directories:
+mkdir -p $OUTPUT          # place for the package to be saved
+mkdir -p $TMP/tmp-$PRGNAM # location to build the source
+mkdir -p $PKG             # place for the package to be built
+rm -rf $PKG/*             # always erase old package's contents
+rm -rf $TMP/tmp-$PRGNAM/* # remove the remnants of previous build
+rm -rf $OUTPUT/{checkout,configure,make,install,error,makepkg,patch}-$PRGNAM.log
+                          # remove old log files
+
+# Source file availability:
+if ! [ -f ${SOURCE} ]; then
+  echo "Source '$(basename ${SOURCE})' not available yet..."
+  # Check if the $SRCDIR is writable at all - if not, download to $OUTPUT
+  [ -w "$SRCDIR" ] || SOURCE="$OUTPUT/$(basename ${SOURCE})"
+  if [ -f ${SOURCE} ]; then echo "Ah, found it!"; continue; fi
+  if ! [ "x${SRCURL}" == "x" ]; then
+    echo "Will download file to $(dirname $SOURCE)"
+    wget --no-check-certificate -nv -T 20 -O "${SOURCE}" "${SRCURL}" || true
+    if [ $? -ne 0 -o ! -s "${SOURCE}" ]; then
+      echo "Fail to download '$(basename ${SOURCE})'. Aborting the build."
+      mv -f "${SOURCE}" "${SOURCE}".FAIL
+      exit 1
+    fi
+  else
+    # Try if we have a GIT download routine for ${SOURCE}
+    echo "Will checkout sources to $(dirname $SOURCE)"
+    src_checkout 0 "${SOURCE}" 2>&1 > $OUTPUT/checkout-$(basename ${SOURCE}).log
+  fi
+  if [ ! -f "${SOURCE}" -o ! -s "${SOURCE}" ]; then
+    echo "File '$(basename ${SOURCE})' not available. Aborting the build."
+    exit 1
+  fi
+fi
+
+if [ "$P1" == "--download" ]; then
+  echo "Download complete."
+  echo "Check that the following match your expectations..."
+  echo "   (wait for a bit since I will do a git checkout):"
+  # In the Chromium source, determine which commit is being used for gn in DEPS:
+  GN_GIT_COMMIT=$(wget -q -O - "https://chromium.googlesource.com/chromium/src/+/${CHROMIUM_VERSION}/DEPS?format=TEXT" |base64 -d |grep -Po "'gn_version': 'git_revision:\K[^']*")
+  # Get gn sources and determine its version:
+  TMP_GN_CO=$(mktemp -d -t gngit_XXXXXX)
+  if [ ! -d ${TMP_GN_CO} ]; then
+    echo "Could not create temp directory!" ; exit 1
+  fi
+  RETDIR=$(pwd)
+  cd ${TMP_GN_CO}
+    git clone https://gn.googlesource.com/gn gn 2>/dev/null
+    cd gn
+      git checkout ${GN_GIT_COMMIT} 2>/dev/null
+      GN_VERSION="0.$(git rev-list --count initial-commit..).$(git rev-parse --short=8 HEAD)"
+  cd $RETDIR
+  rm -rf "${TMP_GN_CO}"
+  echo ">> Current online version: ${GN_VERSION}"
+  echo ">> GN SlackBuild version:  $VERSION"
+  exit 0
+fi
+
+# --- PACKAGE BUILDING ---
+
+echo "++"
+echo "|| $PRGNAM-$VERSION"
+echo "++"
+
+cd $TMP/tmp-$PRGNAM
+echo "Extracting the source archive(s) for $PRGNAM..."
+tar -xvf ${SOURCE}
+cd ${PRGNAM}-${VERSION}
+chown -R root:root .
+chmod -R u+w,go+r-w,a+rX-st .
+
+echo Building ...
+export LDFLAGS="$SLKLDFLAGS"
+export CXXFLAGS="$SLKCFLAGS"
+export CFLAGS="$SLKCFLAGS"
+
+python3 build/gen.py --no-strip --allow-warnings \
+  2>&1 | tee $OUTPUT/configure-${PRGNAM}.log
+
+# Compile and install:
+ninja -C out gn \
+  2>&1 | tee $OUTPUT/make-${PRGNAM}.log
+install -D -m0755 -t $PKG/usr/bin/ out/gn
+
+# Add vim support files:
+mkdir -p $PKG/usr/share/vim/vimfiles
+cp -a misc/vim/{autoload,ftdetect,ftplugin,syntax} $PKG/usr/share/vim/vimfiles/
+
+# Add emacs support files:
+install -D -m0644 -t $PKG/usr/share/emacs/site-lisp misc/emacs/gn-mode.el
+
+# Add documentation:
+mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
+cp -a $DOCS $PKG/usr/doc/$PRGNAM-$VERSION || true
+cat $SRCDIR/$(basename $0) > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild
+chown -R root:root $PKG/usr/doc/$PRGNAM-$VERSION
+find $PKG/usr/doc -type f -exec chmod 644 {} \;
+
+# Compress the man page(s) if any:
+if [ -d $PKG/usr/man ]; then
+  find $PKG/usr/man -type f -name "*.?" -exec gzip -9f {} \;
+  for i in $(find $PKG/usr/man -type l -name "*.?") ; do ln -s $( readlink $i ).gz $i.gz ; rm $i ; done
+fi
+
+# Strip binaries (if any):
+find $PKG | xargs file | grep -e "executable" -e "shared object" | grep ELF \
+  | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null || true
+
+# Add a package description:
+mkdir -p $PKG/install
+cat $SRCDIR/slack-desc > $PKG/install/slack-desc
+
+# Build the package:
+cd $PKG
+makepkg --linkadd y --chown n $OUTPUT/${PRGNAM}-${VERSION}-${ARCH}-${BUILD}${TAG}.${PKGTYPE:-txz} 2>&1 | tee $OUTPUT/makepkg-${PRGNAM}.log
+cd $OUTPUT
+md5sum ${PRGNAM}-${VERSION}-${ARCH}-${BUILD}${TAG}.${PKGTYPE:-txz} > ${PRGNAM}-${VERSION}-${ARCH}-${BUILD}${TAG}.${PKGTYPE:-txz}.md5
+cd -
+cat $PKG/install/slack-desc | grep "^${PRGNAM}" > $OUTPUT/${PRGNAM}-${VERSION}-${ARCH}-${BUILD}${TAG}.txt
+
+# Restore the original umask:
+umask ${_UMASK_}
+