#!/bin/bash

#ref: https://doc.qt.io/qt-6/build-sources.html
# Building from a tarball like
# https://download.qt.io/official_releases/qt/6.6/6.6.2/single/qt-everywhere-6.6.2.tar.xz
# appears to only contain some of the qt libraries, but not all that we
# need.  So we are trying to build Qt and all it's needed libraries from
# a git repo.  It may be that qt-everywhere-6.6.2.tar.xz contains all of
# the source we need, but it's currently broken (we failed to build with
# it).
#
# Looks like downloading Qt6 sources from the git server is faster than
# downloading it the tarball from https://download.qt.io/ even when
# including the running of init-repository which downloads most of the
# code.

# Looks like we have a git tag and a git branch that that tag is in:
tag=v6.7.0
swtag=6.7

#tag=v6.6.2


gitSrcDir=qt6-$tag-git_source

set -exo pipefail

cd "$(dirname ${BASH_SOURCE[0]})"

function FAIL() {
    set +x
    echo "Checking out Qt source $tag code FAILED"
    exit 1
}


if [ ! -d $gitSrcDir ] ; then
    git clone git://code.qt.io/qt/qt5.git $gitSrcDir || FAIL
    $(cd $gitSrcDir && ./init-repository) || FAIL
    # This command I do not understand:
    $(cd $gitSrcDir && git switch $swtag) || FAIL
    $(cd $gitSrcDir && git checkout $tag) || FAIL
fi

# At this point the directory $gitSrcDir exists


try=0
builddir=qt6_build-try$try
while [ -d $builddir ] ; do
    let try=$try+1
    builddir=qt6_build-try$try
done

# We'll assume that building in $buildDir does not change files in $gitSrcDir

mkdir "$builddir"
cd "$builddir"

prefix=/usr/local/encap/qt6-$tag

#../$gitSrcDir/configure --prefix=$prefix -debug -static # fails
../$gitSrcDir/configure --prefix=$prefix -debug
cmake --build . --parallel 9
cmake --install .

cd -

set +x

cat << EOF

   SUCCESSFULLY installed $prefix

EOF