#!/bin/sh

# Generate HTML documentation from GCC Texinfo docs.
#
# If you want to run this on a machine different from gcc.gnu.org, you
# may need to adjust GITROOT and WWWBASE below (or override them via the
# environment).

set -e

# Run this from /tmp.
GITROOT=${GITROOT:-"/git/gcc.git"}
export GITROOT

PATH=/usr/local/bin:$PATH

MANUALS="cpp
  cppinternals
  fastjar
  gcc
  gccgo
  gccint
  gcj
  gfortran
  gfc-internals
  gnat_ugn
  gnat-style
  gnat_rm
  libgomp
  libitm
  libquadmath
  libiberty
  porting"

CSS=/gcc.css

WWWBASE=${WWWBASE:-"/www/gcc/htdocs"}
WWWBASE_PREFORMATTED=/www/gcc/htdocs-preformatted
WWWPREPROCESS='/www/gcc/bin/preprocess -r'

# Process options -rrelease and -ddirectory
RELEASE=""
SUBDIR=""

while [ $# -gt 0 ]; do
  case $1 in
    -r*)
      if [ -n "$RELEASE" ]; then
        echo "Multiple releases specified" >&2
	exit 1
      fi
      RELEASE="${1#-r}"
      if [ -z "$RELEASE" ]; then
	shift
	RELEASE="$1"
	if [ -z "$RELEASE" ]; then
	  echo "No release specified with -r" >&2
	  exit 1
	fi
      fi
      ;;
    -d*)
      if [ -n "$SUBDIR" ]; then
        echo "Multiple subdirectories specified" >&2
	exit 1
      fi
      SUBDIR="${1#-d}"
      if [ -z "$SUBDIR" ]; then
	shift
	SUBDIR="$1"
	if [ -z "$SUBDIR" ]; then
	  echo "No subdirectory specified with -d" >&2
	  exit 1
	fi
      fi
      ;;
    *)
      echo "Unknown argument \"$1\"" >&2
      exit 1
      ;;
  esac
  shift
done

if [ -n "$RELEASE" ] && [ -z "$SUBDIR" ]; then
  echo "Release specified without subdirectory" >&2
  exit 1
fi

if [ -z "$SUBDIR" ]; then
  DOCSDIR=$WWWBASE/onlinedocs
else
  DOCSDIR=$WWWBASE/onlinedocs/$SUBDIR
fi

if [ ! -d $WWWBASE ]; then
  echo "WWW base directory \"$WWWBASE\" does not exist." >&2
  exit 1
fi

if [ ! -d $DOCSDIR ]; then
  mkdir $DOCSDIR
  chmod g+w $DOCSDIR
fi

if [ -z "$RELEASE" ]; then
  RELEASE=master
fi

WORKDIR=/tmp/gcc-doc-update.$$

rm -rf $WORKDIR
mkdir $WORKDIR
cd $WORKDIR
if [ "$RELEASE" = "master" ]; then
  git clone -q $GITROOT gcc
else
  git clone -q -b releases/gcc-$RELEASE $GITROOT gcc
fi
rm -rf gcc/.git

# Remove all unwanted files.  This is needed to avoid packaging all the
# sources instead of only documentation sources.
# Note that we have to preserve gcc/jit/docs since the jit docs are
# not .texi files (Makefile, .rst and .png), and the jit docs use
# include directives to pull in content from jit/jit-common.h and
# jit/notes.txt, so we have to preserve those also.
find gcc -type f \( -name '*.texi' \
  -o -path gcc/gcc/doc/install.texi2html \
  -o -path gcc/gcc/doc/include/texinfo.tex \
  -o -path gcc/gcc/BASE-VER \
  -o -path gcc/gcc/DEV-PHASE \
  -o -path "gcc/gcc/ada/doc/gnat_ugn/*.png" \
  -o -path "gcc/gcc/jit/docs/*" \
  -o -path "gcc/gcc/jit/jit-common.h" \
  -o -path "gcc/gcc/jit/notes.txt" \
  -o -print0 \) | xargs -0 rm -f

# Build a tarball of the sources.
tar cf docs-sources.tar gcc

# The directory to pass to -I; this is the one with texinfo.tex
# and fdl.texi.
includedir=gcc/gcc/doc/include

# Generate gcc-vers.texi.
(
   echo "@set version-GCC $(cat gcc/gcc/BASE-VER)"
   if [ "$(cat gcc/gcc/DEV-PHASE)" = "experimental" ]; then
      echo "@set DEVELOPMENT"
   else
      echo "@clear DEVELOPMENT"
   fi
   echo "@set srcdir $WORKDIR/gcc/gcc"
   echo "@set VERSION_PACKAGE (GCC)"
   echo "@set BUGURL @uref{http://gcc.gnu.org/bugs/}"
) > $includedir/gcc-vers.texi

# Generate libquadmath-vers.texi.
echo "@set BUGURL @uref{http://gcc.gnu.org/bugs/}" \
  > $includedir/libquadmath-vers.texi

# Now convert the relevant files from texi to HTML, PDF and PostScript.
for file in $MANUALS; do
  filename=`find . -name ${file}.texi`
  if [ "${filename}" ]; then
    includes="-I ${includedir} -I `dirname ${filename}`"
    if [ "$file" = "gnat_ugn" ]; then
      includes="$includes -I gcc/gcc/ada -I gcc/gcc/ada/doc/gnat_ugn"
    fi
    makeinfo --html --css-ref $CSS $includes -o ${file} ${filename}
    tar cf ${file}-html.tar ${file}/*.html
    texi2dvi $includes -o ${file}.dvi ${filename} </dev/null >/dev/null && dvips -o ${file}.ps ${file}.dvi
    texi2pdf $includes -o ${file}.pdf ${filename} </dev/null
    mkdir -p $DOCSDIR/$file
  fi
done

# The jit is a special-case, using sphinx rather than texinfo.
# Specifically, the jit docs need sphinx 1.0 or later.
#
# The jit/docs Makefile uses the executable $(SPHINXBUILD),
# defaulting to "sphinx-build".
#
# sphinx is packaged in Fedora and EPEL 6 within "python-sphinx",
# in RHEL 8 within "python3-sphinx",
# and in openSUSE within "python-Sphinx".
#
# For EPEL6, python-sphinx is sphinx 0.6.6, which is missing various
# directives (e.g. ":c:macro:"), so we need the variant
# python-sphinx10 package.  The latter installs its executable as
#   /usr/bin/sphinx-1.0-build
# so we needed to override SPHINXBUILD with this when invoking "make".
pushd gcc/gcc/jit/docs
make html || true
popd
cp -a gcc/gcc/jit/docs/_build/html jit
mkdir -p $DOCSDIR/jit

# Work around makeinfo generated file names and references with
# "_002d" instead of "-".
find . -name '*.html' | while read f; do
  # Do this for the contents of each file.
  sed -i -e 's/_002d/-/g' "$f"
  # And rename files if necessary.
  ff=`echo $f | sed -e 's/_002d/-/g'`;
  if [ "$f" != "$ff" ]; then
    printf "Renaming %s to %s\n" "$f" "$ff" 
    mv "$f" "$ff"
  fi
done

# Then build a gzipped copy of each of the resulting .html, .ps and .tar files
for file in */*.html *.ps *.pdf *.tar; do
  cat $file | gzip --best > $file.gz
done

# On the 15th of the month, wipe all the old files from the
# web server.
today=`date +%d`
if test $today = 15; then
  find $DOCSDIR -type f -maxdepth 1 -print | grep -v index.html | xargs rm
  for m in $MANUALS; do
    rm -f $DOCSDIR/$m/*.html $DOCSDIR/$m/*.html.gz
  done
fi

# And copy the resulting files to the web server
for file in */*.html *.ps *.pdf *.tar; do
  if [ -f $DOCSDIR/$file ]; then
    cat $DOCSDIR/$file | 
      sed -e '/^<meta name=generator/d' \
          -e '/^%DVIPSSource:/d' > file1
  fi
  cat $file |
    sed -e '/^<meta name=generator/d' \
        -e '/^%DVIPSSource:/d' > file2
  if cmp -s file1 file2; then
    :
  else
    cp $file $DOCSDIR/$file
    cp $file.gz $DOCSDIR/$file.gz
  fi
done

# Again, the jit is a special case, with nested subdirectories
# below "jit", and with some non-HTML files (.png images from us,
# plus .css and .js supplied by sphinx, and source files, renamed
# from .rst to .txt).
find jit \
    -name "*.html" -o -name "*.png" \
    -o -name "*.css" -o -name "*.js" \
    -o -name "*.txt" |
  while read file ; do
    # Note that $file here will contain path fragments beginning
    # with "jit/", e.g. "jit/cp/topics/functions.html"
    mkdir -p $(dirname $DOCSDIR/$file)
    cp $file $DOCSDIR/$file
  done

cd $DOCSDIR

# Finally, generate the installation documentation
if [ "$RELEASE" = "master" ]; then
  SOURCEDIR=$WORKDIR/gcc/gcc/doc
  DESTDIR=$WWWBASE_PREFORMATTED/install
  export SOURCEDIR
  export DESTDIR
  $WORKDIR/gcc/gcc/doc/install.texi2html

  # Preprocess the entire web site, not just the install docs!
  echo "Invoking $WWWPREPROCESS"
  $WWWPREPROCESS |grep -v '^  Warning: Keeping'
fi

# Clean up behind us.

rm -rf $WORKDIR