#!/bin/bash

# Runs doxygen and massages the output files.
# Copyright (C) 2001-2021 Free Software Foundation, Inc.
#
# Synopsis:  run_doxygen --mode=[html|latex|man|xml] --host_alias=<alias> \
#                        v3srcdir \
#                        v3builddir \
#                        shortname
#
# Originally hacked together by Phil Edwards <pme@gcc.gnu.org>


# We can check now that the version of doxygen is >= this variable.
DOXYVER=1.7.0

find_doxygen() {
    local -r v_required=`echo $DOXYVER |  \
		awk -F. '{if(NF<3)$3=0;print ($1*100+$2)*100+$3}'`
    local testing_version doxygen maybedoxy v_found
    # thank you goat book
    set `IFS=:; X="$PATH:/usr/local/bin:/bin:/usr/bin"; echo $X`
    for dir
    do
      # AC_EXEEXT could come in useful here
      maybedoxy="$dir/doxygen"
      test -f "$maybedoxy" && testing_version=`$maybedoxy --version`
      if test -n "$testing_version"; then
       v_found=`echo $testing_version |  \
		awk -F. '{if(NF<3)$3=0;print ($1*100+$2)*100+$3}'`
       if test $v_found -ge $v_required; then
	 doxygen="$maybedoxy"
	 break
       fi
      fi
    done
    if test -z "$doxygen"; then
	fail "Could not find Doxygen $DOXYVER in path."
    fi
    # We need to use other tools from the same package/version.
    echo :: Using Doxygen tools from ${dir}.
    PATH=$dir:$PATH
    hash -r
}

print_usage() {
    cat <<EOF
Usage:  run_doxygen --mode=MODE --host_alias=HOST_ALIAS [<options>]
		    <v3-src-dir> <v3-build-dir> <shortnamesp>
      MODE is one of:
	  html           Generate user-level HTML library documentation.
	  man            Generate user-level man pages.
	  xml            Generate user-level XML pages.
	  latex          Generate user-level LaTeX pages.

      HOST_ALIAS is the GCC host alias triplet set at configure time.

      shortnamesp is one of YES or NO and is used as the SHORT_NAMES value
      in the Doxygen config file.

      Supported options:

      --help | -h      Print this message and exit.
      --latex_cmd=CMD  Set LATEX_CMD_NAME=CMD in the Doxygen config file.

Note:  Requires Doxygen ${DOXYVER} or later; get it at
       ftp://ftp.stack.nl/pub/users/dimitri/doxygen-${DOXYVER}.src.tar.gz

EOF
}

# Print an error message followed by usage to stderr, then exit.
fail() {
  echo "$0: error: $*" 1>&2
  echo 1>&2
  print_usage 1>&2
  exit 1
}

parse_options() {
  while [ $# -ne 0 ]
  do
    # Blatantly ripped from autoconf, er, I mean, "gratefully standing
    # on the shoulders of those giants who have gone before us."
    case "$1" in
      -*=*) arg=`echo "$1" | sed 's/[-_a-zA-Z0-9]*=//'` ;;
      *) arg= ;;
    esac

    case "$1" in
      --mode=*)
	mode=$arg ;;
      --host_alias=*)
	host_alias=$arg ;;
      --help | -h)
	print_usage ; exit ;;
      --mode | --host_alias)
	fail "missing argument: $1" ;;
      --latex_cmd=*)
	latex_cmd=$arg ;;
      --*)
	fail "invalid option: $1" ;;
      *)
	break ;;
    esac
    shift
  done

  if [ $# -ne 3 ]
  then
    fail "wrong number of arguments"
  fi
  srcdir="$1"
  builddir="$2"
  outdir="$2/doc/doxygen"
  shortname="$3"
}


# script begins here
mode=unset
host_alias=unset
srcdir=unset
outdir=unset
shortname=unset
do_html=false
do_man=false
do_xml=false
do_latex=false
latex_cmd=
enabled_sections=
generate_tagfile=
DATEtext=`date '+%Y-%m-%d'`

# Show how this script is called.
echo run_doxygen $*

parse_options $*
find_doxygen

if test $srcdir = unset || test $outdir = unset || test $mode = unset || test $shortname = unset || test $host_alias = unset; then
    # this could be better
    fail "You have not given enough information...!  $srcdir - "
fi

case x"$mode" in
    xhtml)
      do_html=true
      enabled_sections=maint
      generate_tagfile="$outdir/html/libstdc++.tag"
      ;;
    xlatex)
      do_latex=true
      enabled_sections=maint
      ;;
    xman)
      do_man=true
      ;;
    xxml)
      do_xml=true
      enabled_sections=maint
      ;;
    *)
      echo run_doxygen error:  $mode is an invalid mode 1>&2
      exit 1 ;;
esac

case x"$shortname" in
    xYES)
      ;;
    xNO)
      ;;
    *)
      echo run_doxygen error:  $shortname is invalid 1>&2
      exit 1 ;;
esac


mkdir -p $outdir
chmod u+w $outdir

# Run it
(
    set -e
    cd $builddir
    sed -e "s=@outdir@=${outdir}=g" \
	-e "s=@srcdir@=${srcdir}=g" \
	-e "s=@shortname@=${shortname}=g" \
	-e "s=@builddir@=${builddir}=g" \
	-e "s=@host_alias@=${host_alias}=g" \
	-e "s=@enabled_sections@=${enabled_sections}=" \
	-e "s=@do_html@=${do_html}=" \
	-e "s=@do_latex@=${do_latex}=" \
	-e "s=@latex_cmd@=${latex_cmd}=" \
	-e "s=@do_man@=${do_man}=" \
	-e "s=@do_xml@=${do_xml}=" \
	-e "s=@generate_tagfile@=${generate_tagfile}=" \
	${srcdir}/doc/doxygen/user.cfg.in > ${outdir}/${mode}.cfg
    echo :: NOTE that this may take some time...
    echo doxygen ${outdir}/${mode}.cfg
    doxygen ${outdir}/${mode}.cfg
)
ret=$?
test $ret -ne 0 && exit $ret

if $do_xml; then
    echo ::
    echo :: XML pages begin with
    echo :: ${outdir}/xml/index.xml
fi

if $do_latex; then
    cd ${outdir}/${mode}

    # Grrr, Doxygen 1.8.x changed the -w latex options.
    need_footer=`doxygen -h | sed -n -e '/-w latex/s=.*footer.*=true=p'`

    # Also drop in the header file (maybe footer file) and style sheet
    if $need_footer; then
      doxygen -w latex header.tex footer.tex doxygen.sty
    else
      doxygen -w latex header.tex doxygen.sty
    fi
    
    echo ::
    echo :: LaTeX pages begin with
    echo :: ${outdir}/latex/refman.tex
fi
    
if $do_html; then
  cd ${outdir}/${mode}

  #doxytag -t libstdc++.tag . > /dev/null 2>&1

  # Strip pathnames from tag file.
  sed -e '/<path>/d' libstdc++.tag > TEMP
  mv TEMP libstdc++.tag

  sed -e "s=@DATE@=${DATEtext}=" \
      ${srcdir}/doc/doxygen/mainpage.html > index.html

  # The following bit of line noise changes annoying
  #   std::foo < typename _Ugly1, typename _Ugly2, .... _DefaultUgly17 >
  # to user-friendly
  #   std::foo
  # in the major "Compound List" page.
  sed -e 's=\(::[[:alnum:]_]*\)&lt; .* &gt;=\1=' annotated.html > annstrip.html
  mv annstrip.html annotated.html

  cp ${srcdir}/doc/doxygen/tables.html tables.html

  echo ::
  echo :: HTML pages begin with
  echo :: ${outdir}/html/index.html
fi

# Mess with the man pages.  We don't need documentation of the internal
# headers, since the man pages for those contain nothing useful anyhow.  The
# man pages for doxygen modules need to be renamed (or deleted).  And the
# generated #include lines need to be changed from the internal names to the
# standard ones (e.g., "#include <stl_tempbuf.h>" -> "#include <memory>").
if $do_man; then
echo ::
echo :: Fixing up the man pages...
cd $outdir/man/man3

# File names with embedded spaces (EVIL!) need to be....?  renamed or removed?
find . -name "* *" -print0 | xargs -0r rm        # requires GNU tools

# man pages are for functions/types/other entities, not source files
# directly.  who the heck would type "man foo.h" anyhow?
# FIXME: This also removes std.3 which is the only place that a lot of
# functions are documented. Should we keep it?
find . -name "[a-z]*" -a ! -name "std_*" -print | xargs rm
rm -f *.h.3 *.hpp.3 *config* *.cc.3 *.tcc.3 *_t.3
#rm ext_*.3 tr1_*.3 debug_*.3

# this is used to examine what we would have deleted, for debugging
#mkdir trash
#find . -name "[a-z]*" -a ! -name "std_*" -print | xargs -i mv {} trash
#mv *.h.3 *config* *.cc.3 *.tcc.3 *_t.3  trash

gxx=$($builddir/scripts/testsuite_flags --build-cxx)
cppflags=$($builddir/scripts/testsuite_flags --build-includes)
cxxflags="-Og -g -std=gnu++23"

# Standardize the displayed header names.  If anyone who knows perl cares
# enough to rewrite all this, feel free.  This only gets run once a century,
# and I'm off getting coffee then anyhow, so I didn't care enough to make
# this super-fast.
$gxx $cppflags $cxxflags ${srcdir}/doc/doxygen/stdheader.cc -o ./stdheader || exit 1
# Doxygen outputs something like "\fC#include <unique_lock\&.h>\fP" and
# we want that internal header to be replaced with something like <mutex>.
problematic=`egrep -l '#include <.*h>' [a-z]*.3`
for f in $problematic; do
    # this is also slow, but safe and easy to debug
    oldh=`sed -n '/fC#include </s/.*<\(.*\)>.*/\1/p' $f`
    newh=`echo $oldh | sed 's/\\\\&\\././g' | ./stdheader`
    sed "s=${oldh/\\/.}=${newh}=" $f > TEMP && mv TEMP $f
done
rm stdheader

# Some of the pages for generated modules have text that confuses certain
# implementations of man(1), e.g. on GNU/Linux.  We need to have another
# top-level *roff tag to /stop/ the .SH NAME entry.
problematic=`egrep --files-without-match '^\.SH SYNOPSIS' [A-Z]*.3`
#problematic='Containers.3 Sequences.3 Assoc_containers.3 Iterator_types.3'

for f in $problematic; do
    sed '/^\.SH NAME/{
n
a\
\
.SH SYNOPSIS
    }' $f > TEMP
    mv TEMP $f
done

# Also, break this (generated) line up.  It's ugly as sin.
problematic=`grep -l '[^^]Definition at line' *.3`
for f in $problematic; do
    sed 's/Definition at line/\
.PP\
&/'  $f > TEMP
    mv TEMP $f
done

cp ${srcdir}/doc/doxygen/Intro.3 C++Intro.3

# Why didn't I do this at the start?  Were rabid weasels eating my brain?
# Who the fsck would "man std_vector" when the class isn't named that?

# If no files match a glob, skip the for-loop:
shopt -s nullglob
# First, deal with nested namespaces.
for ns in chrono filesystem ranges views literals; do
  for f in std_${ns}_*; do
      newname=`echo $f | sed "s/std_${ns}_/std::${ns}::/"`
      mv $f $newname
  done
done
for f in *__debug_*; do
    newname=`echo $f | sed 's/__debug_/__debug::/'`
    mv $f $newname
done
for f in *decimal_*; do
    newname=`echo $f | sed 's/decimal_/decimal::/'`
    mv $f $newname
done
for f in *__detail_*; do
    newname=`echo $f | sed 's/__detail_/__detail::/'`
    mv $f $newname
done
for f in *__gnu_pbds_detail_*; do
    newname=`echo $f | sed 's/detail_/detail::/'`
    mv $f $newname
done
for f in *__parallel_*; do
    newname=`echo $f | sed 's/__parallel_/__parallel::/'`
    mv $f $newname
done

# Remove inline namespaces used for versioning.
for f in *_V2_*; do
    newname=`echo $f | sed 's/_V2_/::/'`
    sed 's/::_V2::/::/g' $f > $newname
    rm $f
done
for f in *_experimental_filesystem_v?_*; do
    newname=`echo $f | sed 's/_filesystem_v._/::filesystem::/'`
    sed 's/::filesystem::v.::/::filesystem::/g' $f > $newname
    rm $f
done
for f in *experimental_fundamentals_v?_*; do
    newname=`echo $f | sed 's/experimental_.*_v[[:digit:]]_/experimental::/'`
    sed 's/::experimental::fundamentals_v[[:digit:]]::/::experimental::/g' $f > $newname
    rm $f
done

# Then, clean up other top-level namespaces.
for f in std_tr1_*; do
    newname=`echo $f | sed 's/^std_tr1_/std::tr1::/'`
    mv $f $newname
done
for f in std_tr2_*; do
    newname=`echo $f | sed 's/^std_tr2_/std::tr2::/'`
    mv $f $newname
done
for f in std_*; do
    newname=`echo $f | sed 's/^std_/std::/'`
    mv $f $newname
done
for f in __gnu_cxx_*; do
    newname=`echo $f | sed 's/^__gnu_cxx_/__gnu_cxx::/'`
    mv $f $newname
done
for f in __gnu_debug_*; do
    newname=`echo $f | sed 's/^__gnu_debug_/__gnu_debug::/'`
    mv $f $newname
done
for f in __gnu_parallel_*; do
    newname=`echo $f | sed 's/^__gnu_parallel_/__gnu_parallel::/'`
    mv $f $newname
done
for f in __gnu_pbds_*; do
    newname=`echo $f | sed 's/^__gnu_pbds_/__gnu_pbds::/'`
    mv $f $newname
done
for f in __cxxabiv1_*; do
    newname=`echo $f | sed 's/^__cxxabiv1_/abi::/'`
    mv $f $newname
done

# Then piecemeal nested classes


# Generic removal bits, where there are things in the generated man
# pages that need to be killed.
for f in *_libstdc__-v3_*; do
    rm $f
done

for f in *_src_*; do
    rm $f
done

# Remove all internal implementation details?
# rm std::_[A-Z]*.3 std::__detail*.3

shopt -u nullglob


# Also, for some reason, typedefs don't get their own man pages.  Sigh.
for f in ios streambuf istream ostream iostream stringbuf \
	 istringstream ostringstream stringstream filebuf ifstream \
	 ofstream fstream string
do
    echo ".so man3/std::basic_${f}.3" > std::${f}.3
    echo ".so man3/std::basic_${f}.3" > std::w${f}.3
done

echo ::
echo :: Man pages in ${outdir}/man
fi

# all done
echo ::

exit 0