# Build HTML docs from markdown using pandoc?

%bcond_without html_docs

Name:           gn

# Upstream uses the number of commits in the git history as the version number.

# See gn --version, which outputs something like “1874 (2b683eff)”. The commit

# position and short commit hash in this string come from “git describe HEAD

# --match initial-commit”; see build/gen.py. This means that a complete git

# checkout is required to establish the version number; the information is not

# in the tarball! This is terribly inconvenient. See

# https://bugs.chromium.org/p/gn/issues/detail?id=3.

#

# As a result, it is necessary to use our custom update-version script,

# supplying the new full commit hash as the sole argument or providing no

# arguments to select the latest commit. This will:

#  1. Clone the git repository from the Internet (a substantial download)

#  2. Run build/gen.py to generate last_commit_position.h, the header with

#     version information, and copy it into the same directory as the script

#  3. Modify the commit and access macros and the Version field in this spec

#     file.

#  4. Download the source tarball (spectool -g)

#  5. Update the sources (fedpkg new-sources %%{commit}.tar.gz)

#  6. Stage all changes in git

#

# See https://gn.googlesource.com/gn/+log for the latest changes.

%global commit 4d207c94eab41f09c9a8505eb47f3d2919e47943

%global access 20210627

%global shortcommit %(echo %{commit} | cut -b -8)

Version:        1921

Release:        %autorelease -s %{access}git%{shortcommit}

Summary:        Meta-build system that generates build files for Ninja

# BSD except for src/base/third_party/icu/, which is (Unicode and MIT); note

# that the “ICU License” is MIT,

# https://fedoraproject.org/wiki/Licensing:MIT#Modern_style_.28ICU_Variant.29

#

# Note that src/util/test/gn_test.cc, which is licensed ASL 2.0, does not

# contribute to the installed RPM, only to the gn_unittests executable; you may

# verify this with:

#   gdb -ex 'set pagination off' -ex 'info sources' gn | grep -F gn_test.cc

License:        BSD and Unicode and MIT

URL:            https://%{name}.googlesource.com/%{name}

Source0:        %{url}/+archive/%{commit}.tar.gz#/%{name}-%{shortcommit}.tar.gz

# Generated using script update-version:

Source1:        last_commit_position.h

Source2:        update-version

# Clean up compiler warnings on gcc/g++. This patch is a rebased version of

# chromium-84.0.4147.105-gn-gcc-cleanup.patch from the chromium RPM; see:

#

#   https://src.fedoraproject.org/rpms/chromium/raw/

#     ce30313f5e4af121140c037bf026453355534f24/f/

#     chromium-84.0.4147.105-gn-gcc-cleanup.patch

Patch0:         %{name}-39a87c0b-gcc-cleanup.patch

# Stop overriding optimization flags

Patch1:         %{name}-0153d369-no-O3.patch

# The python3_pkgversion macro is required for EPEL; see

# https://fedoraproject.org/wiki/PackagingDrafts:Python3EPEL. On Fedora (and

# EPEL8) it simply expands to “3”.

BuildRequires:  python%{python3_pkgversion}

BuildRequires:  python%{python3_pkgversion}-devel

BuildRequires:  ninja-build

BuildRequires:  gcc-c++

BuildRequires:  /usr/bin/pathfix.py

%if %{with html_docs}

BuildRequires:  pandoc

BuildRequires:  parallel

%endif

BuildRequires:  help2man

Requires:       vim-filesystem

Requires:       python%{python3_pkgversion}

Provides:       vim-%{name} = %{version}-%{release}

BuildRequires:  emacs

Requires:       emacs-filesystem >= %{_emacs_version}

Provides:       emacs-%{name} = %{version}-%{release}

%description

GN is a meta-build system that generates build files for Ninja.

%package doc

Summary:        Documentation for GN

BuildArch:      noarch

%description doc

The %{name}-doc package contains detailed documentation for GN.

%prep

%autosetup -c -n %{name}-%{commit} -p1

# Use pre-generated last_commit_position.h.

mkdir -p ./out

cp -vp '%{SOURCE1}' ./out

# Copy and rename vim extensions readme for use in the main documentation

# directory.

cp -vp misc/vim/README.md README-vim.md

# Fix shebangs in examples and such.

%py3_shebang_fix .

# Stop overriding optimization flags

sed -r -i '/.append(.-O3.)/d' build/gen.py

%build

# We need to set CC and CXX explicitly before Fedora 33, including on the EPELs.

CC='gcc'; export CC

CXX='g++'; export CXX

AR='gcc-ar'; export AR

%set_build_flags

# Both --use-icf and --use-lto add compiler flags that only work with clang++,

# not with g++. We do get LTO on Fedora anyway, since we respect the

# distribution’s build flags.

%{__python3} build/gen.py \

    --no-last-commit-position \

    --no-strip \

    --no-static-libstdc++

ninja -C out -v

%if %{with html_docs}

# There is a script, misc/help_as_html.py, that generates some HTML help, but

# pandoc does a better job and we can cover more Markdown sources.

find . -type f -name '*.md' | parallel -v pandoc -o '{.}.html' '{}'

%endif

help2man \

    --name='%{summary}' \

    --version-string="%{name} $(./out/%{name} --version)" \

    --no-info \

    ./out/%{name} |

  # Clean up a couple of stray binary bytes in the help output

  tr -d '\302\240' |

  # Format the entries within the sections as tagged paragraphs, and italicise

  # [placeholders in square brackets].

  sed -r -e 's/(^[[:alnum:]_]+:)/.TP\n.B \1\n/' \

      -e 's/\[([^]]+)\]/\\fI[\1]\\fR/g' > out/%{name}.1

%install

install -d '%{buildroot}%{_bindir}'

install -t '%{buildroot}%{_bindir}' -p out/%{name}

install -d '%{buildroot}%{_datadir}/vim/vimfiles'

cp -vrp misc/vim/* '%{buildroot}%{_datadir}/vim/vimfiles'

find '%{buildroot}%{_datadir}/vim/vimfiles' \

    -type f -name 'README.*' -print -delete

%py_byte_compile %{__python3} '%{buildroot}%{_datadir}/vim/vimfiles/%{name}-format.py'

install -d '%{buildroot}%{_emacs_sitestartdir}'

install -t '%{buildroot}%{_emacs_sitestartdir}' -p -m 0644 misc/emacs/*.el

install -d '%{buildroot}%{_mandir}/man1'

install -t '%{buildroot}%{_mandir}/man1' -m 0644 -p out/%{name}.1

%check

out/gn_unittests

# Verify consistency of the version header with the spec file

grep -E '^#define[[:blank:]]+LAST_COMMIT_POSITION_NUM[[:blank:]]+'\

'%{version}[[:blank:]]*' \

    'out/last_commit_position.h' >/dev/null

grep -E '^#define[[:blank:]]+LAST_COMMIT_POSITION[[:blank:]]+'\

'"%{version} \(%{shortcommit}\)"[[:blank:]]*' \

    'out/last_commit_position.h' >/dev/null

%files

%license LICENSE

%{_bindir}/%{name}

%{_mandir}/man1/%{name}.1*

%{_datadir}/vim/vimfiles/%{name}-format.py

%{_datadir}/vim/vimfiles/autoload/%{name}.vim

%{_datadir}/vim/vimfiles/ftdetect/%{name}filetype.vim

%{_datadir}/vim/vimfiles/ftplugin/%{name}.vim

%{_datadir}/vim/vimfiles/syntax/%{name}.vim

%{_emacs_sitestartdir}/%{name}-mode.el

%files doc

%license LICENSE

%doc AUTHORS

%doc OWNERS

%doc README*.md

%if %{with html_docs}

%doc README*.html

%endif

%doc docs

%doc examples

%doc infra

%doc tools

%changelog

%autochangelog