File macros.openstack-singlespec of Package openstack-macros

%prepare_alternative(t:) \
%define alternative_target %{-t:%{-t*}}%{!-t:%{_bindir}/%1} \
rm -f %{buildroot}%{alternative_target} \
alternative_target="%{alternative_target}" \
if [[ "$alternative_target" == %{_mandir}* ]]; then \
    rm -f %{buildroot}${alternative_target%%%%%{ext_man}} \
    rm -f %{buildroot}%{alternative_target}%{ext_man} \
fi \
mkdir -p %{buildroot}%{_sysconfdir}/alternatives \
touch %{buildroot}%{_sysconfdir}/alternatives/%1 \
ln -sf %{_sysconfdir}/alternatives/%1 %{buildroot}%{alternative_target} \
%{nil}

%install_alternative(s:t:p:n:) \
%define alternative_name %{-n:%{-n*}}%{!-n:%1} \
%define alternative_source %{-s:%{-s*}}%{!-s:%{_bindir}/%{alternative_name}} \
%define alternative_target %{-t:%{-t*}}%{!-t:%2} \
%define alternative_priority %{-p:%{-p*}}%{!-p:%3} \
update-alternatives --install \\\
    %{alternative_source} \\\
    %{alternative_name} \\\
    %{alternative_target} \\\
    %{alternative_priority}

%uninstall_alternative(n:t:) \
%define alternative_name %{-n:%{-n*}}%{!-n:%1} \
%define alternative_target %{-t:%{-t*}}%{!-t:%2} \
if [ ! -e "%{alternative_target}" ]; then \
    update-alternatives --quiet --remove "%{alternative_name}" "%{alternative_target}" \
fi \
%{nil}

%alternative_for() \
%1 \
%ghost %{_sysconfdir}/alternatives/%{basename:%1}

%system_python python2
%python_for_executables python3

##### common functionality #####

%_python_sysconfig_path() %(%1 -c "import sysconfig as s; print(s.get_paths().get('%2'))")
%_python_sysconfig_var()  %(%1 -c "import sysconfig as s; print(s.get_config_var('%2'))")

%_rec_macro_helper %{lua:
    rpm.define("_rec_macro_helper %{nil}")
    function expand_macro(name, args)
        local interp = rpm.expand("%python_flavor")
        local args   = args and rpm.expand(args) or ""
        print(rpm.expand("%{" .. interp .. "_" .. name .. " " .. args .."}"))
    end
    function call_sysconfig(which, interp)
        local arg = rpm.expand("%1")
        print(rpm.expand("%{_python_sysconfig_" .. which .. " " .. interp .. " " .. arg .. "}"))
    end
}

##### fedora compatibility #####

%py_setup setup.py
%py_shbang_opts -s

##### binary suffixes for flavors #####

%python2_bin_suffix %python2_version
%python3_bin_suffix %python3_version
%pypy3_bin_suffix   pp%{pypy3_version}

##### preferred configuration #####

%python_sitelib          %{_python_sysconfig_path %python_flavor purelib}
%python_sitearch         %{_python_sysconfig_path %python_flavor platlib}
%python_version          %{_python_sysconfig_var  %python_flavor py_version_short}
%python_version_nodots   %{_python_sysconfig_var  %python_flavor py_version_nodot}

%python_prefix                  %{_rec_macro_helper}%{lua:expand_macro("prefix")}
%python_bin_suffix              %{_rec_macro_helper}%{lua:expand_macro("bin_suffix")}

%python_sysconfig_path()        %{_rec_macro_helper}%{lua:call_sysconfig("path", "%python_flavor")}
%python_sysconfig_var()         %{_rec_macro_helper}%{lua:call_sysconfig("var", "%python_flavor")}

%python_alternative()           %{_rec_macro_helper}%{lua:expand_macro("alternative", "%**")}
%python_install_alternative()   %{_rec_macro_helper}%{lua:expand_macro("install_alternative", "%**")}
%python_uninstall_alternative() %{_rec_macro_helper}%{lua:expand_macro("uninstall_alternative", "%**")}

%py_ver  %python_version

##### macro definitions for flavor "pypy3" #####

%__pypy3               /usr/bin/pypy3

%pypy3_shbang_opts     %py_shbang_opts

%pypy3_prefix          pypy3
%pypy3_sitelib         %{_python_sysconfig_path pypy3 purelib}
%pypy3_sitearch        %{_python_sysconfig_path pypy3 platlib}
%pypy3_version         %{_python_sysconfig_var pypy3 py_version_short}
%pypy3_version_nodots  %{_python_sysconfig_var pypy3 py_version_nodot}

%pypy3_sysconfig_path() %{_rec_macro_helper}%{lua:call_sysconfig("path", "pypy3")}
%pypy3_sysconfig_var()  %{_rec_macro_helper}%{lua:call_sysconfig("var", "pypy3")}

%ifpypy3      %if "%{python_flavor}" == "pypy3"

%pypy3_only() %if "%{python_flavor}" == "pypy3" \
%** \
%endif

%pypy3_build \
%{_python_use_flavor pypy3} \
%__pypy3 %{py_setup} %{?py_setup_args} build \\\
    --executable="%__pypy3 %pypy3_shbang_opts"

%pypy3_install \
%{_python_use_flavor pypy3} \
%__pypy3 %{py_setup} %{?py_setup_args} install \\\
    -O1 --skip-build --force --root %{buildroot} --prefix %{_prefix}

%pypy3_alternative() %{_python_macro_init} \
%{lua:local link, name, path = python_alternative_names(rpm.expand("%1"), rpm.expand("%pypy3_bin_suffix")) \
print(rpm.expand("%ghost %{_sysconfdir}/alternatives/" .. name .. "\\\n")) \
print(link .. "\\\n") \
print(path .. "\\\n") }

%pypy3_install_alternative() %{_python_macro_init} \
%{lua:python_install_alternative("pypy3")}

%pypy3_uninstall_alternative() \
%{uninstall_alternative -n %1 -t %{_bindir}/%1-%pypy3_bin_suffix}

##### macro definitions for flavor "python2" #####

%__python2               /usr/bin/python2

%python2_shbang_opts     %py_shbang_opts

%python2_prefix          python2
%python2_sitelib         %{_python_sysconfig_path python2 purelib}
%python2_sitearch        %{_python_sysconfig_path python2 platlib}
%python2_version         %{_python_sysconfig_var python2 py_version_short}
%python2_version_nodots  %{_python_sysconfig_var python2 py_version_nodot}

%python2_sysconfig_path() %{_rec_macro_helper}%{lua:call_sysconfig("path", "python2")}
%python2_sysconfig_var()  %{_rec_macro_helper}%{lua:call_sysconfig("var", "python2")}

%ifpython2      %if "%{python_flavor}" == "python2"

%python2_only() %if "%{python_flavor}" == "python2" \
%** \
%endif

%python2_build \
%{_python_use_flavor python2} \
%__python2 %{py_setup} %{?py_setup_args} build \\\
    --executable="%__python2 %python2_shbang_opts"

%python2_install \
%{_python_use_flavor python2} \
%__python2 %{py_setup} %{?py_setup_args} install \\\
    -O1 --skip-build --force --root %{buildroot} --prefix %{_prefix}

%python2_alternative() %{_python_macro_init} \
%{lua:local link, name, path = python_alternative_names(rpm.expand("%1"), rpm.expand("%python2_bin_suffix")) \
print(rpm.expand("%ghost %{_sysconfdir}/alternatives/" .. name .. "\\\n")) \
print(link .. "\\\n") \
print(path .. "\\\n") }

%python2_install_alternative() %{_python_macro_init} \
%{lua:python_install_alternative("python2")}

%python2_uninstall_alternative() \
%{uninstall_alternative -n %1 -t %{_bindir}/%1-%python2_bin_suffix}

##### macro definitions for flavor "python3" #####

%__python3               /usr/bin/python3

%python3_shbang_opts     %py_shbang_opts

%python3_prefix          python3
%python3_sitelib         %{_python_sysconfig_path python3 purelib}
%python3_sitearch        %{_python_sysconfig_path python3 platlib}
%python3_version         %{_python_sysconfig_var python3 py_version_short}
%python3_version_nodots  %{_python_sysconfig_var python3 py_version_nodot}

%python3_sysconfig_path() %{_rec_macro_helper}%{lua:call_sysconfig("path", "python3")}
%python3_sysconfig_var()  %{_rec_macro_helper}%{lua:call_sysconfig("var", "python3")}

%ifpython3      %if "%{python_flavor}" == "python3"

%python3_only() %if "%{python_flavor}" == "python3" \
%** \
%endif

%python3_build \
%{_python_use_flavor python3} \
%__python3 %{py_setup} %{?py_setup_args} build \\\
    --executable="%__python3 %python3_shbang_opts"

%python3_install \
%{_python_use_flavor python3} \
%__python3 %{py_setup} %{?py_setup_args} install \\\
    -O1 --skip-build --force --root %{buildroot} --prefix %{_prefix}

%python3_alternative() %{_python_macro_init} \
%{lua:local link, name, path = python_alternative_names(rpm.expand("%1"), rpm.expand("%python3_bin_suffix")) \
print(rpm.expand("%ghost %{_sysconfdir}/alternatives/" .. name .. "\\\n")) \
print(link .. "\\\n") \
print(path .. "\\\n") }

%python3_install_alternative() %{_python_macro_init} \
%{lua:python_install_alternative("python3")}

%python3_uninstall_alternative() \
%{uninstall_alternative -n %1 -t %{_bindir}/%1-%python3_bin_suffix}

##### compatibility short-name macros #####

# fedora expects %py_shbang_opts and %pyX_shbang_opts, possibly to be redefinable?
# we expect everything to start with binary name, so we actually use %pythonX_shbang_opts
# so if a specfile redefines the %pyX_, the correct one will be used
%py2_shbang_opts %py_shbang_opts
%python2_shbang_opts %py2_shbang_opts
%py3_shbang_opts %py_shbang_opts
%python3_shbang_opts %py3_shbang_opts

%py2_build   %python2_build
%py2_install %python2_install
%py3_build   %python3_build
%py3_install %python3_install

%py2_ver     %python2_version
%py3_ver     %python3_version

%python2_prefix   %{?python2_package_prefix}%{?!python2_package_prefix:python}

%pythons  %{?!skip_python2:python2} %{?!skip_python3:python3}

# This method for generating python_modules gets too deep to expand at about 5 python flavors.
# It is replaced by a Lua macro in macros.lua
# However, OBS has a much higher expansion depth, so this works fine.
%python_module_iter(a:) %{-a*}-%{args} %{expand:%%{?!python_module_iter_%1:%%{python_module_iter -a %*}}}
%python_module_iter_STOP stop
%python_module() %{expand:%%define args %{**}} %{expand:%%{python_module_iter -a %{pythons} STOP}}

%add_python() %{expand:%%define pythons %pythons %1}

%python_flavor %{_python_macro_init}%{lua: print(flavor)}

%if_python_kind()     %if "%{python_flavor}" == "%1"
%if_not_python_kind() %if "%{python_flavor}" != "%1"

%ifpycache %if "%{python_flavor}" != "python2"

%pycache_only() %ifpycache \
%** \
%endif

%_python_use_flavor() \
python_flavor=`[ -f _current_flavor ] && cat _current_flavor || true` \
if [ -z "$python_flavor" ]; then python_flavor="tmp"; fi \
if [ "$python_flavor" != "%1" ]; then \
    if [ -d build ]; then mv build _build.$python_flavor; fi \
    if [ -d _build.%1 ]; then mv _build.%1 build; fi \
fi \
echo %1 > _current_flavor \
%{nil}

%_python_stash_flavor() \
if [ -d build ]; then mv build _build.%1; fi \
if [ -d _build.tmp ]; then mv _build.tmp build; fi \
%{nil}


### LUA-MACROS ###
%_python_definitions %{lua:
-- declare common functions
function string.startswith(str, prefix)
    return str:sub(1, prefix:len()) == prefix
end
function string.endswith(str, suffix)
    return str:sub(-suffix:len()) == suffix
end
function string.basename(str)
    while true do
        local idx = str:find("/")
        if not idx then return str end
        str = str:sub(idx + 1)
    end
end
function lookup_table(tbl)
    local result = {}
    for _,v in ipairs(tbl) do result[v] = true end
    return result
end
-- macro replacements
SHORT_FLAVORS = {
    -- ??
    python = "py",
    -- ??
    python2 = "py2",
    python3 = "py3",
    pypy = "pypy",
}
function replace_macros(str, targetflavor)
    local LONG_MACROS = { "sitelib", "sitearch",
        "alternative", "install_alternative", "uninstall_alternative",
        "version", "version_nodots", "bin_suffix", "prefix"}
    local SHORT_MACROS = { "ver" }
    for _, srcflavor in ipairs({flavor, "python"}) do
        str = str:gsub("%%__" .. srcflavor, "%%__" .. targetflavor)
        for _, macro in ipairs(LONG_MACROS) do
            local from = string.format("%s_%s", srcflavor, macro)
            local to = string.format("%s_%s", targetflavor, macro)
            str = str:gsub("%%" .. from, "%%" .. to)
            str = str:gsub("%%{" .. from .. "}", "%%{" .. to .. "}")
            str = str:gsub("%%{" .. from .. "(%s+.-)}", "%%{" .. to .. "%1}")
        end
        for _, macro in ipairs(SHORT_MACROS) do
            local from = string.format("%s_%s", SHORT_FLAVORS[srcflavor], macro)
            local to = string.format("%s_%s", SHORT_FLAVORS[targetflavor], macro)
            str = str:gsub("%%" .. from, "%%" .. to)
            str = str:gsub("%%{" .. from .. "}", "%%{" .. to .. "}")
        end
    end
    return str
end
function package_name(flavor, modname, subpkg, append)
    if flavor == "python2" and old_python2 then
        flavor = "python"
    end
    local name = flavor .. "-" .. modname
    if subpkg and subpkg ~= "" then
        name = name .. "-" .. subpkg
    end
    if append and append ~= "" then
        name = name .. " " .. append
    end
    return name
end
function pkgname_from_param(param)
    if param == modname then
        return ""
    elseif param:startswith(modname .. "-") then
        return param:sub(modname:len() + 2)
    else
        return "-n " .. param
    end
end
-- alternative-related
local bindir = rpm.expand("%{_bindir}")
local mandir = rpm.expand("%{_mandir}")
local ext_man, ext_man_expr
ext_man = rpm.expand("%{ext_man}")
if ext_man == "" then
    ext_man_expr = "%.%d$"
else
    -- ASSUMPTION: ext_man:startswith(".")
    ext_man_expr = "%.%d%" .. ext_man .. "$"
end
function python_alternative_names(arg, binsuffix, keep_path_unmangled)
    local link, name, path
    name = arg:basename()
    local man_ending = arg:match(ext_man_expr) or arg:match("%.%d$")
    if arg:startswith("/") then
        link = arg
    elseif man_ending then
        link = mandir .. "/man" .. man_ending:sub(2,2) .. "/" .. arg
    else
        link = bindir .. "/" .. arg
    end
    if man_ending then
        path = link:sub(1, -man_ending:len()-1) .. "-" .. binsuffix .. man_ending
    else
        path = link .. "-" .. binsuffix
    end
    -- now is the time to append ext_man if appropriate
    -- "link" and "name" get ext_man always
    if ext_man ~= "" and man_ending and not arg:endswith(ext_man) then
        link = link .. ext_man
        name = name .. ext_man
        if not keep_path_unmangled then path = path .. ext_man end
    end
    return link, name, path
end
function python_install_alternative(flavor)
    local prio      = rpm.expand("%" .. flavor .. "_version_nodots")
    local binsuffix = rpm.expand("%" .. flavor .. "_bin_suffix")
    local params = {}
    for p in string.gmatch(rpm.expand("%*"), "%S+") do
        table.insert(params, p)
    end
    if #params == 0 then
        print("error")
        return
    end
    local link, name, path = python_alternative_names(params[1], binsuffix)
    print(string.format("update-alternatives --install %s %s %s %s", link, name, path, prio))
    table.remove(params, 1)
    for _, v in ipairs(params) do
        print(string.format(" \\\\\\n   --slave %s %s %s", python_alternative_names(v, binsuffix)))
    end
end
}
%_python_scan_spec() %{lua: \
    local last_python = rpm.expand("%python_for_executables")\
    local insert_last_python = false\
\
    pythons = {}\
    -- make sure that last_python is the last item in the list\
    for str in string.gmatch(rpm.expand("%pythons"), "%S+") do\
        if str == last_python then\
            insert_last_python = true\
        else\
            table.insert(pythons, str)\
        end\
    end\
    -- ...but check that it is actually in the buildset\
    if insert_last_python then table.insert(pythons, last_python) end\
\
    modname = rpm.expand("%name")\
    local spec_name_prefix = "python"\
    -- modname from name\
    local name = modname\
    for _,py in ipairs(pythons) do\
        if name:find(py .. "%-") == 1 then\
            spec_name_prefix = py\
            modname = name:sub(py:len() + 2)\
            break\
        end\
    end\
    -- try to match "python-"\
    if name == modname and name:find("python%-") == 1 then\
        spec_name_prefix = "python"\
        modname = name:sub(8)\
    end\
    -- if not found, modname == %name, spec_name_prefix == "python"\
\
    system_python = rpm.expand("%system_python")\
    -- is the package built for python2 as "python-foo" ?\
    old_python2 = rpm.expand("%python2_prefix") == "python"\
    is_called_python = spec_name_prefix == "python"\
\
    -- detect `flavor`, used for evaluating %ifmacros\
    if is_called_python then\
        -- either system_python (if found in %pythons)\
        -- or the last entry of %pythons\
        for _,py in ipairs(pythons) do\
            flavor = py\
            if flavor == system_python then break end\
        end\
    else\
        -- specname is something other than "python-", and it is a valid\
        -- python flavor (otherwise spec_name_prefix defaults to "python"\
        -- so `is_called_python` is true), so we use it literally\
        flavor = spec_name_prefix\
    end\
\
    -- find the spec file\
    specpath = name .. ".spec"\
    local locations = { rpm.expand("%_sourcedir"), rpm.expand("%_specdir"), "." }\
    for _,loc in ipairs(locations) do\
        local filename = loc .. "/" .. specpath\
        if posix.stat(filename, "mode") ~= nil then\
            specpath = filename\
            break\
        end\
    end\
}

%python_subpackages() %{lua: \
    rpm.expand("%_python_macro_init")\
    _python_subpackages_emitted = true\
\
    local current_flavor  = flavor\
    local original_flavor = rpm.expand("%python_flavor")\
\
    -- line processing functions\
    local function print_altered(line)\
        -- set %name macro to proper flavor-name\
        line = line:gsub("%%{?name}?", current_flavor .. "-" .. modname)\
        -- print expanded\
        print(rpm.expand(replace_macros(line, current_flavor)) .. "\\n")\
    end\
\
    local function ignore_line(line) end\
\
    local function files_line(line)\
        -- unexpand %license at start of line\
        if line:startswith("%license") then\
            line = "%" .. line\
        end\
        return print_altered(line)\
    end\
\
    local PROPERTY_COPY_UNMODIFIED = lookup_table { "Summary:", "Version:", "BuildArch:" }\
    local PROPERTY_COPY_MODIFIED = lookup_table {\
        "Requires:", "Provides:",\
        "Recommends:", "Suggests:",\
        "Conflicts:", "Obsoletes:",\
        "Supplements:", "Enhances:",\
        "%requires_eq", "%requires_ge",\
        "Requires(pre):", "Requires(preun):", "Requires(post):", "Requires(postun):",\
        "Requires(pretrans):", "Requires(posttrans):",\
    }\
\
    local function process_package_line(line)\
        -- This function processes lines like "Requires: something something".\
        -- "Requires: python-foo" -> "Requires: python3-foo"\
        -- "Requires: %{name} = %{version}" -> "Requires: python3-modname = %{version}"\
        -- "Supplements: packageand(python-a:python-b)" -> "Supplements: packageand(python3-a:python3-b)"\
        -- you get the idea.\
        -- TODO implement %$flavor_only support here?\
\
        -- first split Property: value\
        local property, value = line:match("^([A-Z%%]%S+)%s*(.*)$")\
\
        -- "python-foo" -> "python3-foo"\
        local function rename_package(package, flavor)\
            if package == "python" or package == flavor then\
                -- specialcase plain "python"\
                package = current_flavor\
            else\
                package = package:gsub("^" .. flavor .. "(%W)", current_flavor .. "%1")\
                package = package:gsub("^python(%W)", current_flavor .. "%1")\
            end\
            return package\
        end\
\
        -- split and rewrite "packageand(a:b:c)", using rename_package() for each of a, b, c\
        local function fix_packageand(packageand, flavor)\
            local inner = packageand:match("^packageand%((.*)%)$")\
            if not inner then return packageand end\
            local eat = inner\
            local result = "packageand("\
            while eat do\
                local idx = eat:find(":")\
                local n = ""\
                if idx then\
                    n = eat:sub(1, idx)\
                    eat = eat:sub(idx+1)\
                else\
                    n = eat\
                    eat = nil\
                end\
                n = n:gsub("^%s*", "")\
                result = result .. rename_package(n, flavor)\
            end\
            return result .. ")"\
        end\
\
        if PROPERTY_COPY_UNMODIFIED[property] then\
            print_altered(line)\
        elseif PROPERTY_COPY_MODIFIED[property] then\
            -- specifically handle %name macro before expansion\
            line = line:gsub("%%{?name}?", current_flavor .. "-" .. modname)\
            -- convert value using the appropriate function\
            if value:startswith("packageand") then\
                value = fix_packageand(value, flavor)\
            else\
                value = rename_package(value, flavor)\
            end\
            -- rely on print_altered to perform expansion on the result\
            print_altered(string.format("%s %s", property, value))\
        end\
    end\
\
    local auto_posttrans = {}\
    local auto_posttrans_current = {}\
    local auto_posttrans_backslash = false\
\
    local function expect_alternatives(line)\
        if auto_posttrans_backslash then\
            local apc = auto_posttrans_current\
            apc[#apc] = apc[#apc] .. "\\n" .. line\
            auto_posttrans_backslash = line:endswith("\\\\")\
        elseif line:startswith("%python_install_alternative")\
            or line:startswith("%{python_install_alternative") -- "}"\
            or line:startswith("%" .. flavor .. "_install_alternative")\
            or line:startswith("%{" .. flavor .. "_install_alternative") -- "}"\
            then\
                table.insert(auto_posttrans_current, line)\
                auto_posttrans_backslash = line:endswith("\\\\")\
        else\
            auto_posttrans_backslash = false\
        end\
        return print_altered(line)\
    end\
    -- end line processing functions\
\
    local function print_obsoletes(modname)\
        if current_flavor == "python2" then\
            print(rpm.expand("Obsoletes: python-" .. modname .. " < %{?epoch:%{epoch}:}%{version}-%{release}\\n"))\
            print(rpm.expand("Provides: python-" .. modname .. " = %{?epoch:%{epoch}:}%{version}-%{release}\\n"))\
        end\
    end\
\
    local function files_headline(flavor, param)\
        if not param then param = "" end\
        local append = param:match("(%-f%s+%S+)")\
        local nof = param:gsub("%-f%s+%S+%s*", "")\
        local python_files = param:match("%%{?python_files}?")\
        local subpkg = param:match("%%{python_files%s*(.-)}")\
        if subpkg then python_files = true end\
\
        if is_called_python and not python_files then\
            -- kingly hack. but RPM's native %error does not work.\
            local errmsg =\
                'error: Package with "python-" prefix must not contain unmarked "%files" sections.\\n' ..\
                'error: Use "%files %python_files" or "%files %{python_files foo} instead.\\n'\
            io.stderr:write(errmsg)\
            print(errmsg)\
            error('Invalid spec file')\
        end\
\
        local mymodname = nof\
        if python_files then mymodname = subpkg end\
        return "%files -n " .. package_name(flavor, modname, mymodname, append) .. "\\n"\
    end\
\
    local function section_headline(section, flavor, param)\
        if section == "files" then\
            return files_headline(flavor, param)\
        else\
            return "%" .. section .. " -n " .. package_name(flavor, modname, param) .. "\\n"\
        end\
    end\
\
    local python2_binsuffix = rpm.expand("%python2_bin_suffix")\
    local function dump_alternatives_posttrans()\
        if not old_python2 and current_flavor == "python2" then\
            for label, value in pairs(auto_posttrans) do\
                if value ~= false then\
                    print(section_headline("posttrans", current_flavor, label))\
                    for _,line in ipairs(value) do\
                        -- RPM needs {} characters in Lua macros to match, so\
                        -- this is an opening "{" for this one: ----------v\
                        firstarg = line:match("install_alternative%s+([^%s}]+)")\
                        if firstarg then\
                            local _,_,path = python_alternative_names(firstarg, python2_binsuffix)\
                            print(string.format('if [ -e "%s" ]; then\\n', path))\
                            print_altered(line)\
                            print("fi\\n")\
                        end\
                    end\
                end\
            end\
        end\
        auto_posttrans = {}\
    end\
\
    local function should_expect_alternatives(section, param)\
        if old_python2 or current_flavor ~= "python2" then return false end\
        if param == nil then param = "" end\
        if section == "posttrans" then\
            auto_posttrans[param] = false\
            return false\
        end\
        if section == "post" and auto_posttrans[param] ~= false then\
            auto_posttrans_current = {}\
            auto_posttrans[param] = auto_posttrans_current\
            return true\
        end\
        return false\
    end\
\
    local function match_braces(line)\
        local count = 0\
        for c in line:gmatch(".") do\
            if c == "{" then count = count + 1\
            elseif c == "}" and count > 0 then count = count - 1\
            end\
        end\
        return count == 0\
    end\
\
    local KNOWN_SECTIONS = lookup_table {"package", "description", "files", "prep",\
        "build", "install", "check", "clean", "pre", "post", "preun", "postun",\
        "pretrans", "posttrans", "changelog"}\
    local COPIED_SECTIONS = lookup_table {"description", "files",\
        "pre", "post", "preun", "postun", "pretrans", "posttrans"}\
\
    -- before we start, print Provides: python2-modname\
    if is_called_python and old_python2 then\
        print(rpm.expand("Provides: python2-" .. modname .. " = %{?epoch:%{epoch}:}%{version}-%{release}\\n"))\
    end\
\
    for _,python in ipairs(pythons) do\
        local is_current_flavor = python == flavor\
        -- "python-foo" case:\
        if is_called_python then\
            if old_python2 then\
                -- if we're in old-style package, "python" == "python2"\
                is_current_flavor = python == "python2"\
            else\
                -- else nothing is current flavor, always generate\
                is_current_flavor = false\
            end\
        end\
\
        current_flavor = python\
\
        -- rescan spec for each flavor\
        if not is_current_flavor then\
            local spec, err = io.open(specpath, "r")\
            if err then print ("bad spec " .. specpath) return end\
\
            rpm.define("python_flavor " .. python)\
\
            local section_function = process_package_line\
            print(section_headline("package", current_flavor, nil))\
            print_obsoletes(modname)\
\
            while true do\
                -- collect lines until braces match. it's what rpm does, kind of.\
                local eof = false\
                local line = spec:read()\
                if line == nil then break end\
                while not match_braces(line) do\
                    local nl = spec:read()\
                    if nl == nil then eof = true break end\
                    line = line .. "\\n" .. nl\
                end\
                if eof then break end\
                --io.stderr:write(current_flavor .. " >".. tostring(line) .."<\\n")\
\
                -- match section delimiter\
                local section_noparam = line:match("^%%(%S+)(%s*)$")\
                local section_withparam, param = line:match("^%%(%S+)%s+(.+)$")\
                local newsection = section_noparam or section_withparam\
\
                if KNOWN_SECTIONS[newsection] then\
                    -- enter new section\
                    if param and param:startswith("-n") then\
                        -- ignore named section\
                        section_function = ignore_line\
                    elseif newsection == "package" then\
                        print(section_headline("package", current_flavor, param))\
                        print_obsoletes(modname .. "-" .. param)\
                        section_function = process_package_line\
                    elseif newsection == "files" and current_flavor == flavor then\
                        section_function = ignore_line\
                    elseif COPIED_SECTIONS[newsection] then\
                        print(section_headline(newsection, current_flavor, param))\
                        if should_expect_alternatives(newsection, param) then\
                            section_function = expect_alternatives\
                        elseif newsection == "files" then\
                            section_function = files_line\
                        else\
                            section_function = print_altered\
                        end\
                    else\
                        section_function = ignore_line\
                    end\
                elseif line:startswith("%python_subpackages") then\
                    -- ignore\
                elseif line:startswith("%if") then\
                    -- RPM handles %if on top level, whole sections can be conditional.\
                    -- We must copy the %if declarations always, even if they are part\
                    -- of non-copied sections. Otherwise we miss this:\
                    -- %files A\
                    -- /bin/something\
                    -- %if %condition\
                    -- %files B\
                    -- /bin/otherthing\
                    -- %endif\
                    print_altered(line)\
                    -- We are, however, copying expanded versions. This way, specifically,\
                    -- macros like %ifpython3 are evaluated differently in the top-level spec\
                    -- itself and in the copied sections.\
                    --io.stderr:write(rpm.expand(line) .. "\\n")\
                elseif line:startswith("%else") or line:startswith("%endif") then\
                    print(line .. "\\n")\
                    --io.stderr:write(line .. "\\n")\
                else\
                    section_function(line)\
                end\
            end\
\
            dump_alternatives_posttrans()\
\
            spec:close()\
        end\
    end\
\
    -- restore %python_flavor for further processing\
    rpm.define("python_flavor " .. original_flavor)\
}

%python_exec(abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-=) %{lua: \
    local args = rpm.expand("%**")\
    print(rpm.expand("%{python_expand %__$python " .. args .. "}"))\
}

%python_expand(abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-=) %{lua: \
    -- force spec scan\
    rpm.expand("%_python_macro_init")\
    local args = rpm.expand("%**")\
    for _, python in ipairs(pythons) do\
        print(rpm.expand("%{_python_use_flavor " .. python .. "}\\n"))\
        local cmd = replace_macros(args, python)\
        cmd = cmd:gsub("$python", python)\
        print(rpm.expand(cmd .. "\\n"))\
    end\
}

%python_build(abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-=) %{lua: \
    rpm.expand("%_python_macro_init")\
    for _, python in ipairs(pythons) do\
        print(rpm.expand("%" .. python .. "_build %**"))\
    end\
}

%python_install(abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-=) %{lua: \
    rpm.expand("%_python_macro_init")\
    for _, python in ipairs(pythons) do\
        print(rpm.expand("%" .. python .. "_install %**"))\
    end\
}

%python_files() %{lua: \
    rpm.expand("%_python_macro_init")\
    local nparams = rpm.expand("%#")\
    local param = ""\
    if tonumber(nparams) > 0 then param = rpm.expand("%1") end\
\
    print("-n " .. package_name(flavor, modname, param))\
\
    if not _python_subpackages_emitted then\
        print("\\n/%python_subpackages_macro_not_present\\n")\
        io.stderr:write("%python_subpackages macro not present\\n"\
            .. "(To get rid of this error, either add a %python_subpackages macro to preamble "\
            .. "or remove %python_files.\\n")\
        error("%python_subpackages macro not present\\n")\
    end\
}

%python_clone(a) %{lua: \
    rpm.expand("%_python_macro_init")\
    local param = rpm.expand("%1")\
    local link, name, path\
    for _, python in ipairs(pythons) do\
        local binsuffix = rpm.expand("%" .. python .. "_bin_suffix")\
        link,name,path = python_alternative_names(param, binsuffix, true)\
        print(rpm.expand(string.format("cp %s %s\\n", param, path)))\
        print(rpm.expand(string.format("sed -ri '1s@#!.*python.*@#!/usr/bin/%s@' %s\\n", python, path)))\
    end\
\
    -- %python_clone -a\
    if rpm.expand("%{?-a}") == "-a" then\
        local buildroot = rpm.expand("%{buildroot}")\
        if link:startswith(buildroot) then link = link:sub(buildroot:len() + 1) end\
        print(rpm.expand(string.format("%%{prepare_alternative -t %s %s}\\n", link, name)))\
    end\
}

%python_module() %{lua: \
    rpm.expand("%_python_macro_init")\
    local params = rpm.expand("%**")\
    for _, python in ipairs(pythons) do\
        if python == "python2" then\
            print(rpm.expand("%python2_prefix") .. "-" .. params)\
        else\
            print(python .. "-" .. params)\
        end\
        print(" ")\
    end\
}
### LUA-MACROS ###


%_python_macro_init %{_python_definitions}%{_python_scan_spec}%{lua: rpm.define("_python_macro_init %{nil}")}
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