-- Convenience Lua functions that can be used within Python srpm/rpm macros

-- Determine alternate names provided from the given name.

-- Used in pythonname provides generator, python_provide and py_provides.

-- There are 2 rules:

--  python3-foo  -> python-foo, python3X-foo

--  python3X-foo -> python-foo, python3-foo

-- There is no python-foo -> rule, python-foo packages are version agnostic.

-- Returns a table/array with strings. Empty when no rule matched.

local function python_altnames(name)

  local xy = rpm.expand('%{__default_python3_pkgversion}')

  local altnames = {}

  local replaced

  -- NB: dash needs to be escaped!

  if name:match('^python3%-') then

    for i, prefix in ipairs({'python-', 'python' .. xy .. '-'}) do

      replaced = name:gsub('^python3%-', prefix)

      table.insert(altnames, replaced)

    end

  elseif name:match('^python' .. xy .. '%-') then

    for i, prefix in ipairs({'python-', 'python3-'}) do

      replaced = name:gsub('^python' .. xy .. '%-', prefix)

      table.insert(altnames, replaced)

    end

  end

  return altnames

end

-- For any given name and epoch-version-release, return provides except self.

-- Uses python_altnames under the hood

-- Returns a table/array with strings.

local function python_altprovides(name, evr)

  -- global cache that tells what provides were already processed

  if __python_altnames_provides_beenthere == nil then

    __python_altnames_provides_beenthere = {}

  end

  __python_altnames_provides_beenthere[name .. ' ' .. evr] = true

  local altprovides = {}

  for i, altname in ipairs(python_altnames(name)) do

    table.insert(altprovides, altname .. ' = ' .. evr)

  end

  return altprovides

end

-- Like python_altprovides but only return something once.

-- For each argument can only be used once, returns nil otherwise.

-- Previous usage of python_altprovides counts as well.

local function python_altprovides_once(name, evr)

  -- global cache that tells what provides were already processed

  if __python_altnames_provides_beenthere == nil then

    __python_altnames_provides_beenthere = {}

  end

  if __python_altnames_provides_beenthere[name .. ' ' .. evr] == nil then

    __python_altnames_provides_beenthere[name .. ' ' .. evr] = true

    return python_altprovides(name, evr)

  else

    return nil

  end

end

return {

  python_altnames = python_altnames,

  python_altprovides = python_altprovides,

  python_altprovides_once = python_altprovides_once,

}