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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
ebuild.py
~~~~~~~~~~~~~
ebuild generation
:copyright: (c) 2013-2015 by Jauhien Piatlicki
:license: GPL-2, see LICENSE for more details.
"""
from .compatibility import basestring
from .exceptions import DependencyError
class EbuildGenerator(object):
"""
Ebuild generator.
"""
def __init__(self, package_db):
"""
Args:
package_db: Package database.
"""
self.package_db = package_db
def generate(self, package, ebuild_data=None):
"""
Generate an ebuild for a package.
Args:
package: g_collections.Package instance.
ebuild_data: Dictionary with ebuild data.
Returns:
Ebuild source as a list of strings.
"""
#a possible exception should be catched in the caller
if not ebuild_data:
ebuild_data = self.package_db.get_package_description(package)
ebuild_data = self.process_ebuild_data(ebuild_data)
ebuild = self.get_template(package, ebuild_data)
ebuild = self.process(ebuild, ebuild_data)
ebuild = self.postprocess(ebuild, ebuild_data)
return ebuild
def process_ebuild_data(self, ebuild_data):
"""
A hook allowing changing ebuild_data before ebuild generation.
Args:
ebuild_data: Dictinary with ebuild data.
Returns:
Dictinary with ebuild data.
"""
return ebuild_data
def process(self, ebuild, ebuild_data):
"""
Fill ebuild template with data.
Args:
ebuild: Ebuild template.
ebuild_data: Dictionary with ebuild data.
Returns:
Ebuild source as a list of strings.
"""
result = []
for line in ebuild:
error = ""
try:
line = line % ebuild_data
except ValueError as e:
error = str(e)
if error:
error = "substitution failed in line '" + line + "': " + error
raise DependencyError(error)
result.append(line)
return result
def get_template(self, package, ebuild_data):
"""
Generate ebuild template. Should be overriden.
Args:
package: g_collections.Package instance.
ebuild_data: Dictionary with ebuild data.
Returns:
Ebuild template.
"""
ebuild = []
return ebuild
def postprocess(self, ebuild, ebuild_data):
"""
A hook for changing of a generated ebuild.
Args:
ebuild: Ebuild source as a list of strings.
ebuild_data: Dictionary with ebuild data.
Returns:
Ebuild source as a list of strings.
"""
return ebuild
class EbuildGeneratorFromFile(EbuildGenerator):
"""
Ebuild generators that takes templates from files.
"""
def __init__(self, package_db, filename=""):
super(EbuildGeneratorFromFile, self).__init__(package_db)
self.filename = filename
def get_template(self, package, ebuild_data):
"""
Generate ebuild template.
Args:
package: g_collections.Package instance.
ebuild_data: Dictionary with ebuild data.
Returns:
Ebuild template.
"""
name = self.get_template_file(package, ebuild_data)
with open(name, 'r') as f:
ebuild = f.read().split('\n')
if ebuild[-1] == '':
ebuild = ebuild[:-1]
return ebuild
def get_template_file(self, package, ebuild_data):
"""
Get template filename for a package. Should be overriden.
Args:
package: g_collections.Package instance.
ebuild_data: Dictionary with ebuild data.
Returns:
Template filename.
"""
return self.filename
class DefaultEbuildGenerator(EbuildGenerator):
"""
Default ebuild generator.
Takes a layout dictinary that describes ebuild structure and generates
an ebuild template basing on it.
Layout has entries for vars and inherited eclasses. Each entry is a list.
Entries are processed in the following order:
vars_before_inherit
inherit
vars_after_inherit
vars_after_description
vars_after_keywords
inherit entry is just a list of eclass names.
vars* entries are lists of variables in tw0 possible formats:
1. A string with variable name
2. A dictinary with entries:
name: variable name
value: variable value
raw: if present, no quotation of value will be done
Variable names are automatically transformed to the upper-case.
"""
def __init__(self, package_db, layout):
super(DefaultEbuildGenerator, self).__init__(package_db)
self.template = ["# automatically generated by g-sorcery",
"# please do not edit this file",
""]
if hasattr(layout, "eapi"):
self.template.append("EAPI=%s" % layout.eapi)
else:
self.template.append("EAPI=8")
self.template.append("")
if hasattr(layout, "vars_before_inherit"):
self._append_vars_to_template(layout.vars_before_inherit)
self.template.append("")
if hasattr(layout, "inherit"):
self.template.append("inherit " + " ".join(layout.inherit))
self.template.append("")
if hasattr(layout, "vars_after_inherit"):
self._append_vars_to_template(layout.vars_after_inherit)
self.template.append("")
self.template.append('DESCRIPTION="%(description)s"')
self.template.append("")
if hasattr(layout, "vars_after_description"):
self._append_vars_to_template(layout.vars_after_description)
self.template.append("")
self.template.append('SLOT="0"')
self.template.append('KEYWORDS="~amd64 ~x86"')
self.template.append("")
if hasattr(layout, "vars_after_keywords"):
self._append_vars_to_template(layout.vars_after_keywords)
self.template.append("")
def _append_vars_to_template(self, variables):
"""
Add a list of variables to the end of template.
Args:
variables: List of variables.
"""
for var in variables:
if isinstance(var, basestring):
self.template.append(var.upper() + '="%(' + var + ')s"')
else:
if "raw" in var:
quote = ''
else:
quote = '"'
if "value" in var:
self.template.append(var["name"].upper() \
+ '=' + quote + var["value"] + quote)
else:
self.template.append(var["name"].upper() + '=' + quote + '%(' + var["name"] + ')s' + quote)
def get_template(self, package, ebuild_data):
"""
Generate ebuild template.
Args:
package: g_collections.Package instance.
ebuild_data: Dictionary with ebuild data.
Returns:
Ebuild template.
"""
return self.template
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