def install(package_specifier):
"""Install a package."""
project_id = package_specifier.project
# Look up project.
project = recipe.get_project(project_id)
if not project:
return error("No such project.")
# Ensure not already installed.
if find_installed_packages(package_specifier):
return error("Already installed.")
# Create a package representing an installed instance of the project with
# the given parameters.
package = factory(project, package_specifier)
if package is no_factory:
return error("Not installable.")
if not package:
return error("Invalid configuration.")
if isinstance(package, basestring):
return error(package)
assert package_specifier.match(package)
# Install to default location.
package[a_location] = join(paths.packages, package.project.name)
installer(package)
# Update database.
with catalogue.modify(catalogue_path) as cat:
cat[package.project.id].append(package)
# If no packages from this project are already selected, select this one.
selected = select.get_selected_packages()
if not any(p for p in selected if p.project.id == project_id):
select.select_package(package)
def deselect_package(package):
with catalogue.modify(segment_path) as segment:
remove_all(segment[package.project.id], package)
environment.reload()
def select_package(package):
with catalogue.modify(segment_path) as segment:
segment[package.project.id].append(package)
environment.reload()
