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|
"""GHCi REPL support"""
load(":private/context.bzl", "render_env")
load(":private/packages.bzl", "expose_packages", "pkg_info_to_compile_flags")
load(
":private/path_utils.bzl",
"get_lib_name",
"is_shared_library",
"link_libraries",
"ln",
"target_unique_name",
)
load(":providers.bzl", "get_libs_for_ghc_linker")
load(
":private/set.bzl",
"set",
)
load("@bazel_skylib//lib:paths.bzl", "paths")
load("@bazel_skylib//lib:shell.bzl", "shell")
def build_haskell_repl(
hs,
ghci_script,
ghci_repl_wrapper,
user_compile_flags,
repl_ghci_args,
hs_info,
output,
package_databases,
version,
lib_info = None):
"""Build REPL script.
Args:
hs: Haskell context.
hs_info: HaskellInfo.
package_databases: package caches excluding the cache file of the package
we're creating a REPL for.
lib_info: If we're building REPL for a library target, pass
HaskellLibraryInfo here, otherwise it should be None.
Returns:
None.
"""
# The base and directory packages are necessary for the GHCi script we use
# (loads source files and brings in scope the corresponding modules).
args = ["-package", "base", "-package", "directory"]
pkg_ghc_info = expose_packages(
hs_info,
lib_info,
use_direct = False,
use_my_pkg_id = None,
custom_package_databases = package_databases,
version = version,
)
args += pkg_info_to_compile_flags(pkg_ghc_info)
lib_imports = []
if lib_info != None:
for idir in set.to_list(hs_info.import_dirs):
args += ["-i{0}".format(idir)]
lib_imports.append(idir)
link_ctx = hs_info.cc_dependencies.dynamic_linking
libs_to_link = link_ctx.dynamic_libraries_for_runtime.to_list()
# External C libraries that we need to make available to the REPL.
libraries = link_libraries(libs_to_link, args)
# Transitive library dependencies to have in runfiles.
(library_deps, ld_library_deps, ghc_env) = get_libs_for_ghc_linker(
hs,
hs_info.transitive_cc_dependencies,
path_prefix = "$RULES_HASKELL_EXEC_ROOT",
)
library_path = [paths.dirname(lib.path) for lib in library_deps]
ld_library_path = [paths.dirname(lib.path) for lib in ld_library_deps]
repl_file = hs.actions.declare_file(target_unique_name(hs, "repl"))
add_sources = ["*" + f.path for f in set.to_list(hs_info.source_files)]
ghci_repl_script = hs.actions.declare_file(
target_unique_name(hs, "ghci-repl-script"),
)
hs.actions.expand_template(
template = ghci_script,
output = ghci_repl_script,
substitutions = {
"{ADD_SOURCES}": " ".join(add_sources),
"{COMMANDS}": "",
},
)
# Extra arguments.
# `compiler flags` is the default set of arguments for the repl,
# augmented by `repl_ghci_args`.
# The ordering is important, first compiler flags (from toolchain
# and local rule), then from `repl_ghci_args`. This way the more
# specific arguments are listed last, and then have more priority in
# GHC.
# Note that most flags for GHCI do have their negative value, so a
# negative flag in `repl_ghci_args` can disable a positive flag set
# in `user_compile_flags`, such as `-XNoOverloadedStrings` will disable
# `-XOverloadedStrings`.
args += hs.toolchain.compiler_flags + user_compile_flags + hs.toolchain.repl_ghci_args + repl_ghci_args
hs.actions.expand_template(
template = ghci_repl_wrapper,
output = repl_file,
substitutions = {
"{ENV}": render_env(ghc_env),
"{TOOL}": hs.tools.ghci.path,
"{ARGS}": " ".join(
[
"-ghci-script",
paths.join("$RULES_HASKELL_EXEC_ROOT", ghci_repl_script.path),
] + [
shell.quote(a)
for a in args
],
),
},
is_executable = True,
)
ghc_info = struct(
has_version = pkg_ghc_info.has_version,
library_path = library_path,
ld_library_path = ld_library_path,
packages = pkg_ghc_info.packages,
package_ids = pkg_ghc_info.package_ids,
package_dbs = pkg_ghc_info.package_dbs,
lib_imports = lib_imports,
libraries = libraries,
execs = struct(
ghc = hs.tools.ghc.path,
ghci = hs.tools.ghci.path,
runghc = hs.tools.runghc.path,
),
flags = struct(
compiler = user_compile_flags,
toolchain_compiler = hs.toolchain.compiler_flags,
repl = repl_ghci_args,
toolchain_repl = hs.toolchain.repl_ghci_args,
),
)
ghc_info_file = hs.actions.declare_file(
target_unique_name(hs, "ghc-info"),
)
hs.actions.write(
output = ghc_info_file,
content = ghc_info.to_json(),
)
# XXX We create a symlink here because we need to force
# hs.tools.ghci and ghci_script and the best way to do that is
# to use hs.actions.run. That action, in turn must produce
# a result, so using ln seems to be the only sane choice.
extra_inputs = depset(transitive = [
depset([
hs.tools.ghci,
ghci_repl_script,
repl_file,
ghc_info_file,
]),
set.to_depset(package_databases),
depset(library_deps),
depset(ld_library_deps),
set.to_depset(hs_info.source_files),
])
ln(hs, repl_file, output, extra_inputs)
|
