Swift builder initial approaches

sconscontrib/SCons/Tool/swift/__init__.py

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+# MIT License
+#
+# Copyright The SCons Foundation
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
+# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+"""SCons.Tool.swift
+
+Tool-specific initialization for Swift.
+"""
+import SCons.Action
+import SCons.Builder
+import SCons.Util
+
+
+class ToolSwiftWarning(SCons.Warnings.SConsWarning):
+    pass
+
+
+class SwiftNotFound(ToolSwiftWarning):
+    pass
+
+
+SCons.Warnings.enableWarningClass(ToolSwiftWarning)
+
+
+def _detect(env):
+    """ Try to detect the swiftc binary """
+    try:
+        return env["swiftc"]
+    except KeyError:
+        pass
+
+    swift = env.WhereIs("swiftc")
+    if swift:
+        return swift
+
+    raise SCons.Errors.StopError(SwiftNotFound, "Could not detect swiftc executable")
+    return None
+
+#
+# Builders
+#
+swiftc_builder = SCons.Builder.Builder(
+    action=SCons.Action.Action("$SWIFTCCOM", "$SWIFTCCOMSTR"),
+    src_suffix="$SWIFTSUFFIX",
+    single_source=True,
+)  # file by file
+
+def Swift(env, target, source=None, *args, **kw):
+    """
+    A pseudo-Builder wrapper for the kotlinc executable.
+        kotlinc [options] file
+    """
+    if not SCons.Util.is_List(target):
+        target = [target]
+    if not source:
+        source = target[:]
+    if not SCons.Util.is_List(source):
+        source = [source]
+
+    result = []
+    for t, s in zip(target, source):
+        # Call builder
+        kotlin_class = swiftc_builder.__call__(env, t, s, **kw)
+        result.extend(kotlin_class)
+
+    return result
+
+def generate(env):
+    """ Add Builders and construction variables to the Environment. """
+    env["SWIFTC"] = _detect(env)
+
+    env.SetDefault(
+        SWIFTC="swiftc",
+        SWIFTSUFFIX=".swift",
+        SWIFTCFLAGS=SCons.Util.CLVar("-c"),
+        SWIFTCCOM="$SWIFTC $SWIFTCFLAGS $SOURCE",
+    )
+
+    env.AddMethod(Swift, "Swift")
+
+
+def exists(env):
+    return _detect(env)