find-overlay-deps-closure.sh

#!/bin/bash

# Find the transitive closure of overlay dependencies for a single overlay.
# Runs the following command in a loop until the list stops growing:
# xcrun -sdk macosx clang -arch x86_64 -x objective-c - -M -fmodules < <(echo '@import SceneKit;@import AppKit;')
# There are two ways an overlay ``foo`` shows up in the xcrun output:
# 1) as Foo.framework
# 2) as /usr/include/foo/bar.h
# but not:
# 3) as /usr/include/foo/module.map or /usr/include/foo/modulemap.map
# Overlays that only show up as a module map are not a real dependency.
# Overlays that have a different name in Swift than in the output: Dispatch, ObjectiveC, XPC
# XCTest is hardcoded because this method doesn't work for it.

set -o pipefail
set -e

OVERLAY_NAME_ALTERNATION="AppKit|AssetsLibrary|AVFoundation|CallKit|CloudKit|Compression|Contacts|CoreAudio|CoreData|CoreGraphics|CoreImage|CoreLocation|CoreMedia|CryptoTokenKit|dispatch|Foundation|GameplayKit|GLKit|HomeKit|IOKit|Intents|MapKit|objc|OpenCL|os|Photos|QuartzCore|SafariServices|SceneKit|simd|SpriteKit|UIKit|WatchKit|XCTest|xpc"

functionfind_deps() {
local OVERLAY_ARG=$1
local SDK_ARG=$2
local ARCH_ARG=$3

local PROGRAM=""
# shellcheck disable=SC2013
foroverlayin$(sed "s/;/ /g"<<<"$OVERLAY_ARG");do
 regexp="ObjectiveC|objc|Dispatch|dispatch|XPC|xpc"
if [[ !$overlay=~$regexp ]];then
 PROGRAM+="@import $overlay;"
fi
done

local DEPS
 DEPS=$(xcrun -sdk "$SDK_ARG" clang -arch "$ARCH_ARG" -x objective-c - -M -fmodules <<<"$PROGRAM"2>&1)
local ERROR_REGEX="(.*error:.*)"
if [[ $DEPS=~$ERROR_REGEX ]];then
echo"${BASH_REMATCH[1]}">&2
exit 123
fi

local REGEX="./Frameworks/(${OVERLAY_NAME_ALTERNATION}).framework/.*|.*/usr/include/(xpc|dispatch|os|objc|simd|compression)/.*\.h"

# shellcheck disable=SC1004
 IFS='\
'
local USED_OVERLAYS=""
# shellcheck disable=SC2068
forlinein${DEPS[@]};do
if [[ $line=~$REGEX ]];then
if [[ ${BASH_REMATCH[1]}!="" ]];then
 USED_OVERLAYS+="${BASH_REMATCH[1]};"
elif [[ ${BASH_REMATCH[2]}=="dispatch" ]];then
 USED_OVERLAYS+="Dispatch;"
elif [[ ${BASH_REMATCH[2]}=="xpc" ]];then
 USED_OVERLAYS+="XPC;"
elif [[ ${BASH_REMATCH[2]}=="objc" ]];then
 USED_OVERLAYS+="ObjectiveC;"
elif [[ ${BASH_REMATCH[2]}!="" ]];then
 USED_OVERLAYS+="${BASH_REMATCH[2]};"
fi
fi
done

# Remove last ;
if [[ ${#USED_OVERLAYS}-gt 0 ]];then
 USED_OVERLAYS=${USED_OVERLAYS%?}
fi

 TRIMMED=$(tr ";""\n"<<<"$USED_OVERLAYS"| sort | uniq | tr "\n"";")
echo"${TRIMMED%?}"
}

if [ "$#"-ne 3 ];then
echo"error: $0 needs 3 params, instead got $#"
echo"usage: $0 Overlay sdk arch"
echo"example: $0 CloudKit macosx x86_64"
exit 234
fi

OVERLAY_ARG=$1
SDK_ARG=$2
ARCH_ARG=$3

OUT=$OVERLAY_ARG
LAST_OUT=$OVERLAY_ARG

# Hardcode XCTest because clang can't find its dependencies
if [[ $OVERLAY_ARG=="XCTest" ]];then
case"$SDK_ARG"in
 macosx)
 OUT="XCTest;AppKit;CoreData;CoreGraphics;CoreImage;Dispatch;Foundation;IOKit;ObjectiveC;QuartzCore;XPC;os"
 ;;
 iphoneos)
 OUT="XCTest;CoreAudio;CoreGraphics;CoreImage;CoreMedia;Dispatch;Foundation;ObjectiveC;QuartzCore;UIKit;os"
 ;;
 appletvos)
 OUT="XCTest;CoreGraphics;CoreImage;Dispatch;Foundation;ObjectiveC;QuartzCore;UIKit;os"
 ;;
*)
echo"Unknown SDK: $SDK_ARG"
exit 345
 ;;
esac
else
whiletrue;do
 OUT=$(find_deps "$LAST_OUT""$SDK_ARG""$ARCH_ARG")
if [[ "$LAST_OUT"=="$OUT" ]];then
break
fi
 LAST_OUT=$OUT
done
fi

echo"${OUT}"