Add gen_ag_template script

Author: Kyle-Ye

.gitignore

@@ -8,4 +8,4 @@ DerivedData/
 .netrc
 coverage.txt
 TODO.md
-template.swiftinterface
+.ag_template/

Scripts/gen_ag_interface_template.sh

@@ -0,0 +1,34 @@
+#!/bin/zsh
+
+# A `realpath` alternative using the default C implementation.
+filepath() {
+  [[ $1 = /* ]] && echo "$1" || echo "$PWD/${1#./}"
+}
+
+gen_interface() {
+  swift build -c release -Xswiftc -emit-module-interface -Xswiftc -enable-library-evolution -Xswiftc -no-verify-emitted-module-interface -Xswiftc -package-name -Xswiftc OpenGraph -Xswiftc -Osize
+
+  mkdir -p .ag_template
+  cp .build/release/Modules/OpenGraph.swiftinterface .ag_template/template.swiftinterface
+
+  sed -i '' '1,4d' .ag_template/template.swiftinterface
+  sed -i '' 's/@_exported public import OpenGraphCxx/@_exported public import AttributeGraph/g' .ag_template/template.swiftinterface
+  sed -i '' 's/OpenGraphCxx\.//g' .ag_template/template.swiftinterface
+  sed -i '' 's/OpenGraph/AttributeGraph/g' .ag_template/template.swiftinterface
+  sed -i '' 's/OPENGRAPH/ATTRIBUTEGRAPH/g' .ag_template/template.swiftinterface
+  sed -i '' 's/OG/AG/g' .ag_template/template.swiftinterface
+
+  echo "Generated template.swiftinterface successfully"
+}
+
+gen_header() {
+  # TODO: Implement header generation
+  echo "Generated template header successfully"
+}
+
+OPENGRAPH_ROOT="$(dirname $(dirname $(filepath $0)))"
+
+cd $OPENGRAPH_ROOT
+
+gen_interface
+gen_header