Uses/electronfix.mk: Framework for quick porting of Electron apps.

The idea behind this USES is to take a binary distribution of some Electron app
and replace Linux binaries with the native ones. Not only this allows for
quick porting, but it is also a way to get closed-source Electron apps (Obsidian,
XMind) working on FreeBSD.

Sponsored by:	Serenity Cybersecurity, LLC

Mk/Uses/electronfix.mk

@@ -0,0 +1,61 @@
+# Provide support for easy porting of Electron applications that are distributed
+# in binary form.
+#
+# Feature:	electronfix
+# Usage:	USES=electronfix:version
+#
+# An example usage might be:
+#         USES=   electronfix:24
+#
+# Variables, which can be set by the port:
+#
+#  ELECTRONFIX_SYMLINK_FILES	List of files to be symlinked from Electron distribution.
+#
+#  ELECTRONFIX_MAIN_EXECUTABLE	File name of the main executable to be replaced
+#				with the original Electron binary.
+
+.if !defined(_INCLUDE_USES_ELECTRONFIX_MK)
+_INCLUDE_USES_ELECTRONFIX_MK=	yes
+
+_ELECTRONFIX_MK_VALID_VERSIONS=	22 23 24 25
+
+# === parse version arguments ===
+_ELECTRONFIX_MK_VERSION=	# empty
+.  for _ver in ${_ELECTRONFIX_MK_VALID_VERSIONS}
+.    if ${electronfix_ARGS:M${_ver}}
+.      if !empty(_ELECTRONFIX_MK_VERSION)
+BROKEN=		USES=electronfix:${electronfix_ARGS} contains multiple version definitions
+.      else
+_ELECTRONFIX_MK_VERSION=	${_ver}
+.      endif
+.    endif
+.  endfor
+
+BUILD_DEPENDS+=	electron${_ELECTRONFIX_MK_VERSION}:devel/electron${_ELECTRONFIX_MK_VERSION}
+RUN_DEPENDS+=	electron${_ELECTRONFIX_MK_VERSION}:devel/electron${_ELECTRONFIX_MK_VERSION}
+
+ELECTRONFIX_SYMLINK_FILES?= \
+			chromedriver \
+			libEGL.so \
+			libGLESv2.so \
+			libffmpeg.so \
+			libvk_swiftshader.so \
+			libvulkan.so \
+			resources.pak \
+			snapshot_blob.bin \
+			v8_context_snapshot.bin
+
+_USES_install=		701:electronfix-post-install
+
+electronfix-post-install:
+	${RM} ${STAGEDIR}${DATADIR}/chrome-sandbox
+	${RM} ${STAGEDIR}${DATADIR}/libvulkan.so.1
+.  for f in ${ELECTRONFIX_SYMLINK_FILES}
+	${RM} ${STAGEDIR}${DATADIR}/${f}
+	${LN} -s ${LOCALBASE}/share/electron${_ELECTRONFIX_MK_VERSION}/${f} ${STAGEDIR}${DATADIR}/${f}
+.  endfor
+.  ifdef ELECTRONFIX_MAIN_EXECUTABLE
+# We have to copy the electron binary instead of symlinking
+	${CP} ${LOCALBASE}/share/electron${_ELECTRONFIX_MK_VERSION}/electron ${STAGEDIR}${DATADIR}/${ELECTRONFIX_MAIN_EXECUTABLE}
+.  endif
+.endif