[beast: 66/70] V8BSE: use electron/package.json to detect electron version without DISPLAY

[Tim Janik <timj src gnome org>]

commit 05a38219ab34486f6050b6108cbf90a62da3cc0f
Author: Tim Janik <timj gnu org>
Date:   Fri Mar 24 17:52:03 2017 +0100

    V8BSE: use electron/package.json to detect electron version without DISPLAY
    
    Electron fails to display anything if started as 'electron --version'
    without $DISPLAY being set, which is likely to happen during build time.
    Reading node_modules/electron/package.json is a quick way to extract
    the electron version information without needing $DISPLAY.
    
    See: https://github.com/electron/electron/issues/8757
    
    Signed-off-by: Tim Janik <timj gnu org>

 ebeast/v8bse/Makefile.am |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/ebeast/v8bse/Makefile.am b/ebeast/v8bse/Makefile.am
index 3a18310..9f8be99 100644
--- a/ebeast/v8bse/Makefile.am
+++ b/ebeast/v8bse/Makefile.am
@@ -35,10 +35,13 @@ CLEANFILES += v8bse.node
 clean-local: clean-build
 clean-build: ; rm -rf build/
 NODE_GYP = $(strip \
-       HOME=../node_modules/.electron-gyp \
+       sed -n '/^ \ "version":/s/.*"\([0-9.]\+\)".*/\1/p' ../node_modules/electron/package.json > $@.tmpev \
+       && ELECTRON_VERSION=`grep '^[0-9.]\+$$' $@.tmpev` \
+       && rm $@.tmpev \
+       && HOME=../node_modules/.electron-gyp \
        CXX="$(CXX)" CXXFLAGS="$(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CXXFLAGS) $(CXXFLAGS)" \
        ../node_modules/.bin/node-gyp \
-       --target=$(shell ../node_modules/electron/dist/electron --version) \
+       --target="$$ELECTRON_VERSION" \
        $(if $(findstring 1, $(V)) , --verbose) \
 )