epm pack common.sh: add get_json_value and use it

pack.d/1c-connect.sh

@@ -13,7 +13,7 @@ mv 1C-Connect-Linux-x64* opt/$PRODUCT
 
 echo "true" > ./opt/$PRODUCT/app/bin/updater
 
-VERSION="$(grep version_name opt/$PRODUCT/dist.json | sed -e 's|",.*||' -e 's|.*"||')"
+VERSION="$(get_json_value opt/$PRODUCT/dist.json version_name)"
 [ -n "$VERSION" ] || fatal "Can't get version from dist.json file."
 
 PKGNAME=$PRODUCT-$VERSION

pack.d/common.sh

@@ -78,6 +78,26 @@ has_wildcard()
     [ "${1/\*/}" != "$1" ]
 }
 
+# ["version"]
+parse_json_value()
+{
+    local field="$1"
+    echo "$field" | grep -q -E "^\[" || field='["'$field'"]'
+    epm tool json -b | grep -m1 -F "$field" | sed -e 's|.*[[:space:]]||' | sed -e 's|"\(.*\)"|\1|g'
+}
+
+# URL/file ["version"]
+get_json_value()
+{
+    if is_url "$1" ; then
+        eget -q -O- "$1" | parse_json_value "$2"
+    else
+        [ -s "$1" ] || fatal "File $1 is missed, can't get json"
+        parse_json_value "$2" < "$1"
+    fi
+}
+
+
 __handle_tarname()
 {
     # TODO: we don't know PKGNAME here

pack.d/postman.sh

@@ -15,7 +15,7 @@ erc unpack $BASENAME.tar.gz || fatal
 mkdir -p opt
 mv Postman/app opt/postman
 
-VERSION=$(cat "opt/postman/resources/app/package.json" | epm --inscript tool json -b | grep version | awk 'gsub(/"/, "", $2) {print $2}') #'
+VERSION="$(get_json_value opt/postman/resources/app/package.json version)"
 [ -n "$VERSION" ] || fatal "Can't get package version"
 
 install_file opt/postman/resources/app/assets/icon.png /usr/share/pixmaps/postman.png