epm: add assure_exists_erc and use it

bin/epm-checkpkg

@@ -53,7 +53,7 @@ check_pkg_integrity()
 		true
 		;;
 	*)
-		assure_exists erc || epm ei erc || fatal "erc is not available. can't check the package"
+		assure_exists_erc
 		docmd erc test "$PKG" && return
 		;;
 	esac

bin/epm-repack

@@ -250,7 +250,7 @@ __prepare_source_package()
         [ -x "$alpkg" ] || docmd chmod u+x $verbose "$alpkg"
         ./$alpkg --appimage-extract || fatal
         alpkg=$PKGNAME-$VERSION.tar
-        assure_exists erc || epm ei erc || fatal
+        assure_exists_erc
         # make a tar for alien
         a= erc a $alpkg squashfs-root
         return
@@ -259,7 +259,7 @@ __prepare_source_package()
     __set_version_pkgname $alpkg
     if [ -n "$VERSION" ] ; then
         # TODO: don't use erc for detect type? then we potentially can skip install it
-        assure_exists erc || epm ei erc || fatal
+        assure_exists_erc
         pkgtype="$(a= erc type $alpkg)"
         local newalpkg
         newalpkg=$PKGNAME-$VERSION.$pkgtype
@@ -273,7 +273,7 @@ __prepare_source_package()
             # converts directly unsupported formats
             newalpkg=$PKGNAME-$VERSION.tar
             #newalpkg=$(basename $alpkg .$pkgtype).tar
-            assure_exists erc || epm ei erc || fatal
+            assure_exists_erc
             a= erc repack $alpkg $newalpkg || fatal
         fi
         if [ "$alpkg" != "$newalpkg" ] ; then

bin/epm-sh-functions

@@ -496,6 +496,13 @@ assure_exists()
 	( direct='' epm_assure "$1" $package $3 ) || fatal "Can't assure in '$1' command from $package$textpackage package"
 }
 
+assure_exists_erc()
+{
+	load_helper epm-assure
+	local package="erc"
+	( direct='' epm_assure "$package" ) || epm ei erc || fatal "erc is not available to install."
+}
+
 # will replaced within disabled_eget in packaged version
 eget()
 {