tests/make_graph: delay capturing screen geometry until is actually n…

…eeded

Co-authored-by: Martin Evgeniev <[email protected]>

tests/make_graph

@@ -14,15 +14,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-lines=$(tput lines)
-columns=$(tput cols)
-
 if [ $# -ne 1 ]; then
     echo "Usage: $0 results_dir"
     exit 1
 fi
 
-
 dir="$1"
 metric="$2"
 
@@ -49,6 +45,9 @@ else
     echo 'Using cached /tmp/data.'
 fi
 
+lines=$(tput lines)
+columns=$(tput cols)
+
 while dialog --separate-output                                                                \
              --buildlist 'Choose functions'                                                   \
              $lines $columns $lines                                                           \