get a techlib by name

src/kyupy/techlib.py

@@ -10,7 +10,6 @@ from itertools import product
 
 from . import bench
 
-
 class TechLib:
     """Class for standard cell library definitions.
 
@@ -641,3 +640,5 @@ $lpflow_inputisolatch_1  input(D,SLEEP_B) output(Q) Q=LATCH(D,SLEEP_B)
 """.replace('$','sky130_fd_sc_hd__'))
 """SkyWater 130nm High Density Digital Standard Cells (skywater-pdk-libs-sky130_fd_sc_hd).
 """
+
+techlib_by_name = {k: v for k, v in globals().items() if isinstance(v, TechLib)}