dependencies: remove sole Perl dependency in ORFS

Python is endemic, Perl was used in one place

Signed-off-by: Øyvind Harboe <[email protected]>

Author: oharboe

flow/Makefile

@@ -207,7 +207,9 @@ $(DONT_USE_LIBS): $$(filter %$$(@F) %$$(@F).gz,$(LIB_FILES))
 	$(PYTHON_EXE) $(UTILS_DIR)/preprocessLib.py -i $^ -o $@
 
 $(OBJECTS_DIR)/lib/merged.lib: $(DONT_USE_LIBS)
-	$(UTILS_DIR)/mergeLib.pl $(PLATFORM)_merged $(DONT_USE_LIBS) > $@
+	$(UTILS_DIR)/mergeLib.pl $(PLATFORM)_merged $(DONT_USE_LIBS) > $@.old
+	$(PYTHON_EXE) $(UTILS_DIR)/merge_lib.py $(PLATFORM)_merged $(DONT_USE_LIBS) > $@
+	diff -u $@.old $@ || (echo "Merged library differs from original!"; exit 1)
 
 # Pre-process KLayout tech
 # ==============================================================================

flow/util/merge_lib.py

@@ -0,0 +1,56 @@
+#!/usr/bin/env python3
+
+import re
+import sys
+
+
+def process_header(filename, sclname):
+    with open(filename, "r") as fh:
+        for line in fh:
+            if re.search(r"library\s*\(", line):
+                print(f"library ({sclname}) {{")
+                continue
+            if re.match(r"^[\t ]*cell\s*\(", line):
+                break
+            print(line, end="")
+
+
+def process_cells(filename):
+    with open(filename, "r") as fh:
+        flag = 0  # brace depth
+        for line in fh:
+            # Match 'cell ( ... )' with optional whitespace
+            if re.match(r"^[\t ]*cell\s*\(", line):
+                if flag != 0:
+                    raise RuntimeError(
+                        "Error! new cell before finishing the previous one!"
+                    )
+                print()  # print blank line like Perl
+                print(line, end="")
+                flag = 1  # entering a cell block
+            elif flag > 0:
+                # Increase/decrease brace depth
+                flag += line.count("{")
+                flag -= line.count("}")
+                print(line, end="")
+
+                # Optionally: reset flag to 0 here if it's finished
+                # But not necessary unless you're adding post-processing
+
+
+def main():
+    if len(sys.argv) < 3:
+        print("use: mergeLib.py new_library_name lib1 lib2 lib3 ....")
+        sys.exit(1)
+
+    sclname = sys.argv[1]
+    files = sys.argv[2:]
+
+    process_header(files[0], sclname)
+    for file in files:
+        process_cells(file)
+    print("\n}")
+
+
+if __name__ == "__main__":
+    main()