Export variable and constraints names in LP files and add new lp-debug io_api

Author: olivierjuan

linopy/io.py

@@ -78,15 +78,15 @@ def print_variable_anonymous(var):
         def print_constraint_anonymous(cons):
             return f"c{cons}"
 
-        return print_variable_anonymous, print_constraint_anonynous
+        return print_variable_anonymous, print_constraint_anonymous
     else:
 
         def print_variable(var):
             name, coord = m.variables.get_label_position(var)
             name = clean_name(name)
             return f"{name}{print_coord(coord)}"
 
-        def print_constraint(constraints, cons):
+        def print_constraint(cons):
             name, coord = m.constraints.get_label_position(cons)
             name = clean_name(name)
             return f"{name}{print_coord(coord)}"
@@ -709,6 +709,8 @@ def to_file(
 
     if io_api == "lp":
         to_lp_file(m, fn, integer_label, slice_size=slice_size, progress=progress)
+    elif io_api == "lp-debug":
+            to_lp_file(m, fn, integer_label, slice_size=slice_size, progress=progress, anonymously=False)
     elif io_api == "lp-polars":
         to_lp_file_polars(
             m, fn, integer_label, slice_size=slice_size, progress=progress
@@ -726,7 +728,7 @@ def to_file(
         h.writeModel(str(fn))
     else:
         raise ValueError(
-            f"Invalid io_api '{io_api}'. Choose from 'lp', 'lp-polars' or 'mps'."
+            f"Invalid io_api '{io_api}'. Choose from 'lp', 'lp-debug', 'lp-polars' or 'mps'."
         )
 
     return fn

linopy/solvers.py

@@ -43,7 +43,7 @@
     "mindopt",
 ]
 
-FILE_IO_APIS = ["lp", "lp-polars", "mps"]
+FILE_IO_APIS = ["lp", "lp-debug", "lp-polars", "mps"]
 IO_APIS = FILE_IO_APIS + ["direct"]
 
 available_solvers = []

test/test_io.py

@@ -126,6 +126,16 @@ def test_to_file_lp(model, tmp_path):
     gurobipy.read(str(fn))
 
 
+@pytest.mark.skipif("gurobi" not in available_solvers, reason="Gurobipy not installed")
+def test_to_file_lp_debug(model, tmp_path):
+    import gurobipy
+
+    fn = tmp_path / "test.lp"
+    model.to_file(fn, io_api='lp-debug')
+
+    gurobipy.read(str(fn))
+
+
 @pytest.mark.skipif("gurobi" not in available_solvers, reason="Gurobipy not installed")
 def test_to_file_lp_None(model):
     import gurobipy