allow setting stdout=False in solver to disable stdout even for large…

…r models

linopy/io.py

@@ -311,9 +311,13 @@ def integers_to_file(
         f.writelines(batch)
 
 
-def to_lp_file(m: Model, fn: Path, integer_label: str, slice_size: int = 10_000_000):
-    log = m._xCounter > 10_000
-
+def to_lp_file(
+    m: Model,
+    fn: Path,
+    integer_label: str,
+    slice_size: int = 10_000_000,
+    log: bool = True,
+) -> None:
     batch_size = 5000
 
     with open(fn, mode="w") as f:
@@ -559,9 +563,9 @@ def constraints_to_file_polars(m, f, log=False, lazy=False, slice_size=2_000_000
             # formatted.sink_csv(f,  **kwargs)
 
 
-def to_lp_file_polars(m, fn, integer_label="general", slice_size=2_000_000):
-    log = m._xCounter > 10_000
-
+def to_lp_file_polars(
+    m, fn, integer_label="general", slice_size=2_000_000, log: bool = True
+):
     with open(fn, mode="wb") as f:
         start = time.time()
 
@@ -583,6 +587,7 @@ def to_file(
     io_api: str | None = None,
     integer_label: str = "general",
     slice_size: int = 2_000_000,
+    log: bool | None = None,
 ) -> Path:
     """
     Write out a model to a lp or mps file.
@@ -597,10 +602,13 @@ def to_file(
     if io_api is None:
         io_api = fn.suffix[1:]
 
+    if log is None:
+        log = m._xCounter > 10_000
+
     if io_api == "lp":
-        to_lp_file(m, fn, integer_label, slice_size=slice_size)
+        to_lp_file(m, fn, integer_label, slice_size=slice_size, log=log)
     elif io_api == "lp-polars":
-        to_lp_file_polars(m, fn, integer_label, slice_size=slice_size)
+        to_lp_file_polars(m, fn, integer_label, slice_size=slice_size, log=log)
 
     elif io_api == "mps":
         if "highs" not in solvers.available_solvers:

linopy/model.py

@@ -969,6 +969,7 @@ def solve(
         sanitize_infinities: bool = True,
         slice_size: int = 2_000_000,
         remote: None = None,
+        log: bool | None = None,
         **solver_options,
     ) -> tuple[str, str]:
         """
@@ -1027,6 +1028,10 @@ def solve(
             Remote handler to use for solving model on a server. Note that when
             solving on a rSee
             linopy.remote.RemoteHandler for more details.
+        log : bool, optional
+            Whether to show a progress bar of writing the lp file. The default is
+            None, which means that the progress bar is shown if the model has more
+            than 10000 variables and constraints.
         **solver_options : kwargs
             Options passed to the solver.
 
@@ -1124,7 +1129,7 @@ def solve(
                     env=env,
                 )
             else:
-                problem_fn = self.to_file(to_path(problem_fn), io_api)
+                problem_fn = self.to_file(to_path(problem_fn), io_api, log=log)
                 result = solver.solve_problem_from_file(
                     problem_fn=to_path(problem_fn),
                     solution_fn=to_path(solution_fn),