From 88b4324ecb7f06fe31c0dfe62640d1594764a23f Mon Sep 17 00:00:00 2001
From: Gard Spreemann <gard.spreemann@epfl.ch>
Date: Wed, 24 Oct 2018 13:33:53 +0200
Subject: PETSc printing.

---
 src/options.cpp | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/src/options.cpp b/src/options.cpp
index a52a0bc..498267f 100644
--- a/src/options.cpp
+++ b/src/options.cpp
@@ -1,18 +1,18 @@
 #include <string>
-#include <iostream>
+#include <petscmat.h>
 
 #include "options.hpp"
 
 void print_usage(const std::string & invocation)
 {
-  std::cerr << "Usage:" << std::endl;
-  std::cerr << invocation << " " << usage_args << std::endl;
+  PetscPrintf(PETSC_COMM_WORLD, "Usage:\n");
+  PetscPrintf(PETSC_COMM_WORLD, "%s %s\n", invocation.c_str(), usage_args.c_str());
 }
 
 void print_help(const std::string & invocation)
 {
   print_usage(invocation);
-  std::cerr << "FIXME: Write help." << std::endl;
+  PetscPrintf(PETSC_COMM_WORLD, "FIXME: Write help.\n");
 }
 
 int parse_opts(int argc, char ** argv, Options & opts)
@@ -35,7 +35,7 @@ int parse_opts(int argc, char ** argv, Options & opts)
         opts.infile = std::string(argv[++i]);
       else
       {
-        std::cerr << "Missing argument to --laplacian." << std::endl;
+        PetscPrintf(PETSC_COMM_WORLD, "Missing argument to --laplacian.\n");
         print_usage(invocation);
         return 1;
       }
@@ -47,7 +47,7 @@ int parse_opts(int argc, char ** argv, Options & opts)
         opts.outfile_vals = std::string(argv[++i]);
       else
       {
-        std::cerr << "Missing argument to --vals." << std::endl;
+        PetscPrintf(PETSC_COMM_WORLD, "Missing argument to --vals.\n");
         print_usage(invocation);
         return 1;
       }
@@ -59,7 +59,7 @@ int parse_opts(int argc, char ** argv, Options & opts)
         opts.outfile_vecs = std::string(argv[++i]);
       else
       {
-        std::cerr << "Missing argument to --vecs." << std::endl;
+        PetscPrintf(PETSC_COMM_WORLD, "Missing argument to --vecs.\n");
         print_usage(invocation);
         return 1;
       }
@@ -67,27 +67,27 @@ int parse_opts(int argc, char ** argv, Options & opts)
 
     else
     {
-      std::cout << "The argument \"" << arg << "\" will be dealt with by PETSc/SLEPc if they understand it. Otherwise it will be silently ignored." << std::endl;
+      PetscPrintf(PETSC_COMM_WORLD, "The argument %s will be dealt with by PETSc/SLEPc if they understand it. Otherwise it will be silently ignored.\n", arg.c_str());
     }
   }
 
   // Begin options validation. 
   if (opts.infile.empty())
   {
-    std::cerr << "Missing Laplacian file." << std::endl;
+    PetscPrintf(PETSC_COMM_WORLD, "Missing Laplacian file.\n");
     print_usage(invocation);
     return 1;
   }
    
   if (opts.outfile_vecs.empty())
   {
-    std::cerr << "Missing output eigenvectors file." << std::endl;
+    PetscPrintf(PETSC_COMM_WORLD, "Missing output eigenvectors file.\n");
     print_usage(invocation);
     return 1;
   }
   if (opts.outfile_vals.empty())
   {
-    std::cerr << "Missing output eigenvalues file." << std::endl;
+    PetscPrintf(PETSC_COMM_WORLD, "Missing output eigenvalues file.\n");
     print_usage(invocation);
     return 1;
   }
-- 
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