Bugfix for lp format http://code.google.com/p/pulp-or/issues/detail?id=41

VERSION

@@ -1 +1 @@
-1.5.1
+1.5.2

src/pulp/pulp.py

@@ -680,7 +680,7 @@ class LpAffineExpression(_DICT_TYPE):
                     term = " + %s" % self.constant
         if self._count_characters(line) + len(term) > LpCplexLPLineSize:
             result += ["".join(line)]
-            line = [term]
+            line += [term]
         else:
             line += [term]
         result += ["".join(line)]
@@ -859,7 +859,7 @@ class LpConstraint(LpAffineExpression):
             c = 0 # Supress sign
         term = " %s %.12g" % (LpConstraintSenses[self.sense], c)
         if self._count_characters(line)+len(term) > LpCplexLPLineSize:
-            line = "".join(line)
+            result += ["".join(line)]
             line = [term]
         else:
             line += [term]

src/pulp/solvers.py

@@ -1222,9 +1222,9 @@ class COIN_CMD(LpSolver_CMD):
         aCopy.strong = self.strong
         return aCopy
 
-    def actualSolve(self, lp):
+    def actualSolve(self, lp, **kwargs):
         """Solve a well formulated lp problem"""
-        return self.solve_CBC(lp)
+        return self.solve_CBC(lp, **kwargs)
 
     def available(self):
         """True if the solver is available"""

src/pulp/tests.py

@@ -8,10 +8,11 @@ def pulpTestCheck(prob, solver, okstatus, sol = {},
                    duals = None,
                    slacks = None,
                    eps = 10**-3,
-                   status = None):
+                   status = None,
+                   **kwargs):
 
     if status is None:
-        status = prob.solve(solver)
+        status = prob.solve(solver, **kwargs)
     if status not in okstatus:
         prob.writeLP("debug.lp")
         prob.writeMPS("debug.mps")
@@ -215,6 +216,22 @@ def pulpTest017(solver):
     print "\t Testing LpVariable (not LpAffineExpression) objective"
     pulpTestCheck(prob, solver, [LpStatusOptimal])
 
+def pulpTest018(solver):
+    # Long name in lp
+    prob = LpProblem("test013", LpMinimize)
+    x = LpVariable("x"*90, 0, 4)
+    y = LpVariable("y"*90, -1, 1)
+    z = LpVariable("z"*90, 0)
+    w = LpVariable("w"*90, 0)
+    prob += x + 4*y + 9*z, "obj"
+    prob += x+y <= 5, "c1"
+    prob += x+z >= 10, "c2"
+    prob += -y+z == 7, "c3"
+    prob += w >= 0, "c4"
+    if solver.__class__ in [COIN_CMD]:
+        print "\t Testing Long lines in LP"
+        pulpTestCheck(prob, solver, [LpStatusOptimal], {x:4, y:-1, z:6, w:0},
+                    use_mps=False)
 
 def pulpTest020(solver):
     # MIP
@@ -520,9 +537,11 @@ def pulpTest123(solver):
 
 
 def pulpTestSolver(solver, msg = 0):
-    tests = [pulpTest001,
-            pulpTest010, pulpTest011, pulpTest012, pulpTest013, pulpTest014, 
+    tests = [
+            pulpTest001,
+            pulpTest010, pulpTest011, pulpTest012, pulpTest013, pulpTest014,
             pulpTest015, pulpTest016, pulpTest017,
+            pulpTest018,
             pulpTest020,
             pulpTest030,
             pulpTest040,