ENH: support disable libs when constructing Time from argList (#1714)

- previously relied on presence/absence of command-line options.
  Can now explicitly disable individually

- provide shorter constructors for dealing with these types of cases.
  Make construction with non-default names for "system" and "constant"
  lengthier so there is no ambiguity.

src/OpenFOAM/db/Time/Time.C

@@ -490,7 +490,9 @@ Foam::Time::Time
     const word& ctrlDictName,
     const argList& args,
     const word& systemName,
-    const word& constantName
+    const word& constantName,
+    const bool enableFunctionObjects,
+    const bool enableLibs
 )
 :
     TimePaths(args, systemName, constantName),
@@ -543,17 +545,23 @@ Foam::Time::Time
       ? !args.found("noFunctionObjects")
       : false
     )
+    {
+        if (enableFunctionObjects)
         {
             functionObjects_.on();
         }
+    }
 
     // Libraries
     //
-    // * enabled unless '-no-libs' option was used
+    // * enable by default unless '-no-libs' option was used
     if (!args.found("no-libs"))
+    {
+        if (enableLibs)
         {
             libs_.open(controlDict_, "libs");
         }
+    }
 
     // Explicitly set read flags on objectRegistry so anything constructed
     // from it reads as well (e.g. fvSolution).
@@ -716,10 +724,8 @@ Foam::autoPtr<Foam::Time> Foam::Time::New()
     return
         autoPtr<Time>::New
         (
-            ".",            // root-path
-            ".",            // case-name
-            "system",
-            "constant",
+            fileName("."),  // root-path
+            fileName("."),  // case-name
             false,          // No enableFunctionObjects
             false           // No enableLibs
         );
@@ -733,8 +739,19 @@ Foam::autoPtr<Foam::Time> Foam::Time::New(const fileName& caseDir)
         (
             caseDir.path(), // root-path
             caseDir.name(), // case-name
-            "system",
-            "constant",
+            false,          // No enableFunctionObjects
+            false           // No enableLibs
+        );
+}
+
+
+Foam::autoPtr<Foam::Time> Foam::Time::New(const argList& args)
+{
+    return
+        autoPtr<Time>::New
+        (
+            Time::controlDictName,
+            args,
             false,          // No enableFunctionObjects
             false           // No enableLibs
         );

src/OpenFOAM/db/Time/Time.H

@@ -62,7 +62,7 @@ SourceFiles
 namespace Foam
 {
 
-// Forward declarations
+// Forward Declarations
 class argList;
 class profilingTrigger;
 class OSstream;
@@ -221,54 +221,106 @@ private:
 
 public:
 
-    TypeName("time");
+    // Static Data Members
 
         //- The default control dictionary name (normally "controlDict")
         static word controlDictName;
 
 
+    //- Runtime type information
+    TypeName("time");
+
+
     // Constructors
 
-        //- Construct given name of dictionary to read and argument list
+        //- Construct from dictionary name to read and argument list.
+        //  Uses "system" and "constant" for its directories.
+        inline Time
+        (
+            const word& ctrlDictName,
+            const argList& args,
+            const bool enableFunctionObjects = true,
+            const bool enableLibs = true
+        );
+
+        //- Construct given name of dictionary to read and root/case paths.
+        //  Uses "system" and "constant" for its directories.
+        inline Time
+        (
+            const word& ctrlDictName,
+            const fileName& rootPath,
+            const fileName& caseName,
+            const bool enableFunctionObjects = true,
+            const bool enableLibs = true
+        );
+
+        //- Construct given dictionary and root/case paths.
+        //  Uses "system" and "constant" for its directories.
+        inline Time
+        (
+            const dictionary& dict,
+            const fileName& rootPath,
+            const fileName& caseName,
+            const bool enableFunctionObjects = true,
+            const bool enableLibs = true
+        );
+
+        //- Construct at endTime and root/case paths.
+        //  Uses "system" and "constant" for its directories.
+        inline Time
+        (
+            const fileName& rootPath,
+            const fileName& caseName,
+            const bool enableFunctionObjects = true,
+            const bool enableLibs = true
+        );
+
+        //- Construct from dictionary name to read and argument list.
+        //  Use specified system/constant directory names.
         Time
         (
             const word& ctrlDictName,
             const argList& args,
-            const word& systemName = "system",
-            const word& constantName = "constant"
+            const word& systemName,     //!< "system" directory name
+            const word& constantName,   //!< "constant" directory name
+            const bool enableFunctionObjects = true,
+            const bool enableLibs = true
         );
 
-        //- Construct given name of dictionary to read, rootPath and casePath
+        //- Construct given name of dictionary to read and root/case paths.
+        //  Use specified system/constant directory names.
         Time
         (
             const word& ctrlDictName,
             const fileName& rootPath,
             const fileName& caseName,
-            const word& systemName = "system",
-            const word& constantName = "constant",
+            const word& systemName,     //!< "system" directory name
+            const word& constantName,   //!< "constant" directory name
             const bool enableFunctionObjects = true,
             const bool enableLibs = true
         );
 
-        //- Construct given dictionary, rootPath and casePath
+        //- Construct given dictionary and root/case paths.
+        //  Use specified system/constant directory names.
         Time
         (
             const dictionary& dict,
             const fileName& rootPath,
             const fileName& caseName,
-            const word& systemName = "system",
-            const word& constantName = "constant",
+            const word& systemName,     //!< "system" directory name
+            const word& constantName,   //!< "constant" directory name
             const bool enableFunctionObjects = true,
             const bool enableLibs = true
         );
 
-        //- Construct given endTime, rootPath and casePath
+        //- Construct given endTime and root/case paths.
+        //  Use specified system/constant directory names.
         Time
         (
             const fileName& rootPath,
             const fileName& caseName,
-            const word& systemName = "system",
-            const word& constantName = "constant",
+            const word& systemName,     //!< "system" directory name
+            const word& constantName,   //!< "constant" directory name
             const bool enableFunctionObjects = true,
             const bool enableLibs = true
         );
@@ -276,12 +328,15 @@ public:
 
     // Selectors
 
-        //- Construct dummy time, without functionObjects or libraries
+        //- Construct (dummy) Time - no functionObjects or libraries
         static autoPtr<Time> New();
 
-        //- Construct dummy time, without functionObjects or libraries
+        //- Construct (dummy) Time - no functionObjects or libraries
         static autoPtr<Time> New(const fileName& caseDir);
 
+        //- Construct (dummy) Time - no functionObjects or libraries
+        static autoPtr<Time> New(const argList& args);
+
 
     //- Destructor
     virtual ~Time();
@@ -608,6 +663,10 @@ public:
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
+#include "TimeI.H"
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
 #endif
 
 // ************************************************************************* //

src/OpenFOAM/db/Time/TimeI.H

@@ -0,0 +1,114 @@
+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | www.openfoam.com
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+    Copyright (C) 2020 OpenCFD Ltd.
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+\*---------------------------------------------------------------------------*/
+
+// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
+
+inline Foam::Time::Time
+(
+    const word& ctrlDictName,
+    const argList& args,
+    const bool enableFunctionObjects,
+    const bool enableLibs
+)
+:
+    Foam::Time
+    (
+        ctrlDictName,
+        args,
+        "system",
+        "constant",
+        enableFunctionObjects,
+        enableLibs
+    )
+{}
+
+
+inline Foam::Time::Time
+(
+    const word& ctrlDictName,
+    const fileName& rootPath,
+    const fileName& caseName,
+    const bool enableFunctionObjects,
+    const bool enableLibs
+)
+:
+    Foam::Time
+    (
+        ctrlDictName,
+        rootPath,
+        caseName,
+        "system",
+        "constant",
+        enableFunctionObjects,
+        enableLibs
+)
+{}
+
+
+inline Foam::Time::Time
+(
+    const dictionary& dict,
+    const fileName& rootPath,
+    const fileName& caseName,
+    const bool enableFunctionObjects,
+    const bool enableLibs
+)
+:
+    Foam::Time
+    (
+        dict,
+        rootPath,
+        caseName,
+        "system",
+        "constant",
+        enableFunctionObjects,
+        enableLibs
+    )
+{}
+
+
+inline Foam::Time::Time
+(
+    const fileName& rootPath,
+    const fileName& caseName,
+    const bool enableFunctionObjects,
+    const bool enableLibs
+)
+:
+    Time
+    (
+        rootPath,
+        caseName,
+        "system",
+        "constant",
+        enableFunctionObjects,
+        enableLibs
+    )
+{}
+
+
+// ************************************************************************* //

src/OpenFOAM/db/Time/TimePaths.H

@@ -46,7 +46,7 @@ SourceFiles
 namespace Foam
 {
 
-// Forward declarations
+// Forward Declarations
 class argList;
 
 /*---------------------------------------------------------------------------*\
@@ -56,7 +56,7 @@ class argList;
 
 class TimePaths
 {
-    // Private data
+    // Private Data
 
         bool processorCase_;
         bool distributed_;
@@ -79,7 +79,7 @@ public:
     // Constructors
 
         //- Construct using characteristics given by the argList
-        TimePaths
+        explicit TimePaths
         (
             const argList& args,
             const word& systemName = "system",