add wxCmdLineParser::AddUsageText() and wxCMD_LINE_USAGE_TEXT (modified patch 1957542)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@53567 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/changes.txt

@@ -248,6 +248,7 @@ All:
   wxQueueEvent() replacing wxPostEvent().
 - wxString now uses std::[w]string internally by default, meaning that it is
   now thread-safe if the standard library provided with your compiler is.
+- Added wxCmdLineParser::AddUsageText() (Marcin 'Malcom' Malich)
 
 All (Unix):
 

include/wx/cmdline.h

@@ -55,6 +55,7 @@ enum wxCmdLineEntryType
     wxCMD_LINE_SWITCH,
     wxCMD_LINE_OPTION,
     wxCMD_LINE_PARAM,
+    wxCMD_LINE_USAGE_TEXT,
     wxCMD_LINE_NONE         // to terminate the list
 };
 
@@ -178,6 +179,9 @@ public:
                   wxCmdLineParamType type = wxCMD_LINE_VAL_STRING,
                   int flags = 0);
 
+    // add an explanatory text to be shown to the user in help
+    void AddUsageText(const wxString& text);
+
     // actions
     // -------
 
@@ -253,4 +257,3 @@ public:
 #endif // wxUSE_CMDLINE_PARSER/!wxUSE_CMDLINE_PARSER
 
 #endif // _WX_CMDLINE_H_
-

interface/cmdline.h

@@ -55,6 +55,7 @@ enum wxCmdLineEntryType
     wxCMD_LINE_SWITCH,
     wxCMD_LINE_OPTION,
     wxCMD_LINE_PARAM,
+    wxCMD_LINE_USAGE_TEXT,
     wxCMD_LINE_NONE     ///< Use this to terminate the list.
 };
 
@@ -117,6 +118,7 @@ struct wxCmdLineEntryDesc
                  unlike a switch. For example, @c -o: @c filename might be an
                  option for specifying the name of the output file.
     - @b parameter: This is a required program argument.
+    - @b text: This is a text which can be shown in usage information.
 
 
     @section cmdlineparser_construction Construction
@@ -137,8 +139,8 @@ struct wxCmdLineEntryDesc
 
     The same holds for command line description: it can be specified either in
     the constructor (with or without the command line itself) or constructed
-    later using either SetDesc() or combination of AddSwitch(), AddOption() and
+    later using either SetDesc() or combination of AddSwitch(), AddOption(),
-    AddParam() methods.
+    AddParam() and AddUsageText() methods.
 
     Using constructors or SetDesc() uses a (usually const static) table
     containing the command line description. If you want to decide which
@@ -285,6 +287,13 @@ public:
                    const wxString& desc = wxEmptyString,
                    int flags = 0);
 
+    /**
+        Add a string @a text to the command line description shown by Usage().
+
+        @since 2.9.0
+    */
+    void AddUsageText(const wxString& text);
+
     /**
         Returns @true if long options are enabled, otherwise @false.
 

src/common/cmdline.cpp

@@ -73,8 +73,15 @@ struct wxCmdLineOption
                     wxCmdLineParamType typ,
                     int fl)
     {
-        wxASSERT_MSG( !shrt.empty() || !lng.empty(),
+        // wxCMD_LINE_USAGE_TEXT uses only description, shortName and longName is empty
-                      _T("option should have at least one name") );
+    #ifdef __WXDEBUG__
+        if ( k != wxCMD_LINE_USAGE_TEXT )
+        {
+            wxASSERT_MSG
+            (
+                !shrt.empty() || !lng.empty(),
+                 wxT("option should have at least one name")
+            );
 
             wxASSERT_MSG
             (
@@ -87,6 +94,8 @@ struct wxCmdLineOption
                 GetLongOptionName(lng.begin(), lng.end()).Len() == lng.Len(),
                 wxT("Long option contains invalid characters")
             );
+        }
+    #endif // __WXDEBUG__
 
 
         kind = k;
@@ -390,6 +399,10 @@ void wxCmdLineParser::SetDesc(const wxCmdLineEntryDesc *desc)
                          desc->type, desc->flags);
                 break;
 
+            case wxCMD_LINE_USAGE_TEXT:
+                AddUsageText(wxGetTranslation(desc->description));
+                break;
+
             default:
                 wxFAIL_MSG( _T("unknown command line entry type") );
                 // still fall through
@@ -458,6 +471,17 @@ void wxCmdLineParser::AddParam(const wxString& desc,
     m_data->m_paramDesc.Add(param);
 }
 
+void wxCmdLineParser::AddUsageText(const wxString& text)
+{
+    wxASSERT_MSG( !text.empty(), wxT("text can't be empty") );
+
+    wxCmdLineOption *option = new wxCmdLineOption(wxCMD_LINE_USAGE_TEXT,
+                                                  wxEmptyString, wxEmptyString,
+                                                  text, wxCMD_LINE_VAL_NONE, 0);
+
+    m_data->m_options.Add(option);
+}
+
 // ----------------------------------------------------------------------------
 // access to parse command line
 // ----------------------------------------------------------------------------
@@ -1036,7 +1060,10 @@ wxString wxCmdLineParser::GetUsageString() const
     for ( n = 0; n < count; n++ )
     {
         wxCmdLineOption& opt = m_data->m_options[n];
+        wxString option;
 
+        if ( opt.kind != wxCMD_LINE_USAGE_TEXT )
+        {
             usage << _T(' ');
             if ( !(opt.flags & wxCMD_LINE_OPTION_MANDATORY) )
             {
@@ -1064,8 +1091,6 @@ wxString wxCmdLineParser::GetUsageString() const
                 }
             }
 
-        wxString option;
-
             if ( !opt.shortName.empty() )
             {
                 option << _T("  ") << chSwitch << opt.shortName;
@@ -1089,6 +1114,7 @@ wxString wxCmdLineParser::GetUsageString() const
             {
                 usage << _T(']');
             }
+        }
 
         namesOptions.push_back(option);
         descOptions.push_back(opt.description);
@@ -1144,11 +1170,19 @@ wxString wxCmdLineParser::GetUsageString() const
             usage << _T('\n') << stdDesc;
 
         len = namesOptions[n].length();
+        // desc contains text if name is empty
+        if (len == 0)
+        {
+            usage << descOptions[n] << _T('\n');
+        }
+        else
+        {
             usage << namesOptions[n]
                   << wxString(_T(' '), lenMax - len) << _T('\t')
                   << descOptions[n]
                   << _T('\n');
         }
+    }
 
     return usage;
 }

tests/cmdline/cmdlinetest.cpp

@@ -34,9 +34,11 @@ public:
 private:
     CPPUNIT_TEST_SUITE( CmdLineTestCase );
         CPPUNIT_TEST( ConvertStringTestCase );
+        CPPUNIT_TEST( Usage );
     CPPUNIT_TEST_SUITE_END();
 
     void ConvertStringTestCase();
+    void Usage();
 
     DECLARE_NO_COPY_CLASS(CmdLineTestCase)
 };
@@ -80,3 +82,52 @@ void CmdLineTestCase::ConvertStringTestCase()
 
     #undef WX_ASSERT_ARGS_EQUAL
 }
+
+void CmdLineTestCase::Usage()
+{
+    // check that Usage() returns roughly what we expect (don't check all the
+    // details, its format can change in the future)
+    static const wxCmdLineEntryDesc desc[] =
+    {
+        { wxCMD_LINE_USAGE_TEXT, NULL, NULL, "Verbosity options" },
+        { wxCMD_LINE_SWITCH, "v", "verbose", "be verbose" },
+        { wxCMD_LINE_SWITCH, "q", "quiet",   "be quiet" },
+
+        { wxCMD_LINE_USAGE_TEXT, NULL, NULL, "Output options" },
+        { wxCMD_LINE_OPTION, "o", "output",  "output file" },
+        { wxCMD_LINE_OPTION, "s", "size",    "output block size", wxCMD_LINE_VAL_NUMBER },
+        { wxCMD_LINE_OPTION, "d", "date",    "output file date", wxCMD_LINE_VAL_DATE },
+        { wxCMD_LINE_OPTION, "f", "double",  "output double", wxCMD_LINE_VAL_DOUBLE },
+
+        { wxCMD_LINE_PARAM,  NULL, NULL, "input file", },
+
+        { wxCMD_LINE_USAGE_TEXT, NULL, NULL, "\nEven more usage text" },
+        { wxCMD_LINE_NONE }
+    };
+
+    wxCmdLineParser p(desc);
+    const wxArrayString usageLines = wxSplit(p.GetUsageString(), '\n');
+
+    enum
+    {
+        Line_Synopsis,
+        Line_Text_Verbosity,
+        Line_Verbose,
+        Line_Quiet,
+        Line_Text_Output,
+        Line_Output_File,
+        Line_Output_Size,
+        Line_Output_Date,
+        Line_Output_Double,
+        Line_Text_Dummy1,
+        Line_Text_Dummy2,
+        Line_Last,
+        Line_Max
+    };
+
+    WX_ASSERT_SIZET_EQUAL( Line_Max, usageLines.size() );
+    WX_ASSERT_STR_EQUAL("Verbosity options", usageLines[Line_Text_Verbosity]);
+    WX_ASSERT_STR_EQUAL("", usageLines[Line_Text_Dummy1]);
+    WX_ASSERT_STR_EQUAL("Even more usage text", usageLines[Line_Text_Dummy2]);
+    WX_ASSERT_STR_EQUAL("", usageLines[Line_Last]);
+}