[libcalamares] Implement translatable-pair-of-char*

- This is base functionality for a translatable model of
   TimeZone names that is scraped from zone.tab

src/libcalamares/locale/TimeZone.cpp

@@ -0,0 +1,83 @@
+/* === This file is part of Calamares - <https://github.com/calamares> ===
+ *
+ *   Copyright 2019, Adriaan de Groot <groot@kde.org>
+ *
+ *   Calamares 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.
+ *
+ *   Calamares 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 Calamares. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "TimeZone.h"
+
+#include <cstring>
+
+namespace CalamaresUtils
+{
+namespace Locale
+{
+
+
+CStringPair::CStringPair( CStringPair&& t )
+{
+    // My pointers are initialized to nullptr
+    std::swap( m_human, t.m_human );
+    std::swap( m_key, t.m_key );
+}
+
+CStringPair::CStringPair( const CStringPair& t )
+    : m_human( t.m_human ? strdup( t.m_human ) : nullptr )
+    , m_key( t.m_key ? strdup( t.m_key ) : nullptr )
+{
+}
+
+/** @brief Massage an identifier into a human-readable form
+ *
+ * Makes a copy of @p s, caller must free() it.
+ */
+static char*
+munge( const char* s )
+{
+    char* t = strdup( s );
+    if ( !t )
+    {
+        return nullptr;
+    }
+
+    // replace("_"," ") in the Python script
+    char* p = t;
+    while ( *p )
+    {
+        if ( ( *p ) == '_' )
+        {
+            *p = ' ';
+        }
+        ++p;
+    }
+
+    return t;
+}
+
+CStringPair::CStringPair( const char* s1 )
+    : m_human( s1 ? munge( s1 ) : nullptr )
+    , m_key( s1 ? strdup( s1 ) : nullptr )
+{
+}
+
+
+CStringPair::~CStringPair()
+{
+    free( m_human );
+    free( m_key );
+}
+
+}  // namespace Locale
+}  // namespace CalamaresUtils

src/libcalamares/locale/TimeZone.h

@@ -19,6 +19,7 @@
 #ifndef LOCALE_TIMEZONE_H
 #define LOCALE_TIMEZONE_H
 
+#include <QObject>
 #include <QString>
 
 namespace CalamaresUtils
@@ -39,14 +40,20 @@ namespace Locale
 class CStringPair
 {
 public:
-    explicit CStringPair(const char *s1);
-    CStringPair(CStringPair&& t);
-    CStringPair(const CStringPair&) = delete;
-    ~CStringPair();
+    /// @brief An empty pair
+    CStringPair() {};
+    /// @brief Given an identifier, create the pair
+    explicit CStringPair( const char* s1 );
+    CStringPair( CStringPair&& t );
+    CStringPair( const CStringPair& );
+    virtual ~CStringPair();
 
-private:
-    const char* m_human = nullptr;
-    const char* m_key = nullptr;
+    /// @brief Give the localized human-readable form
+    virtual QString tr() const = 0;
+
+protected:
+    char* m_human = nullptr;
+    char* m_key = nullptr;
 };
 
 /// @brief A pair of strings for timezone regions (e.g. "America")
@@ -54,6 +61,9 @@ class TZRegion : public CStringPair
 {
 public:
     using CStringPair::CStringPair;
+
+    // NOTE: context name must match what's used in zone-extractor.py
+    QString tr() const override { return QObject::tr( m_human, "tz_regions" ); }
 };
 
 /// @brief A pair of strings for specific timezone names (e.g. "New_York")
@@ -61,9 +71,12 @@ class TZZone : public CStringPair
 {
 public:
     using CStringPair::CStringPair;
+
+    // NOTE: context name must match what's used in zone-extractor.py
+    QString tr() const override { return QObject::tr( m_human, "tz_names" ); }
 };
 
-}
-}
+}  // namespace Locale
+}  // namespace CalamaresUtils
 
 #endif  // LOCALE_TIMEZONE_H