code simplification / deduplication

* parse the string only once for a bunch of chars to check instead of
  starting over again and again from the beginning, created a helper
  function to do this (FbTk::StringUtil::findCharFromAlphabetAfterTrigger)

* put same code into a function (setClockModeLabel())

* use much simpler code to switch between 12h and 24h mode and replace
  the fmt-switches

3 files changed, 64 insertions, 54 deletions

diff --git a/src/ClockTool.cc b/src/ClockTool.cc
index 91fea93..c2d029f 100644
--- a/src/ClockTool.cc
+++ b/src/ClockTool.cc
@@ -50,6 +50,11 @@
 
 namespace {
 
+static const char SWITCHES_SECONDS[] = "crsSTX+";
+static const char SWITCHES_12_24H[] = "lIrkHT";
+static const char SWITCHES_24_12H[] = "kHTlIr";
+static const char SWITCH_AM_PM[] = "pP";
+
 /**
  * return true if clock shows seconds. If clock doesn't show seconds then
  * there is no need to wake up every second to redraw the clock.
@@ -57,15 +62,11 @@ namespace {
 
 int showSeconds(const std::string& fmt_string) {
 
-    return fmt_string.find("%c") != std::string::npos
-        || fmt_string.find("%r") != std::string::npos
-        || fmt_string.find("%s") != std::string::npos
-        || fmt_string.find("%S") != std::string::npos
-        || fmt_string.find("%T") != std::string::npos
-        || fmt_string.find("%X") != std::string::npos
-        || fmt_string.find("%+") != std::string::npos;
+    return FbTk::StringUtil::findCharFromAlphabetAfterTrigger(
+        fmt_string, '%', SWITCHES_SECONDS, sizeof(SWITCHES_SECONDS), 0) != std::string::npos;
 }
 
+
 timeval calcNextTimeout(const std::string& fmt_string) {
     timeval now;
     timeval next;
@@ -93,69 +94,48 @@ class ClockMenuItem: public FbTk::MenuItem {
 public:
     explicit ClockMenuItem(ClockTool &tool):
         FbTk::MenuItem(""), m_tool(tool) {
-        // determine 12/24 hour format
-        _FB_USES_NLS;
-        if (m_tool.timeFormat().find("%k") != std::string::npos ||
-            m_tool.timeFormat().find("%H") != std::string::npos ||
-            m_tool.timeFormat().find("%T") != std::string::npos)
-            setLabel( _FB_XTEXT(Toolbar, Clock24,   "Clock: 24h",   "set Clockmode to 24h") );
-        else
-            setLabel( _FB_XTEXT(Toolbar, Clock12,   "Clock: 12h",   "set Clockmode to 12h") );
+
+        setClockModeLabel();
         setCloseOnClick(false);
     }
 
     void click(int button, int time, unsigned int mods) {
-        std::string newformat = m_tool.timeFormat();
-        size_t pos = newformat.find("%k");
-        std::string newstr;
-        bool clock24hour = true;
-
-        _FB_USES_NLS;
 
-        if (pos != std::string::npos)
-            newstr = "%l";
-        else if ((pos = newformat.find("%H")) != std::string::npos)
-            newstr = "%I";
-        else if ((pos = newformat.find("%T")) != std::string::npos)
-            newstr = "%r";
-
-        // 12 hour
-        if (newstr.empty()) {
-            clock24hour = false;
-            if ((pos = newformat.find("%l")) != std::string::npos)
-                newstr = "%k";
-            else if ((pos = newformat.find("%I")) != std::string::npos)
-                newstr = "%H";
-            else if ((pos = newformat.find("%r")) != std::string::npos)
-                newstr = "%T";
-
-        }
+        // does the current format string contain something with 24/12h?
+        size_t found;
+        size_t pos = FbTk::StringUtil::findCharFromAlphabetAfterTrigger(
+                m_tool.timeFormat(), '%', SWITCHES_24_12H, sizeof(SWITCHES_24_12H), &found);
 
-        if (!newstr.empty()) {
+        if (pos != std::string::npos) { // if so, exchange it with 12/24h
+            std::string newformat = m_tool.timeFormat();
+            newformat[pos+1] = SWITCHES_12_24H[found];
 
-            newformat.replace(pos, 2, newstr);
-            if (!clock24hour) { // erase %P/%p (AM|PM / am|pm)
-                pos = newformat.find("%p");
-                if (pos != std::string::npos)
-                    newformat.erase(pos, 2);
-                else if ((pos = newformat.find("%P")) != std::string::npos)
+            if (found < 3) { // 24h? erase %P/%p (AM|PM / am|pm)
+                pos = FbTk::StringUtil::findCharFromAlphabetAfterTrigger(
+                    newformat, '%', SWITCH_AM_PM, sizeof(SWITCH_AM_PM), 0);
+                if (pos != std::string::npos) {
                     newformat.erase(pos, 2);
+                }
             }
 
-
             m_tool.setTimeFormat(newformat);
-
-            if (m_tool.timeFormat().find("%k") != std::string::npos ||
-                m_tool.timeFormat().find("%H") != std::string::npos ||
-                m_tool.timeFormat().find("%T") != std::string::npos)
-                setLabel( _FB_XTEXT(Toolbar, Clock24,   "Clock: 24h",   "set Clockmode to 24h") );
-            else
-                setLabel( _FB_XTEXT(Toolbar, Clock12,   "Clock: 12h",   "set Clockmode to 12h") );
+            setClockModeLabel();
 
         } // else some other strange format...so we don't do anything
         FbTk::MenuItem::click(button, time, mods);
     }
 private:
+
+    void setClockModeLabel() {
+        _FB_USES_NLS;
+        if (FbTk::StringUtil::findCharFromAlphabetAfterTrigger(
+            m_tool.timeFormat(), '%', SWITCHES_24_12H, 3, 0) != std::string::npos) {
+            setLabel( _FB_XTEXT(Toolbar, Clock24,   "Clock: 24h",   "set Clockmode to 24h") );
+        } else {
+            setLabel( _FB_XTEXT(Toolbar, Clock12,   "Clock: 12h",   "set Clockmode to 12h") );
+        }
+    }
+
     ClockTool &m_tool;
 };
 
diff --git a/src/FbTk/StringUtil.cc b/src/FbTk/StringUtil.cc
index 602211e..4678f03 100644
--- a/src/FbTk/StringUtil.cc
+++ b/src/FbTk/StringUtil.cc
@@ -164,6 +164,24 @@ string findExtension(const string &filename) {
     return filename.substr(start_pos + 1);
 }
 
+string::size_type findCharFromAlphabetAfterTrigger(const std::string& in, char trigger, const char alphabet[], size_t len_alphabet, size_t* found) {
+    for (const char* s = in.c_str(); *s != '\0'; ) {
+        if (*s++ == trigger && *s != '\0') {
+            for (const char* a = alphabet; (a - alphabet) < len_alphabet; ++a) {
+                if (*s == *a) {
+                    if (found) {
+                        *found = a - alphabet;
+                    }
+                    return s - in.c_str() - 1;
+                }
+            }
+            s++;
+        }
+    }
+    return string::npos;
+}
+
+
 string replaceString(const string &original,
                      const char *findthis,
                      const char *replace) {
diff --git a/src/FbTk/StringUtil.hh b/src/FbTk/StringUtil.hh
index 7bc8f80..a16e709 100644
--- a/src/FbTk/StringUtil.hh
+++ b/src/FbTk/StringUtil.hh
@@ -50,6 +50,18 @@ std::string expandFilename(const std::string &filename);
 /// @return extension of filename (ex: filename.txt will return txt)
 std::string findExtension(const std::string &filename);
 
+/// is the char after a 'trigger' part of an alphabet?
+/// @param in - string to analyze
+/// @param trigger - check for char after trigger
+/// @param alphabet - contains chars to search for
+/// @param len_alphabet - length of alphabet
+/// @param found - position of found char in alphabet (optional)
+/// @return position of trigger if found
+/// @return std::string::npos if nothing found
+std::string::size_type findCharFromAlphabetAfterTrigger(const std::string& in, 
+    char trigger,
+    const char alphabet[], size_t len_alphabet, size_t* found);
+
 /// @return copy of original with find_string replaced with "replace"
 std::string replaceString(const std::string &original, 
                           const char *find_string,