include <cmath> in src/changes.C for std::abs(double)

[lyx.git] / src / changes.C

diff --git a/src/changes.C b/src/changes.C
index 0a708c64bbc8c4c474d910f092470467de2a7bea..53d89e494e70c7e5d3256d8e483ef388a67b646d 100644 (file)
--- a/src/changes.C
+++ b/src/changes.C
@@ -16,19 +16,42 @@
 #include "changes.h"
 #include "debug.h"
 
+#include <cmath>
 #include <boost/assert.hpp>
 
 
 namespace lyx {
 
+using std::abs;
 using std::endl;
 using std::string;
-
+using std::max;
+
+/*
+ * Class Change has a changetime field that specifies the exact time at which
+ * a specific change was made. The change time is used as a guidance for the
+ * user while editing his document. Presently, it is not considered for LaTeX
+ * export. To avoid that every keystroke results in a separate change, a 
+ * tolerance interval of 5 minutes is used. That means if there are two adjacent
+ * changes that only differ in their change time with abs(ct1 - ct2) < 300 sec,
+ * they will be merged (and the later change time is preserved).
+ * Technically, the check for equality (or similarity) is made in operator==(...).
+ * The merging of similar changes happens in method merge().
+ */
 
 bool operator==(Change const & l, Change const & r)
 {
-       return l.type == r.type && l.author == r.author
-               && l.changetime == r.changetime;
+       if (l.type != r.type) {
+               return false;
+       }
+
+       if (l.type == Change::UNCHANGED) {
+               return true;
+       }
+
+       return l.author == r.author
+              // both changes made within 5 minutes?
+              && abs(difftime(l.changetime, r.changetime)) < 300;
 }
 
 
@@ -87,11 +110,6 @@ void Changes::set(Change const & change, pos_type const start, pos_type const en
        ChangeTable::iterator it = table_.begin();
 
        for (; it != table_.end(); ) {
-               // find super change, check for equal types, and do nothing
-               if (it->range.contains(newRange) && it->change.type == change.type) {
-                       return; 
-               }
-
                // current change starts like or follows new change
                if (it->range.start >= start) {
                        break;
@@ -282,6 +300,8 @@ void Changes::merge()
                                        << (it + 1)->range.end << ")" << endl;
                        }
                        (it + 1)->range.start = it->range.start;
+                       (it + 1)->change.changetime = max(it->change.changetime,
+                                                         (it + 1)->change.changetime);
                        table_.erase(it);
                        // start again
                        it = table_.begin();
@@ -294,11 +314,10 @@ void Changes::merge()
 
 
 int Changes::latexMarkChange(odocstream & os,
-                            Change::Type const old, Change::Type const change,
+                            Change::Type const oldChangeType, Change::Type const changeType,
                             bool const & output)
 {
-       // FIXME: change tracking (MG)
-       if (!output || old == change)
+       if (!output || oldChangeType == changeType)
                return 0;
 
        static docstring const start(from_ascii("\\changestart{}"));
@@ -308,19 +327,19 @@ int Changes::latexMarkChange(odocstream & os,
 
        int column = 0;
 
-       if (old == Change::DELETED) {
+       if (oldChangeType == Change::DELETED) {
                os << soff;
                column += soff.length();
        }
 
-       switch (change) {
+       switch (changeType) {
                case Change::UNCHANGED:
                        os << end;
                        column += end.length();
                        break;
 
                case Change::DELETED:
-                       if (old == Change::UNCHANGED) {
+                       if (oldChangeType == Change::UNCHANGED) {
                                os << start;
                                column += start.length();
                        }
@@ -329,7 +348,7 @@ int Changes::latexMarkChange(odocstream & os,
                        break;
 
                case Change::INSERTED:
-                       if (old == Change::UNCHANGED) {
+                       if (oldChangeType == Change::UNCHANGED) {
                                os << start;
                                column += start.length();
                        }
@@ -341,10 +360,8 @@ int Changes::latexMarkChange(odocstream & os,
 
 
 void Changes::lyxMarkChange(std::ostream & os, int & column,
-                           time_type const curtime,
                            Change const & old, Change const & change)
 {
-       // FIXME: change tracking (MG)
        if (old == change)
                return;
 
@@ -356,23 +373,16 @@ void Changes::lyxMarkChange(std::ostream & os, int & column,
                        break;
 
                case Change::DELETED: {
-                       time_type t = change.changetime;
-                       if (!t)
-                               t = curtime;
                        os << "\n\\change_deleted " << change.author
-                               << " " << t << "\n";
-
+                               << " " << change.changetime << "\n";
                        break;
                }
 
-       case Change::INSERTED: {
-                       time_type t = change.changetime;
-                       if (!t)
-                               t = curtime;
+               case Change::INSERTED: {
                        os << "\n\\change_inserted " << change.author
-                               << " " << t << "\n";
+                               << " " << change.changetime << "\n";
                        break;
-       }
+               }
        }
 }