feat(depth_marks): atomic styling of depth marks

Color each `{depth_marks}` with the corresponding `depth_styles`.
Implements #8

README.md

@@ -412,6 +412,10 @@ For example:
 log.depth_styles({ fmt(255), fmt(250), fmt(245), fmt(240), fmt(235) });
 ```
 
+If `clutchlog::depth_styles` is set, the `{depth_marks}` template tag will render
+with each mark having each own style corresponding to its depth.
+Note: a depth of zero showing no mark, the first style in the list is never applied to marks.
+
 
 Advanced Usage
 ==============

clutchlog/clutchlog.h

@@ -1288,17 +1288,25 @@ class clutchlog
             row = replace(row, "\\{name\\}", name);
             row = replace(row, "\\{depth\\}", actual_depth);
 
-            std::ostringstream chevrons;
-            for(size_t i = _strip_calls; i < depth; ++i) {
-                chevrons << _depth_mark;
-            }
-            row = replace(row, "\\{depth_marks\\}", chevrons.str());
-
             if(_depth_fmts.size() == 0) {
                 row = replace(row, "\\{depth_fmt\\}", fmt(actual_depth % 256).str() );
+
+                std::ostringstream chevrons;
+                for(size_t i = 0; i < actual_depth; ++i) {
+                    chevrons << _depth_mark;
+                }
+                row = replace(row, "\\{depth_marks\\}", chevrons.str());
+
             } else {
                 row = replace(row, "\\{depth_fmt\\}",
                     _depth_fmts[std::min(actual_depth,_depth_fmts.size()-1)].str() );
+
+                std::ostringstream chevrons;
+                for(size_t i = 0; i < actual_depth; ++i) {
+                    chevrons << _depth_fmts[std::min(i+1,_depth_fmts.size()-1)].str()
+                             << _depth_mark;
+                }
+                row = replace(row, "\\{depth_marks\\}", chevrons.str());
             }
 #endif
             row = replace(row, "\\{level_fmt\\}", _level_fmt.at(stage).str());

tests/t-demo-extravagant.cpp

@@ -83,21 +83,29 @@ int main(const int argc, char* argv[])
     log.hfill_mark('-');
 
     const short dark = 238;
-    const short lite = 250;
+    const short lite = 245;
+
+    std::vector<clutchlog::fmt> greys = {fmt(15)};
+    for(unsigned short i=255; i>231; i-=3) {
+        greys.push_back( fmt(i) );
+    }
+    log.depth_styles(greys);
 
     format
            << fmt(dark,lite) << "{name}"
-           << fmt(lite,dark) << ""
-           << fmt(fg::none,dark) << "{level_fmt}" << " {level_short} " << reset
-           << fmt(dark,bg::none) << "" << reset
-           << fmt(dark,bg::none) << "{depth_marks}" << reset
+           << fmt(fg::none,lite,typo::inverse) << "{level_fmt}"
+           << fmt(fg::none,bg::black,typo::inverse) << "{level_fmt}" << " {level_short} " << reset
+           << "{level_fmt} " << reset
+           << fmt(dark,bg::none) << "{depth_marks}" //<< reset
            << "{level_fmt}"
+           // << "{funchash_fmt}"
            << bold("{msg}")
-           << discreet(" {hfill} ")
+           // << discreet(" {hfill} ")
+           << "{depth_fmt} {hfill} "
            << fmt(dark,bg::none) << ""
-           << fmt(fg::none,dark) << "{level_fmt} {func} "
+           << fmt(fg::none,dark) << "{funchash_fmt}{func} "
            << fmt(lite,dark) << ""
-           << fmt(dark,lite) << "{file}" << reset
+           << fmt(dark,lite) << "{filehash_fmt}{file}" << reset
            << fmt(dark,lite) << ""
            << fmt(lite,dark) << "{line}" << reset
            << "\n";

tests/t-hash-color.cpp

@@ -34,7 +34,7 @@ int main(/*const int argc, char* argv[]*/)
 
     fmt reset(typo::reset);
     std::ostringstream tpl;
-    tpl << "{level_fmt}Having a {level} {filehash_fmt}within {file} {funchash_fmt}calling {func} {depth_fmt}at level {depth}"
+    tpl << "{level_fmt}Having a {level} {filehash_fmt}within {file} {funchash_fmt}calling {func} {depth_fmt}at depth {depth_marks} {depth} "
         << reset << " : {msg}\n";
     log.format(tpl.str());
     log.threshold(clutchlog::level::xdebug);