fix {depth} display, warnings and doc

- fix call stack depth display with {depth}: remove (5) stripped depths.
- fix warnings in tests
- Explain CLUTCHLOG_HAVE_UNIX_SYSINFO in the README.

README.md

@@ -345,16 +345,33 @@ Note: the log levels constants are lower case (for example: `clutchlog::level::x
 Limitations
 ===========
 
+### System-dependent stack depth
+
 Because the call stack depth and program name access are system-dependent,
 the features relying on the depth of the call stack and the display of the program name
 are only available for operating systems having the following headers:
 `execinfo.h`, `stdlib.h` and `libgen.h` (so far, tested with Linux).
 
+Clutchlog sets the `CLUTCHLOG_HAVE_UNIX_SYSINFO` to 1 if the headers are
+available, and to 0 if they are not.
+You can make portable code using something like:
+```cpp
+#if CLUTCHLOG_HAVE_UNIX_SYSINFO == 1
+    log.depth( x );
+#endif 
+```
+
+
+### Dependencies
+
 Some colors/styles may not be supported by some exotic terminal emulators.
 
 Clutchlog needs `C++-17` with the `filesystem` feature.
 You may need to indicate `-std=c++17 -lstdc++fs` to some compilers.
 
+
+### Features
+
 What Clutchlog do not provide at the moment (but may in a near future):
 
 - Super fast log writing.

clutchlog/clutchlog.h

@@ -26,6 +26,7 @@ namespace fs = std::filesystem;
 #include <execinfo.h> // execinfo
 #include <stdlib.h>   // getenv
 #include <libgen.h>   // basename
+//! POSIX headers necessary for stack depth management are available.
 #define CLUTCHLOG_HAVE_UNIX_SYSINFO 1
 #else
 #define CLUTCHLOG_HAVE_UNIX_SYSINFO 0
@@ -36,6 +37,7 @@ namespace fs = std::filesystem;
  **********************************************************************/
 #ifndef WITH_CLUTCHLOG
 #ifndef NDEBUG
+//! Actually enable clutchlog features.
 #define WITH_CLUTCHLOG
 #endif
 #endif
@@ -662,7 +664,7 @@ class clutchlog
 
 #if CLUTCHLOG_HAVE_UNIX_SYSINFO == 1
             format = replace(format, "\\{name\\}", name);
-            format = replace(format, "\\{depth\\}", depth);
+            format = replace(format, "\\{depth\\}", depth - _strip_calls);
 
             std::ostringstream chevrons;
             for(size_t i = _strip_calls; i < depth; ++i) {

tests/t-assert.cpp

@@ -0,0 +1,42 @@
+#include <iostream>
+#include <cassert>
+
+#include "../clutchlog/clutchlog.h"
+
+// Make asserts (de)clutchable.
+#define ASSERT(LEVEL, ...) { CLUTCHFUNC(LEVEL, assert, __VA_ARGS__) }
+
+void h()
+{
+    CLUTCHLOG(info, "!");
+    ASSERT(info, true == true);
+    std::clog << "--" << std::endl;
+}
+
+void g()
+{
+    CLUTCHLOG(warning, "world");
+    ASSERT(warning, strcmp("life","life") == 0);
+    h();
+}
+
+void f()
+{
+    CLUTCHLOG(error, "hello ");
+    ASSERT(error, strcmp("no more","please")!=0);
+    g();
+}
+
+int main(/*const int argc, char* argv[]*/)
+{
+    auto& log = clutchlog::logger();
+
+    log.func("f");
+    f();
+
+    log.func("g");
+    f();
+
+    log.func("h");
+    f();
+}

tests/t-demo.cpp

@@ -49,7 +49,7 @@ int main(const int argc, char* argv[])
     } else {
         try {
             log.threshold(log.level_of(argv[1]));
-        } catch(std::out_of_range err) {
+        } catch(std::out_of_range& err) {
             CLUTCHLOG(critical,err.what());
             exit(100);
         }