Enable use of external fmt

src/polysolve/Utils.cpp

@@ -1,6 +1,10 @@
 #include "Utils.hpp"
 
+#if defined(SPDLOG_FMT_EXTERNAL)
+#include <fmt/color.h>
+#else
 #include <spdlog/fmt/bundled/color.h>
+#endif
 
 namespace polysolve
 {
@@ -49,7 +53,7 @@ namespace polysolve
 
     void StopWatch::log_msg()
     {
-        const static std::string log_fmt_text =
+        const static auto log_fmt_text =
             fmt::format("[{}] {{}} {{:.3g}}s", fmt::format(fmt::fg(fmt::terminal_color::magenta), "timing"));
 
         if (!m_name.empty())
@@ -60,7 +64,7 @@ namespace polysolve
 
     void log_and_throw_error(spdlog::logger &logger, const std::string &msg)
     {
-        logger.error(msg);
+        logger.error("{}", msg);
         throw std::runtime_error(msg);
     }
 
@@ -79,4 +83,4 @@ namespace polysolve
         return json[name];
     }
 
-} // namespace polysolve
+} // namespace polysolve

src/polysolve/Utils.hpp

@@ -55,7 +55,7 @@ namespace polysolve
     template <typename... Args>
     [[noreturn]] void log_and_throw_error(spdlog::logger &logger, const std::string &msg, const Args &...args)
     {
-        log_and_throw_error(logger, fmt::format(msg, args...));
+        log_and_throw_error(logger, fmt::format(fmt::runtime(msg), args...));
     }
 
     Eigen::SparseMatrix<double> sparse_identity(int rows, int cols);

src/polysolve/nonlinear/Criteria.cpp

@@ -29,7 +29,10 @@
 
     void Criteria::print(std::ostream &os) const
     {
-        os << fmt::format(
+        os << print_message();
+    }
+    std::string Criteria::print_message() const {
+        return fmt::format(
             "iters={:d} Δf={:g} ‖∇f‖={:g} ‖Δx‖={:g} Δx⋅∇f(x)={:g}",
             iterations, fDelta, gradNorm, xDelta, xDeltaDotGrad);
     }
@@ -61,47 +64,39 @@
         return Status::Continue;
     }
 
-    std::ostream &operator<<(std::ostream &os, const Status &s)
-    {
+    std::string_view status_message(Status s) {
         switch (s)
         {
         case Status::NotStarted:
-            os << "Solver not started";
-            break;
+            return "Solver not started";
         case Status::Continue:
-            os << "Convergence criteria not reached";
-            break;
+            return "Convergence criteria not reached";
         case Status::IterationLimit:
-            os << "Iteration limit reached";
-            break;
+            return "Iteration limit reached";
         case Status::XDeltaTolerance:
-            os << "Change in parameter vector too small";
-            break;
+            return "Change in parameter vector too small";
         case Status::FDeltaTolerance:
-            os << "Change in cost function value too small";
-            break;
+            return "Change in cost function value too small";
         case Status::GradNormTolerance:
-            os << "Gradient vector norm too small";
-            break;
+            return "Gradient vector norm too small";
         case Status::ObjectiveCustomStop:
-            os << "Objective function specified to stop";
-            break;
+            return "Objective function specified to stop";
         case Status::NanEncountered:
-            os << "Objective or gradient function returned NaN";
-            break;
+            return "Objective or gradient function returned NaN";
         case Status::NotDescentDirection:
-            os << "Search direction not a descent direction";
-            break;
+            return "Search direction not a descent direction";
         case Status::LineSearchFailed:
-            os << "Line search failed";
-            break;
+            return "Line search failed";
         case Status::UpdateDirectionFailed:
-            os << "Update direction could not be computed";
-            break;
+            return "Update direction could not be computed";
         default:
-            os << "Unknown status";
-            break;
+            return "Unknown status";
         }
+    }
+
+    std::ostream &operator<<(std::ostream &os, const Status &s)
+    {
+        os << status_message(s);
         return os;
     }
 
@@ -110,4 +105,4 @@
         c.print(os);
         return os;
     }
-} // namespace polysolve::nonlinear
+} // namespace polysolve::nonlinear

src/polysolve/nonlinear/Criteria.hpp

@@ -2,6 +2,7 @@
 
 #include <cstddef>
 #include <iostream>
+#include <string_view>
 
 namespace polysolve::nonlinear
 {
@@ -43,11 +44,15 @@ namespace polysolve::nonlinear
         void reset();
 
         void print(std::ostream &os) const;
+        std::string print_message() const;
     };
 
     Status checkConvergence(const Criteria &stop, const Criteria &current);
 
+    std::string_view status_message(Status s);
+    std::string criteria_message(const Criteria& s);
+
     std::ostream &operator<<(std::ostream &os, const Status &s);
 
     std::ostream &operator<<(std::ostream &os, const Criteria &c);
-} // namespace polysolve::nonlinear
+} // namespace polysolve::nonlinear

src/polysolve/nonlinear/Solver.cpp

@@ -14,7 +14,11 @@
 #include <jse/jse.h>
 
 #include <spdlog/spdlog.h>
+#if defined(SPDLOG_FMT_EXTERNAL)
+#include <fmt/color.h>
+#else
 #include <spdlog/fmt/bundled/color.h>
+#endif
 #include <spdlog/fmt/ostr.h>
 
 #include <finitediff.hpp>
@@ -279,7 +283,7 @@
 
         m_logger.debug(
             "Starting {} with {} solve f₀={:g} (stopping criteria: {})",
-            descent_strategy_name(), m_line_search->name(), objFunc(x), m_stop);
+            descent_strategy_name(), m_line_search->name(), objFunc(x), m_stop.print_message());
 
         update_solver_info(objFunc(x));
         objFunc.post_step(PostStepData(m_current.iterations, solver_info, x, grad));
@@ -350,12 +354,12 @@
                     m_status = Status::UpdateDirectionFailed;
                     log_and_throw_error(
                         m_logger, "[{}][{}] {} on last strategy; stopping",
-                        current_name, m_line_search->name(), m_status);
+                        current_name, m_line_search->name(), status_message(m_status));
                 }
 
                 m_logger.debug(
                     "[{}][{}] {}; reverting to {}", current_name, m_line_search->name(),
-                    Status::UpdateDirectionFailed, descent_strategy_name());
+                    status_message(Status::UpdateDirectionFailed), descent_strategy_name());
                 m_status = Status::Continue;
                 continue;
             }
@@ -374,15 +378,15 @@
                     m_status = Status::NotDescentDirection;
                     log_and_throw_error(
                         m_logger, "[{}][{}] {} on last strategy (‖Δx‖={:g}; ‖g‖={:g}; Δx⋅g={:g}≥0); stopping",
-                        current_name, m_line_search->name(), m_status, delta_x.norm(), compute_grad_norm(x, grad),
+                        current_name, m_line_search->name(), status_message(m_status), delta_x.norm(), compute_grad_norm(x, grad),
                         m_current.xDeltaDotGrad);
                 }
                 else
                 {
                     m_status = Status::Continue;
                     m_logger.debug(
                         "[{}][{}] {} (‖Δx‖={:g}; ‖g‖={:g}; Δx⋅g={:g}≥0); reverting to {}",
-                        current_name, m_line_search->name(), Status::NotDescentDirection,
+                        current_name, m_line_search->name(), status_message(Status::NotDescentDirection),
                         delta_x.norm(), compute_grad_norm(x, grad), m_current.xDeltaDotGrad,
                         descent_strategy_name());
                 }
@@ -473,7 +477,7 @@
 
             m_logger.debug(
                 "[{}][{}] {} (stopping criteria: {})",
-                descent_strategy_name(), m_line_search->name(), m_current, m_stop);
+                descent_strategy_name(), m_line_search->name(), m_current.print_message(), m_stop.print_message());
 
             if (++m_current.iterations >= m_stop.iterations)
                 m_status = Status::IterationLimit;
@@ -495,8 +499,8 @@
         m_logger.log(
             succeeded ? spdlog::level::info : spdlog::level::err,
             "[{}][{}] Finished: {} took {:g}s ({}) (stopping criteria: {})",
-            descent_strategy_name(), m_line_search->name(), m_status, tot_time,
-            m_current, m_stop);
+            descent_strategy_name(), m_line_search->name(), status_message(m_status), tot_time,
+            m_current.print_message(), m_stop.print_message());
 
         log_times();
         update_solver_info(objFunc(x));

src/polysolve/nonlinear/descent_strategies/Newton.cpp

@@ -2,7 +2,11 @@
 
 #include <polysolve/Utils.hpp>
 
+#if defined(SPDLOG_FMT_EXTERNAL)
+#include <fmt/color.h>
+#else
 #include <spdlog/fmt/bundled/color.h>
+#endif
 
 namespace polysolve::nonlinear
 {

src/polysolve/nonlinear/line_search/LineSearch.cpp

@@ -9,7 +9,11 @@
 
 #include <polysolve/Types.hpp>
 
+#if defined(SPDLOG_FMT_EXTERNAL)
+#include <fmt/color.h>
+#else
 #include <spdlog/fmt/bundled/color.h>
+#endif
 
 #include <cfenv>