utils: added optimin corpus minimizer

utils/optimin/src/ProgressBar.h

@@ -0,0 +1,58 @@
+/**
+ *  Progress bar.
+ *
+ *  Adapted from https://www.bfilipek.com/2020/02/inidicators.html
+ */
+
+#pragma once
+
+#include <llvm/ADT/StringRef.h>
+#include <llvm/Support/raw_ostream.h>
+
+/// Display a progress bar in the terminal
+class ProgressBar {
+ private:
+  const size_t      BarWidth;
+  const std::string Fill;
+  const std::string Remainder;
+
+ public:
+  ProgressBar() : ProgressBar(60, "#", " ") {
+  }
+
+  ProgressBar(size_t Width, const llvm::StringRef F, const llvm::StringRef R)
+      : BarWidth(Width), Fill(F), Remainder(R) {
+  }
+
+  void update(float Progress, const llvm::StringRef Status = "",
+              llvm::raw_ostream &OS = llvm::outs()) {
+    // No need to write once progress is 100%
+    if (Progress > 100.0f) return;
+
+    // Move cursor to the first position on the same line and flush
+    OS << '\r';
+    OS.flush();
+
+    // Start bar
+    OS << '[';
+
+    const auto Completed =
+        static_cast<size_t>(Progress * static_cast<float>(BarWidth) / 100.0);
+    for (size_t I = 0; I < BarWidth; ++I) {
+      if (I <= Completed) {
+        OS << Fill;
+      } else {
+        OS << Remainder;
+      }
+    }
+
+    // End bar
+    OS << ']';
+
+    // Write progress percentage
+    OS << ' ' << std::min(static_cast<size_t>(Progress), size_t(100)) << '%';
+
+    // Write status text
+    OS << "  " << Status;
+  }
+};