add a proper CLI

featuring skip order (left/right) and pause (space)!
currently available on macOS and Linux only.

src/cli/cli.cpp

@@ -0,0 +1,137 @@
+/**
+ * Furnace Tracker - multi-system chiptune tracker
+ * Copyright (C) 2021-2022 tildearrow and contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "cli.h"
+#include "../ta-log.h"
+
+bool cliQuit=false;
+
+static void handleTerm(int) {
+  cliQuit=true;
+}
+
+void FurnaceCLI::bindEngine(DivEngine* eng) {
+  e=eng;
+}
+
+bool FurnaceCLI::loop() {
+  bool escape=false;
+  bool escapeSecondStage=false;
+  while (!cliQuit) {
+    unsigned char c;
+    if (read(STDIN_FILENO,&c,1)<=0) continue;
+    if (escape) {
+      if (escapeSecondStage) {
+        switch (c) {
+          case 'C': // right
+            e->setOrder(e->getOrder()+1);
+            escape=false;
+            escapeSecondStage=false;
+            break;
+          case 'D': // left
+            e->setOrder(e->getOrder()-1);
+            escape=false;
+            escapeSecondStage=false;
+            break;
+          default:
+            escape=false;
+            escapeSecondStage=false;
+            break;
+        }
+      } else {
+        switch (c) {
+          case '[': case 'O':
+            escapeSecondStage=true;
+            break;
+          default:
+            escape=false;
+            break;
+        }
+      }
+    } else {
+      switch (c) {
+        case 0x1b: // <ESC>
+          escape=true;
+          break;
+        case 'h': // left
+          e->setOrder(e->getOrder()-1);
+          break;
+        case 'l': // right
+          e->setOrder(e->getOrder()+1);
+          break;
+        case ' ':
+          if (e->isHalted()) {
+            e->resume();
+          } else {
+            e->halt();
+          }
+          break;
+      }
+    }
+  }
+  printf("\n");
+  return true;
+}
+
+bool FurnaceCLI::finish() {
+  if (tcsetattr(0,TCSAFLUSH,&termpropold)!=0) {
+    logE("could not set console attributes!");
+    logE("you may have to run `reset` on your terminal.");
+    return false;
+  }
+  return true;
+}
+
+// blatantly copied from tildearrow/tfmxplay
+bool FurnaceCLI::init() {
+#ifdef _WIN32
+  winin=GetStdHandle(STD_INPUT_HANDLE);
+  winout=GetStdHandle(STD_OUTPUT_HANDLE);
+  int termprop=0;
+  int termpropi=0;
+  GetConsoleMode(winout,(LPDWORD)&termprop);
+  GetConsoleMode(winin,(LPDWORD)&termpropi);
+  termprop|=ENABLE_VIRTUAL_TERMINAL_PROCESSING;
+  termpropi&=~ENABLE_LINE_INPUT;
+  SetConsoleMode(winout,termprop);
+  SetConsoleMode(winin,termpropi);
+#else
+  sigemptyset(&intsa.sa_mask);
+  intsa.sa_flags=0;
+  intsa.sa_handler=handleTerm;
+  sigaction(SIGINT,&intsa,NULL);
+
+  if (tcgetattr(0,&termprop)!=0) {
+    logE("could not get console attributes!");
+    return false;
+  }
+  memcpy(&termpropold,&termprop,sizeof(struct termios));
+  termprop.c_lflag&=~ECHO;
+  termprop.c_lflag&=~ICANON;
+  if (tcsetattr(0,TCSAFLUSH,&termprop)!=0) {
+    logE("could not set console attributes!");
+    return false;
+  }
+#endif
+  return true;
+}
+
+FurnaceCLI::FurnaceCLI():
+  e(NULL) {
+}