Revert "Revert sending extra newline (PR #81 as first fix for #18)"

This reverts commit dfd453a.

src/manimShell.ts

@@ -19,6 +19,15 @@ const IPYTHON_CELL_START_REGEX = /^\s*In \[\d+\]:/gm;
  */
 const LOG_INFO_MESSAGE_REGEX = /^\s*\[.*\] INFO/m;
 
+/**
+ * Regular expression to match IPython multiline input "...:"
+ * Sometimes IPython does not execute code when entering a newline, but enters a
+ * multiline input mode, where it expects another line of code. We detect that
+ * this happens and send an extra newline to run the code
+ * See: https://github.com/Manim-Notebook/manim-notebook/issues/18
+ */
+const IPYTHON_MULTILINE_START_REGEX = /^\s*\.{3}:\s+$/m;
+
 /**
  * Regular expression to match a KeyboardInterrupt.
  */
@@ -568,8 +577,9 @@ export class ManimShell {
    *
    * @param shell The shell to execute the command in.
    * @param command The command to execute in the shell.
+   * @param useShellIntegration Whether to use shell integration if available
    */
-  private exec(shell: Terminal, command: string) {
+  private exec(shell: Terminal, command: string, useShellIntegration = true) {
     if (!shell) {
       Window.showErrorMessage("No shell to execute command in. Internal extension error.");
       return;
@@ -578,7 +588,7 @@ export class ManimShell {
     this.detectShellExecutionEnd = false;
     Logger.debug("🔒 Shell execution end detection disabled");
 
-    if (shell.shellIntegration) {
+    if (useShellIntegration && shell.shellIntegration) {
       Logger.debug(`💨 Sending command to terminal (with shell integration): ${command}`);
       shell.shellIntegration.executeCommand(command);
     } else {
@@ -765,6 +775,14 @@ export class ManimShell {
             }
           }
 
+          if (this.isExecutingCommand && data.match(IPYTHON_MULTILINE_START_REGEX)) {
+            Logger.debug("💨 IPython multiline detected, sending extra newline");
+            // do not use shell integration here, as it might send a CTRL-C
+            // while the prompt is not finished yet
+            // \x7F deletes the extra line ("...:") from IPython
+            this.exec(this.activeShell, "\x7F", false);
+          }
+
           if (data.match(ERROR_REGEX)) {
             Logger.debug("🚨 Error in IPython cell detected");
             this.activeShell?.show();