don't print source automatically; has to be required instead

remix-debug/src/cmdline/index.js

 var Web3 = require('web3')
 var Debugger = require('../debugger/debugger.js')
 var ContextManager = require('./contextManager.js')
+var EventManager = require('events')
 
 class CmdLine {
 
   constructor () {
+    this.events = new EventManager()
+    this.lineColumnPos = null
   }
 
   connect (providerType, url) {
@@ -36,35 +39,53 @@ class CmdLine {
     this.contextManager.switchProvider('debugger_web3')
   }
 
+  getSource() {
+    const self = this
+
+    console.dir("getSource")
+    console.dir(this.lineColumnPos)
+    console.dir(this.filename)
+
+    let lineColumnPos = this.lineColumnPos
+
+    if (!lineColumnPos || !lineColumnPos.start) return;
+
+    let content = self.compilation.lastCompilationResult.source.sources[this.filename].content.split("\n")
+
+    let source = []
+
+    let line
+    line = content[lineColumnPos.start.line - 2]
+    if ( line !== undefined) {
+      source.push("    " + (lineColumnPos.start.line - 1) + ":  " + line)
+    }
+    line = content[lineColumnPos.start.line - 1]
+    if ( line !== undefined) {
+      source.push("    " + lineColumnPos.start.line + ":  " + line)
+    }
+
+    let currentLineNumber = lineColumnPos.start.line
+    let currentLine = content[currentLineNumber]
+    source.push("=>  " + (currentLineNumber + 1) + ":  " + currentLine)
+
+    let startLine = lineColumnPos.start.line
+    for (var i=1; i < 4; i++) {
+      let line = content[startLine + i]
+      source.push("    " + (startLine + i + 1) + ":  " + line)
+    }
+
+    return source
+  }
+
   // TODO: is filename really necessary?
   startDebug(txNumber, filename) {
     const self = this
+    this.filename = filename
     this.debugger.debug(null, txNumber, null, () => {
 
-      self.debugger.event.register('newSourceLocation', function (lineColumnPos, rawLocation) {
-        if (!lineColumnPos || !lineColumnPos.start) return;
-
-        let content = self.compilation.lastCompilationResult.source.sources[filename].content.split("\n")
-
-        let line
-        line = content[lineColumnPos.start.line - 2]
-        if ( line !== undefined) {
-          console.dir("    " + (lineColumnPos.start.line - 1) + ":  " + line)
-        }
-        line = content[lineColumnPos.start.line - 1]
-        if ( line !== undefined) {
-          console.dir("    " + lineColumnPos.start.line + ":  " + line)
-        }
-
-        let currentLineNumber = lineColumnPos.start.line
-        let currentLine = content[currentLineNumber]
-        console.dir("=>  " + (currentLineNumber + 1) + ":  " + currentLine)
-
-        let startLine = lineColumnPos.start.line
-        for (var i=1; i < 4; i++) {
-          let line = content[startLine + i]
-          console.dir("    " + (startLine + i + 1) + ":  " + line)
-        }
+      self.debugger.event.register('newSourceLocation', function (lineColumnPos, _rawLocation) {
+        self.lineColumnPos = lineColumnPos
+        self.events.emit("source")
       });
 
       self.debugger.vmDebuggerLogic.event.register('solidityState', (data) => {

remix-debug/src/debugger/solidityState.js

@@ -36,7 +36,12 @@ class DebuggerSolidityState {
     }
     self.event.trigger('solidityStateUpdating')
     decodeTimeout = setTimeout(function () {
-      self.decode(index)
+      // necessary due to some states that can crash the debugger
+      try {
+        self.decode(index)
+      } catch(err) {
+      }
+
     }, 500)
   }