[gjs: 1/2] Add backtrace full command to debugger

[Philip Chimento <pchimento src gnome org>]

commit f99809052ea826c06c239c631b52f4e0358b8d9b
Author: Nasah Kuma <nasahnash19 gmail com>
Date:   Sat Jan 9 23:00:10 2021 +0000

    Add backtrace full command to debugger
    
    Closes: GNOME/gjs#208

 installed-tests/debugger/backtrace.debugger        |  2 ++
 installed-tests/debugger/backtrace.debugger.output | 10 ++++++
 modules/script/_bootstrap/debugger.js              | 40 +++++++++++++++++-----
 3 files changed, 44 insertions(+), 8 deletions(-)
---
diff --git a/installed-tests/debugger/backtrace.debugger b/installed-tests/debugger/backtrace.debugger
index 6aea227d..261d388a 100644
--- a/installed-tests/debugger/backtrace.debugger
+++ b/installed-tests/debugger/backtrace.debugger
@@ -4,5 +4,7 @@ backtrace
 c
 bt
 c
+backtrace full
+bt full
 where
 q
diff --git a/installed-tests/debugger/backtrace.debugger.output 
b/installed-tests/debugger/backtrace.debugger.output
index 0f338e53..f5353e29 100644
--- a/installed-tests/debugger/backtrace.debugger.output
+++ b/installed-tests/debugger/backtrace.debugger.output
@@ -9,6 +9,16 @@ db> bt
 #0    toplevel at backtrace.debugger.js:3:0
 db> c
 Debugger statement, <anonymous>([object Array], 0, [object Array]) at backtrace.debugger.js:5:4
+db> backtrace full
+#0    <anonymous>([object Array], 0, [object Array]) at backtrace.debugger.js:5:4
+arguments = [object Arguments]
+array = [object Array]
+#1    toplevel at backtrace.debugger.js:4:36
+db> bt full
+#0    <anonymous>([object Array], 0, [object Array]) at backtrace.debugger.js:5:4
+arguments = [object Arguments]
+array = [object Array]
+#1    toplevel at backtrace.debugger.js:4:36
 db> where
 #0    <anonymous>([object Array], 0, [object Array]) at backtrace.debugger.js:5:4
 #1    toplevel at backtrace.debugger.js:4:36
diff --git a/modules/script/_bootstrap/debugger.js b/modules/script/_bootstrap/debugger.js
index 601035cd..326ec8e9 100644
--- a/modules/script/_bootstrap/debugger.js
+++ b/modules/script/_bootstrap/debugger.js
@@ -140,7 +140,7 @@ Debugger.Script.prototype.describeOffset = function describeOffset(offset) {
     return `${url}:${lineNumber}:${columnNumber}`;
 };
 
-function showFrame(f, n) {
+function showFrame(f, n, option) {
     if (f === undefined || f === null) {
         f = focusedFrame;
         if (f === null) {
@@ -153,10 +153,23 @@ function showFrame(f, n) {
         if (n === undefined)
             throw new Error('Internal error: frame not on stack');
     }
-
-    print(`#${n.toString().padEnd(4)} ${f.describeFull()}`);
+    if (!option) {
+        print(`#${n.toString().padEnd(4)} ${f.describeFull()}`);
+    } else {
+        const variables = f.environment.names();
+        print(`#${n.toString().padEnd(4)} ${f.describeFull()}`);
+        for (let i = 0; i < variables.length; i++) {
+            if (variables.length === 0)
+                print('No locals.');
+
+            const value = f.environment.getVariable(variables[i]);
+            const [brief] = debuggeeValueToString(value, {brief: false, pretty: false});
+            print(`${variables[i]} = ${brief}`);
+        }
+    }
 }
 
+
 function saveExcursion(fn) {
     const tf = topFrame, ff = focusedFrame;
     try {
@@ -187,15 +200,26 @@ quitCommand.summary = 'Quit the debugger';
 quitCommand.helpText = `USAGE
     quit`;
 
-function backtraceCommand() {
+function backtraceCommand(option) {
     if (topFrame === null)
         print('No stack.');
-    for (var i = 0, f = topFrame; f; i++, f = f.older)
-        showFrame(f, i);
+    if (option === '') {
+        for (let i = 0, f = topFrame; f; i++, f = f.older)
+            showFrame(f, i, false);
+    } else if (option === 'full') {
+        for (let i = 0, f = topFrame; f; i++, f = f.older)
+            showFrame(f, i, true);
+    } else {
+        print('Invalid option');
+    }
 }
-backtraceCommand.summary = 'Print backtrace of all stack frames';
+backtraceCommand.summary = 'Print backtrace of all stack frames and details of all local variables if the 
full option is added';
 backtraceCommand.helpText = `USAGE
-    bt`;
+    bt <option>
+
+PARAMETERS
+    · option: option name. Allowed options are:
+        · full: prints the local variables in a stack frame`;
 
 function setCommand(rest) {
     var space = rest.indexOf(' ');