VSCode CodeLLDB Crystal Configuration

README.md

These configuration will let you use CodeLLDB extension to debug Crystal programs.

Store them as .vscode/tasks.json and .vscode/launch.json in your project.

When starting the debugging the current file will be built in the bin/ folder (as in shards build).

Note: You will need to set the crystal binary path in tasks.json "command" field and the whole path in launch.json "initCommands". Read more at #8538

launch.json

{
  // Use IntelliSense to learn about possible attributes.
  // Hover to view descriptions of existing attributes.
  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
  "version": "0.2.0",
  "configurations": [
    {
      "type": "lldb",
      "request": "launch",
      "name": "crystal: debug current file",
      "preLaunchTask": "crystal: build current file (debug)",
      "program": "${workspaceFolder}/bin/${fileBasenameNoExtension}",
      "args": [],
      "cwd": "${workspaceFolder}",
      "initCommands": [
        "command script import /path/to/crystal/etc/lldb/crystal_formatters.py"
      ]
    }
  ]
}

tasks.json

{
  // See https://go.microsoft.com/fwlink/?LinkId=733558
  // for the documentation about the tasks.json format
  "version": "2.0.0",
  "tasks": [
    {
      "label": "crystal: build current file (debug)",
      "type": "shell",
      "command": "crystal build --debug ${relativeFile} -o bin/${fileBasenameNoExtension}"
    }
  ]
}

Hello,

I try to start my first Crystal programm. I use Visual Sudio Code in a Windows-Subsystem for Linux Ubuntu 20.04 LTS.

CodeLLDB 1.6.1 is installed

Wenn I start debugging there comes serval errors in the TERMINAL-window:

---

Executing task: crystal build --debug .vscode/tasks.json -o bin/tasks <
In .vscode/tasks.json:2:6
2 | // See https://go.microsoft.com/fwlink/?LinkId=733558
^
Error: expecting token '=>', not 'See'
The terminal process "/bin/bash '-c', 'crystal build --debug .vscode/tasks.json -o bin/tasks'" failed to launch (exit code: 1).
Terminal will be reused by tasks, press any key to close it.

---

After removing the remarks in tasks.json and launch.json there is a problem with:

---

In .vscode/launch.json:10:17
10 | "args": [],
^
Error: for empty arrays use '[] of ElementType'
The terminal process "/bin/bash '-c', 'crystal build --debug .vscode/launch.json -o bin/launch'" terminated with exit code: 1.

---

Next try after removing args:

---

Executing task: crystal build --debug .vscode/launch.json -o bin/launch <
/usr/bin/ld: cannot open output file /mnt/c/linux/crystal/firstapp/src/bin/launch: No such file or directory
collect2: error: ld returned 1 exit status
Error: execution of command failed with code: 1: cc "${@}" -o /mnt/c/linux/crystal/firstapp/src/bin/launch -rdynamic -L/usr/bin/../lib/crystal/lib -lpcre -lm -lgc -lpthread /usr/share/crystal/src/ext/libcrystal.a -levent -lrt -ldl
The terminal process "/bin/bash '-c', 'crystal build --debug .vscode/launch.json -o bin/launch'" terminated with exit code: 1.

---

Do somebody have an idea?

Thanks a lot

Bob