How do I print the full value of a string variable in delve?

Question

I'm using the delve go debugger to debug some code. When I try to print a string variable, it gives me an abbreviated version.

(dlv) print myString "my string...+539 more" 

How do I get it to print the full string?

Answer 1

The ability to configure the length of printed strings was recently added to delve. To see the full list of configuration options, run config -list;

(dlv) config -list aliases            map[] substitute-path    [] max-string-len     <not defined> max-array-values   <not defined> show-location-expr false 

The one we're interested in here is called max-string-len, which you can see is currently <not defined>. To increase the length to e.g. 1000, run

(dlv) config max-string-len 1000 

Now running print myString should print the whole string.

Answer 2

Just to add to your answer, if you're using VS Code debugging feature, add the following config to your settings.json:

    "go.delveConfig": {         "dlvLoadConfig": {             "maxStringLen": 1024,         },         "apiVersion": 2,     },