[Bug]: TCR crashes when language provided as parameter does not exist

[mengdaming]

Contact Details

damien.menanteau@gmail.com

Describe the bug

When running TCR with a language parameter value that does not match any of the built-in languages not any of the custom languages defined through configuration files, TCR crashes with the following trace:

panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xc0000005 code=0x1 addr=0xa0 pc=0x7aaa41]

goroutine 1 [running]:
github.com/murex/tcr/tcr-engine/language.(*Language).setBaseDir(...)
.../tcr/tcr-engine/language/language.go:316

To Reproduce

Steps to reproduce the behavior:

1. Open a terminal and run tcr -l xxx
2. The trace shows a runtime error, as described in previous section

Expected behavior

I expected TCR to exit with a message saying that language "xxx" is not supported

Working Environment

1. OS: Any
2. Version: TCR v0.10.0

Additional Context

Cause of the error:

call to language.(*Language).setBaseDir(...) on a nil language instance pointer

Fix:

call setBaseDir(...) only when language instance pointer is not nil

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