CODEWITHSUNDEEP
tclconcatenationnewlinestring-concatenation
Natiya
Natiya

Reputation: 473

concat variables in new lines with TCL

I'd like to concat some string-based variables and I want each of them in a new line. However, I can't find the correct way to write the code. This is what I tried:

set mensaje "Error: esta atenuacion: $att dB\n"

gset listaMensajes  [concat [gget listaMensajes] "$mensaje"]

set mensaje "Error: esta atenuacion: $att dB\n"

gset listaMensajes  [concat [gget listaMensajes] "$mensaje"]

puts "[gget listaMensajes]"

The variable $att takes different values in the different parts of the code.

I also tried:

gset listaMensajes  [concat [gget listaMensajes] "\n" "$mensaje"]

but none of them work; I get the messages in the same line

Upvotes: 0

Views: 3151

Answers (1)

Peter Lewerin
Peter Lewerin

Reputation: 13252

The concat command strips whitespace between its arguments, so it isn't much use here. What you probably want is the join command. Since you are using non-standard commands, I can't recreate your case, but say that foo is a command that returns a list of strings:

join [foo] \n

returns a string consisting of the strings returned by foo, with a newline chaaracter joining each string pair.

This of course also works if you have a list of strings in a variable called bar:

join $bar \n

Or if you build a list in a command substitution:

join [list "foo bar" "baz qux"] \n

Documentation: concat, join

Upvotes: 1

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