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startup: if TERM is unset, try falling back to VT220 instead of failing

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Curses cannot function if not informed via TERM which type of terminal
is being used.  As many terminals are mostly compatible with a VT220,
falling back to "vt220" when TERM is unset has a good chance of giving
the user a usable nano, instead of simply failing.

(Falling back to "vt100" is not good as it contains padding delays.)

This partially addresses https://bugs.debian.org/991982.
This commit is contained in:
Benno Schulenberg 2021-09-09 16:17:04 +02:00
parent fdc0b0ac24
commit 46cdf8b745
1 changed files with 4 additions and 0 deletions
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4
src/nano.c
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@ -2055,6 +2055,10 @@ int main(int argc, char **argv)
}
}
/* Curses needs TERM; if it is unset, try falling back to a VT220. */
if (getenv("TERM") == NULL)
setenv("TERM", "vt220", 0);
/* Enter into curses mode. Abort if this fails. */
if (initscr() == NULL)
exit(1);