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[doc/ysh-faq] Why Removed?: ...having write -- $x allowed YSH to have echo $x (#YES: an even shorter way, ... # synonym) #1829

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[doc/ysh-faq] Why Removed?: ...having write -- $x allowed YSH to have echo $x (#YES: an even shorter way, ... # synonym) #1829

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[doc/ysh-faq] conclude "unmolested" thread in consistent way
bar-g Feb 11, 2024
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thead consistency
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reasoning
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show echo equivalence
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optionless -> flagless echo
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echo's reason to be
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switch to YES / synonym examples
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use orig words
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finally making good sense
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12 changes: 7 additions & 5 deletions doc/ysh-faq.md
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Expand Up @@ -107,15 +107,17 @@ That is, `echo "$flag"` always has a few bugs: when `$flag` is `-e`, `-n`,

So portable shell scripts use:

printf '%s\n' "$x" # print $x "unmolested" in POSIX shell
printf '%s\n' "$x" # print "unmolested" in POSIX shell

We could have chosen to respect `echo -- $x`, but YSH already has:
We could have chosen to respect `echo -- $x`, but as YSH already has:

write -- $x # print $x "unmolested" in YSH
write -- $x # print $x "unmolested" in YSH

That means YSH has:
It allowed YSH to have:

echo $x # an even shorter way
echo $x # YES: an even shorter way
write --sep ' ' -- $x # synonym
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--sep ' ' is sort of irrelevant here, I think it just confuses things more

This is a FAQ entry, so not everything needs to be packed here.

That equivalence can be noted in the doc/ref topics for echo and/or write

And we can add links from the FAQ to the reference -- I've been doing that in a few places

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@bar-g bar-g Feb 27, 2024 •
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That equivalence can be noted in the doc/ref topics for echo and/or write.

But that is too late.

Probably no one thinks of first needing to read docs about echo and write, ever after a first hello world script. (And echo and write can work for a long way interchangeably as long as used with a single quoted arg.)

Thus mentioning echo and write things in the FAQ makes perfect sense, but then leaving out this line-wrapping bit is just leaving the reader in the lurch. Knowingly sending them into some error/bug situation... that will bring frequently asked questions that the FAQ... does not answer, actually glosses over?

No, I'm first-hand sure the --sep ' ' is an important bit, and the command is not a synonym without it. What's a FAQ mean to leave it out?

It's similar to why I think it's important to mention the "args on a line" vs. "a line per arg" defaults also right in the ysh-toc overview: To get the attention during early contact with ysh, i.e. when skimming the reference or reading the faq (before ysh appears to have gone "astray" on some most basic things).

I have come to understand and like the difference, but it really came as a bad surprise (intricate follow-up error, unexpected, deviating behavior), where it shall rather be a "oh, that's peculiar... ok, there are alternative ways,... hm, yes, it's really a good choice to have, makes sense".

To make this bit more explicitly apparent in the FAQ I now think it makes much sense to actually apply short additions to really complete the example here:

echo $x                # YES: an even shorter way
write --sep ' ' -- $x  # synonym
write -- $x $y         # alternative (one line per arg)

So there they are: The two idiomatic ways to "print" in ysh.
(Oh, peculiar, the FAQ has just become enlightening to read...
ok, there are alternative ways,...
hm,...)

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The hints about echo/write can be put SOMEWHERE, just not here.

This FAQ entry isn't the right place

It can be in either doc/ref or in another FAQ section perhaps, but it has to be worded well

write -- $x $y # alternative (one line per arg)

So `echo` is technically superfluous in YSH, but it's also short, familiar, and
correct.
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