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45110: zshmisc(1): Fix markup of "try-list" and "always-list".

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Daniel Shahaf 2019-12-21 12:41:04 +00:00
parent a0c0aa41d2
commit f7f2baac5e
2 changed files with 15 additions and 12 deletions
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ChangeLog
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@ -1,5 +1,8 @@
2019-12-22 Daniel Shahaf <danielsh@apache.org>
* 45110: Doc/Zsh/grammar.yo: zshmisc(1): Fix markup of "try-list"
and "always-list".
* 45111: Doc/Zsh/grammar.yo, Etc/BUGS, NEWS,
Test/A01grammar.ztst: zshmisc(1): Clarify the documentation of
'return' and 'exit' in conjunction with try/always

24
Doc/Zsh/grammar.yo
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@ -313,23 +313,23 @@ An `error' in this context is a condition such as a syntax error which
causes the shell to abort execution of the current function, script, or
list. Syntax errors encountered while the shell is parsing the
code do not cause the var(always-list) to be executed. For example,
an erroneously constructed tt(if) block in tt(try-list) would cause the
shell to abort during parsing, so that tt(always-list) would not be
an erroneously constructed tt(if) block in var(try-list) would cause the
shell to abort during parsing, so that var(always-list) would not be
executed, while an erroneous substitution such as tt(${*foo*}) would
cause a run-time error, after which tt(always-list) would be executed.
cause a run-time error, after which var(always-list) would be executed.
An error condition can be tested and reset with the special integer
variable tt(TRY_BLOCK_ERROR). Outside an tt(always-list) the value is
irrelevant, but it is initialised to tt(-1). Inside tt(always-list), the
value is 1 if an error occurred in the tt(try-list), else 0. If
tt(TRY_BLOCK_ERROR) is set to 0 during the tt(always-list), the error
condition caused by the tt(try-list) is reset, and shell execution
continues normally after the end of tt(always-list). Altering the value
during the tt(try-list) is not useful (unless this forms part of an
variable tt(TRY_BLOCK_ERROR). Outside an var(always-list) the value is
irrelevant, but it is initialised to tt(-1). Inside var(always-list), the
value is 1 if an error occurred in the var(try-list), else 0. If
tt(TRY_BLOCK_ERROR) is set to 0 during the var(always-list), the error
condition caused by the var(try-list) is reset, and shell execution
continues normally after the end of var(always-list). Altering the value
during the var(try-list) is not useful (unless this forms part of an
enclosing tt(always) block).
Regardless of tt(TRY_BLOCK_ERROR), after the end of tt(always-list) the
normal shell status tt($?) is the value returned from tt(try-list).
Regardless of tt(TRY_BLOCK_ERROR), after the end of var(always-list) the
normal shell status tt($?) is the value returned from var(try-list).
This will be non-zero if there was an error, even if tt(TRY_BLOCK_ERROR)
was set to zero.