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Diffstat (limited to 'Etc')
| -rw-r--r-- | Etc/STD-TODO | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/Etc/STD-TODO b/Etc/STD-TODO new file mode 100644 index 000000000..c6a693771 --- /dev/null +++ b/Etc/STD-TODO @@ -0,0 +1,48 @@ +Last updated: Tue Aug 7 08:44:03 PDT 2001 -*- text -*- + +In this file we maintain a list of "standard shell features" (many of them +proposed as POSIX extensions by David Korn and the shell@research.acc.com +mailing list) that will require changes to zsh behavior for compatibility. + +This file is not part of the packaged zsh distribution. + +Syntax and Parsing +------------------ + +Redirections following a function body definition should be considered +part of the function defininition, and positional parameter references in +those redirections refer to the function's positionals. + +Subscript brackets do not imply double-quoting and in fact other quotings +are respected when inside the brackets. (The exact syntax of associative +array subscripts has not been decided as of this writing.) + +The "typeset" builtin and its synonyms are language keywords and apply +assignment syntax to their argument lists. (This violates POSIX?) + +Equals signs are special inside the parens in a name=(...) assignment: +- name=( [x]=a [y]=b ) is the same as name[x]=a name[y]=b +- name=( x=(a b c) y=(e f g) ) is a compound assignment (semantics not + yet agreed upon as of this writing, and might not be standardized). + + +Semantics +--------- + +Zsh's handling of "precommand modifiers" is completely unlike anything +done by any other shell. +- "noglob" and "nocorrect" are impossible and should not be treated as + special words when emulating a standard shell. +- "builtin", "command", and "exec" are true commands in other shells, and + as such take command line options etc., which is not possible with the + special rules zsh uses for these commands. + +POSIX requires that shell functions behave like macros, but does not have +the "function name() ..." syntax. Ksh uses the latter as an indicator +that extended function semantics are allowed. +- The value of $0 behaves as if FUNCTION_ARGZERO in "function name()", but + never does so in bare "name()" syntax functions. +- Local variables are statically scoped in the "function" form, but all + variables are global in the POSIX form. (Zsh uses local dynamic scope.) +- XTRACE is always local and turned off in the "function" form, unless + explicitly enabled with "typeset -ft". |