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Sun, 3 Jul 2022 12:44:15 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface User-Agent: Cyrus-JMAP/3.7.0-alpha0-713-g1f035dc716-fm-20220617.001-g1f035dc7 Mime-Version: 1.0 Message-Id: <1abf958a-d326-400e-97ec-aaec04ed2c11@www.fastmail.com> In-Reply-To: References: <11ca04c9-1503-4cd2-a44b-635dc53e43a8@www.fastmail.com> Date: Sun, 03 Jul 2022 12:43:54 -0400 From: "Anthony Heading" To: "Bart Schaefer" Cc: "Zsh Users" Subject: Re: indirect array element assignment? Content-Type: text/plain X-Seq: 27864 Archived-At: X-Loop: zsh-users@zsh.org Errors-To: zsh-users-owner@zsh.org Precedence: list Precedence: bulk Sender: zsh-users-request@zsh.org X-no-archive: yes List-Id: List-Help: List-Subscribe: List-Unsubscribe: List-Post: List-Owner: List-Archive: On Sat, Jul 2, 2022, at 11:41 PM, Bart Schaefer wrote: > That does in fact mean that this works too, now that I think of it: > > ${(P)${:-${v}[2]}::=mango} Even better! Though gosh it does start to cry out for dedicated assignment syntax/parsing. I always though it was rather a pity that some predecessor (ksh maybe?) claimed 'let' for arithmetic so it's not free: let ${v}[2] ?= (peach apricot) etc would be easier to deal with. But perhaps this was the thought-process that unleashed csh on the world, so maybe not. > For that to work, ${${X}} would have to mean the same as ${(P)X}. As > a general rule nested expansions are processed innermost-leftmost, and > substitute rvalues rather than lvalues. Yes. It didn't seem *too* far off, but I traced it now with gdb through paramsubst() and I follow what you mean.