From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 6457 invoked by alias); 2 Apr 2017 22:57:56 -0000 Mailing-List: contact zsh-workers-help@zsh.org; run by ezmlm Precedence: bulk X-No-Archive: yes List-Id: Zsh Workers List List-Post: List-Help: X-Seq: 40931 Received: (qmail 20760 invoked from network); 2 Apr 2017 22:57:56 -0000 X-Qmail-Scanner-Diagnostics: from mail-vk0-f53.google.com by f.primenet.com.au (envelope-from , uid 7791) with qmail-scanner-2.11 (clamdscan: 0.99.2/21882. spamassassin: 3.4.1. Clear:RC:0(209.85.213.53):SA:0(-0.0/5.0):. Processed in 0.937221 secs); 02 Apr 2017 22:57:56 -0000 X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on f.primenet.com.au X-Spam-Level: X-Spam-Status: No, score=-0.0 required=5.0 tests=RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H3,RCVD_IN_MSPIKE_WL,SPF_PASS,T_DKIM_INVALID autolearn=unavailable autolearn_force=no version=3.4.1 X-Envelope-From: schaefer@brasslantern.com X-Qmail-Scanner-Mime-Attachments: | X-Qmail-Scanner-Zip-Files: | Received-SPF: pass (ns1.primenet.com.au: SPF record at _netblocks.google.com designates 209.85.213.53 as permitted sender) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=brasslantern-com.20150623.gappssmtp.com; s=20150623; h=from:message-id:date:in-reply-to:comments:references:to:subject :mime-version; bh=gf30Kjxu/FaVJXlyXEuWeUHtQZ2u/RAShHEb3EM/2+0=; b=lS6FzW0ynv1lMov1z6qycaUQEKPJ7tLdBRCjI3efD9tTQVuPmEl6PgwnRK1Rl+jcvV 8U9KQkBpykL5TXGAkds2GiHFbNL8wIEpTiaHgg2BuViUG63kci2AsJYEPoQyvxYT+xaB XA4ozLWcl8LqqzaPKOuyTRxEFZYAPvLFXDEfxB/9jb2xcif0traY/+4L5XJIu8NFMy53 Rflhve5bEmDaQXkXPZvUI284rgVcMp8ztN2eOvjMZ6tjH+fHCdf52I4c70ttYSwvQmg6 MA/npbmfpjp53udNHEXBHYoLJ9eewEblOt29mmJ0kYGOTwzY8zV9QEHabaXAQKbmXL1o IgqA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:message-id:date:in-reply-to:comments :references:to:subject:mime-version; bh=gf30Kjxu/FaVJXlyXEuWeUHtQZ2u/RAShHEb3EM/2+0=; b=tZrcR0Ew3qPBaRojzqwpRMoon/xhzi67YROHAY+eDlJcYvbVM9j0Sq0SKXRE1rMNhB opxjiflr5HUvX2XN1pPh268YhRXtoZp5XKILOM9vHpE/NIWHDn2fq0ijWR1MLi/bSLlR 1FLUTPHw+yYP/v8m1R02SUIXG9MbZpi4pDiDMGbiqFBzKsoMcJNIyVuCiVbUbvHmrCEF qSEaMcJLswC+G5+U3Pgqb/3PcpgR0jckXgF8lq3DrvcYFbkM+WZqZjT6TeZedRAiCsRR FD0tqXiH3QfACBVn9xd/sEQXMP5A3Qs+BRSYpj87MhLLLQLwlKoyCxUAwhZ83i2Xuk8x pBBg== X-Gm-Message-State: AFeK/H0B5txq/BsT3GdobZPQEAbQIT5Tat61SLRRNu5adu5Ly9XTP40kXhMFc6qVURXAgw== X-Received: by 10.176.88.194 with SMTP id r2mr7428894uac.139.1491173866814; Sun, 02 Apr 2017 15:57:46 -0700 (PDT) From: Bart Schaefer Message-Id: <170402155749.ZM9915@torch.brasslantern.com> Date: Sun, 2 Apr 2017 15:57:49 -0700 In-Reply-To: Comments: In reply to Sebastian Gniazdowski "RE: (m)-flag for boundary cases" (Mar 21, 2:02pm) References: X-Mailer: OpenZMail Classic (0.9.2 24April2005) To: zsh-workers@zsh.org Subject: Re: (m)-flag for boundary cases MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii On Mar 21, 2:02pm, Sebastian Gniazdowski wrote: } Subject: RE: (m)-flag for boundary cases } } > dw=3 # Desired width } > echo ${(mr:dw::_:)a[1,${(m)#a[1,dw-1]}>dw?dw/2:dw]} } } Mixed character widths are possibile. } [...] } } So if one could fix the trailing-a absence, it seems it would work. # dw is the "desired width" [or "display width"] function # Declare to accept a string because subscripts hate extra commas, # and because we need to pass a parameter by name not by math value. # Call it in math context (e.g., a scalar slice subscript) like: # dw(paramname:width) # Returns largest index w of a full character in $paramname, such # that ${paramname[1,w]} occupies $width or fewer display positions. dw() { integer w set -- "${(@s,:,)1}" [[ -z ${(P)1} ]] && return -1 for ((w=$2; ${(m)#${(P)1}[1,w]} > $2; w-- )); do :; done return w } functions -M -s dw Given the above this example -- echo ${(mr:9::_:)string[1,dw(string:9)]} -- always outputs a string nine display positions wide, padded on the right with underscores, regardless of the mix of character widths in the value of $string. Optimizations, if any, left to the reader.