fix(ellipsize): use POSIX-safe slicing via awk

Author: rdavid

README.adoc

@@ -89,48 +89,48 @@ The public functions are, in alphabetical order:
 {url-base}#L246[`dng2jpg`],
 {url-base}#L252[`echo`],
 {url-base}#L274[`ellipsize`],
-{url-base}#L292[`file_exists`],
-{url-base}#L301[`gitlog`],
-{url-base}#L325[`grbt`],
-{url-base}#L337[`handle_pipefails`],
-{url-base}#L343[`heic2jpg`],
-{url-base}#L356[`inside`],
-{url-base}#L363[`isempty`],
-{url-base}#L387[`isfunc`],
-{url-base}#L400[`isnumber`],
-{url-base}#L408[`isreadable`],
-{url-base}#L417[`isroot`],
-{url-base}#L429[`issolid`],
-{url-base}#L463[`iswritable`],
-{url-base}#L477[`log`],
-{url-base}#L486[`loge`],
-{url-base}#L494[`logw`],
-{url-base}#L503[`map_del`],
-{url-base}#L523[`map_get`],
-{url-base}#L545[`map_put`],
-{url-base}#L557[`nmea2gpx`],
-{url-base}#L576[`pdf2jpg`],
-{url-base}#L581[`pdf2png`],
-{url-base}#L600[`prettytable`],
-{url-base}#L626[`prettyuptime`],
-{url-base}#L649[`realdir`],
-{url-base}#L658[`realpath`],
-{url-base}#L671[`semver`],
-{url-base}#L689[`should_continue`],
-{url-base}#L745[`timestamp`],
-{url-base}#L765[`tolog`],
-{url-base}#L771[`tologe`],
-{url-base}#L778[`tolower`],
-{url-base}#L796[`totsout`],
-{url-base}#L802[`tsout`],
-{url-base}#L810[`url_exists`],
-{url-base}#L834[`user_exists`],
-{url-base}#L850[`validate_cmd`],
-{url-base}#L857[`validate_var`],
-{url-base}#L864[`var_exists`],
-{url-base}#L898[`ver_ge`],
-{url-base}#L906[`vid2aud`],
-{url-base}#L920[`ytda`].
+{url-base}#L300[`file_exists`],
+{url-base}#L309[`gitlog`],
+{url-base}#L333[`grbt`],
+{url-base}#L345[`handle_pipefails`],
+{url-base}#L351[`heic2jpg`],
+{url-base}#L364[`inside`],
+{url-base}#L371[`isempty`],
+{url-base}#L395[`isfunc`],
+{url-base}#L408[`isnumber`],
+{url-base}#L416[`isreadable`],
+{url-base}#L425[`isroot`],
+{url-base}#L437[`issolid`],
+{url-base}#L471[`iswritable`],
+{url-base}#L485[`log`],
+{url-base}#L494[`loge`],
+{url-base}#L502[`logw`],
+{url-base}#L511[`map_del`],
+{url-base}#L531[`map_get`],
+{url-base}#L553[`map_put`],
+{url-base}#L565[`nmea2gpx`],
+{url-base}#L584[`pdf2jpg`],
+{url-base}#L589[`pdf2png`],
+{url-base}#L608[`prettytable`],
+{url-base}#L634[`prettyuptime`],
+{url-base}#L657[`realdir`],
+{url-base}#L666[`realpath`],
+{url-base}#L679[`semver`],
+{url-base}#L697[`should_continue`],
+{url-base}#L753[`timestamp`],
+{url-base}#L773[`tolog`],
+{url-base}#L779[`tologe`],
+{url-base}#L786[`tolower`],
+{url-base}#L804[`totsout`],
+{url-base}#L810[`tsout`],
+{url-base}#L818[`url_exists`],
+{url-base}#L842[`user_exists`],
+{url-base}#L858[`validate_cmd`],
+{url-base}#L865[`validate_var`],
+{url-base}#L872[`var_exists`],
+{url-base}#L906[`ver_ge`],
+{url-base}#L914[`vid2aud`],
+{url-base}#L928[`ytda`].
 
 Global variables have the `BASE_` prefix and can be used by clients.
 Clients should place temporary files under `$BASE_WIP`.
@@ -205,7 +205,7 @@ eval "$(
 log I\'m using the shellbase.
 ----
 
-{url-base}#L600[`prettytable`] example:
+{url-base}#L608[`prettytable`] example:
 
 [,sh]
 ----

app/test-ellipsize-no

@@ -0,0 +1,7 @@
+#!/bin/sh
+# vi:et lbr noet sw=2 ts=2 tw=79 wrap
+# SPDX-FileCopyrightText: 2026 David Rabkin
+# SPDX-License-Identifier: 0BSD
+# shellcheck disable=SC1090,SC1091 # File not following.
+. "$(CDPATH='' cd -- "$(dirname -- "$0")" && pwd -P)"/../lib/base.sh
+ellipsize abc qwe

lib/base.sh

@@ -47,7 +47,7 @@ BASE_RC_CON_NO=14
 BASE_RC_CON_TO=13
 BASE_RC_DIE_NO=10
 BASE_SHOULD_CON=false
-BASE_VERSION=0.9.20260404
+BASE_VERSION=0.9.20260407
 
 # Removes any file besides mp3, m4a, flac in the current directory.
 # Removes empty directories.
@@ -272,7 +272,16 @@ echo() {
 # The origin of the idea:
 #  https://github.com/yegor256/ellipsized
 ellipsize() {
-	local beg max="$2" str="$1" end
+	local beg end max="$2" str="$1"
+	[ $# -eq 2 ] || {
+		loge ellipsize: expected 2 arguments, got "$#".
+		return $BASE_RC_ARG_NO
+	}
+	isnumber "$max" || {
+		loge ellipsize: max is not numeric: "$max".
+		return $BASE_RC_ARG_NO
+	}
+	cmd_exists awk || return $?
 	[ "${#str}" -le "$max" ] && {
 		printf %s "$str"
 		return
@@ -281,9 +290,16 @@ ellipsize() {
 	end=$beg
 	[ $((beg + end + 3)) -lt "$max" ] && beg=$((beg + 1))
 	[ "$beg" -gt "$max" ] && beg=$max
-
-	# shellcheck disable=SC3057
-	printf %s "${str:0:beg}...${str:$((${#str} - end))}"
+	awk \
+		-v b="$beg" \
+		-v e="$end" \
+		-v s="$str" \
+		'BEGIN {
+			n = length(s)
+			p = (b > 0) ? substr(s, 1, b) : ""
+			q = (e > 0) ? substr(s, n - e + 1) : ""
+			printf "%s...%s", p, q
+		}'
 }
 
 # Verifies the existence of all files. Iterates through the arguments,