diff options
Diffstat (limited to 'functions.sh')
| -rw-r--r-- | functions.sh | 74 |
1 files changed, 54 insertions, 20 deletions
diff --git a/functions.sh b/functions.sh index 0c35b2d..1548bd0 100644 --- a/functions.sh +++ b/functions.sh @@ -1,6 +1,6 @@ # Copyright 1999-2023 Gentoo Authors # Distributed under the terms of the GNU General Public License v2 -# shellcheck shell=sh disable=3043 +# shellcheck shell=sh disable=2209,3043 # This file contains a series of function declarations followed by some # initialisation code. Functions intended for internal use shall be prefixed @@ -401,7 +401,7 @@ is_int() # is_older_than() { - local ref has_gfind + local ref if [ "$#" -eq 0 ]; then warn "is_older_than: too few arguments (got $#, expected at least 1)" @@ -412,26 +412,39 @@ is_older_than() ref= fi shift + { test "$#" -gt 0 && printf '%s\0' "$@"; } \ + | "${genfun_bin_find}" -L -files0-from - ${ref:+-newermm} ${ref:+"${ref}"} -printf '\n' -quit \ + | read -r _ +} - # Check whether GNU find is installed by the name of "gfind". So as to - # avoid repeated PATH lookups, run the hash builtin in the present - # shell, prior to forking. - hash gfind 2>/dev/null; has_gfind=$(( $? == 0 )) +# +# Considers one or more pathnames and prints the one having the newest +# modification time. If at least one parameter is provided, all parameters shall +# be considered as pathnames to be compared to one another. Otherwise, the +# pathnames to be compared shall be read from the standard input as +# NUL-delimited records. If no pathnames are given, or those specified do not +# exist, the return value shall be greater than 0. In the case that two or more +# pathnames are candidates, the one having the lexicographically greatest value +# shall be selected. Pathnames containing newline characters shall be ignored. +# +newest() +{ + _select_by_mtime -r "$@" +} - for path; do - if [ -e "${path}" ]; then - printf '%s\0' "${path}" - fi - done | - { - set -- -L -files0-from - ${ref:+-newermm} ${ref:+"${ref}"} -printf '\n' -quit - if [ "${has_gfind}" -eq 1 ]; then - gfind "$@" - else - find "$@" - fi - } | - read -r _ +# +# Considers one or more pathnames and prints the one having the oldest +# modification time. If at least one parameter is provided, all parameters shall +# be considered as pathnames to be compared to one another. Otherwise, the +# pathnames to be compared shall be read from the standard input as +# NUL-delimited records. If no pathnames are given, or those specified do not +# exist, the return value shall be greater than 0. In the case that two or more +# pathnames are candidates, the one having the lexicographically lesser value +# shall be selected. Pathnames containing newline characters shall be ignored. +# +oldest() +{ + _select_by_mtime -- "$@" } # @@ -727,6 +740,24 @@ _print_args() } # +# See the definitions of oldest() and newest(). +# +_select_by_mtime() { + local sort_opt + + sort_opt=$1 + shift + if [ "$#" -ge 0 ]; then + printf '%s\0' "$@" + else + cat + fi \ + | "${genfun_bin_find}" -files0-from - -maxdepth 0 ! -path "*${genfun_newline}*" -printf '%T+ %p\n' \ + | sort "${sort_opt}" \ + | { IFS= read -r line && printf '%s\n' "${line#* }"; } +} + +# # Determines whether the terminal on STDIN is able to report its dimensions. # Upon success, the number of columns shall be stored in genfun_cols. # @@ -805,6 +836,9 @@ if [ "${BASH}" ]; then genfun_bin_true=$(type -P true) fi +# Store the name of the GNU find binary. Some platforms may have it as "gfind". +hash gfind 2>/dev/null && genfun_bin_find=gfind || genfun_bin_find=find + # Determine whether the use of color is to be wilfully avoided. if [ -n "${NO_COLOR}" ]; then # See https://no-color.org/. |