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contrib/shell/realpath.bash
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Carl Dong
guix: Add source-able bash prelude and utils
05 апр 2021, 18:00
05 апр 2021, 18:00
7753357
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#!/usr/bin/env bash # Based on realpath.sh written by Michael Kropat # Found at: https://github.com/mkropat/sh-realpath/blob/65512368b8155b176b67122aa395ac580d9acc5b/realpath.sh bash_realpath() { canonicalize_path "$(resolve_symlinks "$1")" } resolve_symlinks() { _resolve_symlinks "$1" } _resolve_symlinks() { _assert_no_path_cycles "$@" || return local dir_context path if path=$(readlink -- "$1"); then dir_context=$(dirname -- "$1") _resolve_symlinks "$(_prepend_dir_context_if_necessary "$dir_context" "$path")" "$@" else printf '%s\n' "$1" fi } _prepend_dir_context_if_necessary() { if [ "$1" = . ]; then printf '%s\n' "$2" else _prepend_path_if_relative "$1" "$2" fi } _prepend_path_if_relative() { case "$2" in /* ) printf '%s\n' "$2" ;; * ) printf '%s\n' "$1/$2" ;; esac } _assert_no_path_cycles() { local target path target=$1 shift for path in "$@"; do if [ "$path" = "$target" ]; then return 1 fi done } canonicalize_path() { if [ -d "$1" ]; then _canonicalize_dir_path "$1" else _canonicalize_file_path "$1" fi } _canonicalize_dir_path() { (cd "$1" 2>/dev/null && pwd -P) } _canonicalize_file_path() { local dir file dir=$(dirname -- "$1") file=$(basename -- "$1") (cd "$dir" 2>/dev/null && printf '%s/%s\n' "$(pwd -P)" "$file") }