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71 lines
1.4 KiB
Bash
71 lines
1.4 KiB
Bash
#!/usr/bin/env bash
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# Based on realpath.sh written by Michael Kropat
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# Found at: https://github.com/mkropat/sh-realpath/blob/65512368b8155b176b67122aa395ac580d9acc5b/realpath.sh
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bash_realpath() {
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canonicalize_path "$(resolve_symlinks "$1")"
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}
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resolve_symlinks() {
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_resolve_symlinks "$1"
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}
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_resolve_symlinks() {
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_assert_no_path_cycles "$@" || return
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local dir_context path
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if path=$(readlink -- "$1"); then
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dir_context=$(dirname -- "$1")
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_resolve_symlinks "$(_prepend_dir_context_if_necessary "$dir_context" "$path")" "$@"
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else
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printf '%s\n' "$1"
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fi
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}
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_prepend_dir_context_if_necessary() {
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if [ "$1" = . ]; then
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printf '%s\n' "$2"
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else
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_prepend_path_if_relative "$1" "$2"
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fi
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}
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_prepend_path_if_relative() {
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case "$2" in
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/* ) printf '%s\n' "$2" ;;
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* ) printf '%s\n' "$1/$2" ;;
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esac
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}
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_assert_no_path_cycles() {
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local target path
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target=$1
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shift
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for path in "$@"; do
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if [ "$path" = "$target" ]; then
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return 1
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fi
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done
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}
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canonicalize_path() {
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if [ -d "$1" ]; then
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_canonicalize_dir_path "$1"
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else
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_canonicalize_file_path "$1"
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fi
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}
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_canonicalize_dir_path() {
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(cd "$1" 2>/dev/null && pwd -P)
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}
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_canonicalize_file_path() {
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local dir file
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dir=$(dirname -- "$1")
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file=$(basename -- "$1")
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(cd "$dir" 2>/dev/null && printf '%s/%s\n' "$(pwd -P)" "$file")
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}
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