57 lines
2.1 KiB
Bash
57 lines
2.1 KiB
Bash
#!/bin/bash
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# Copyright (c) 2012 Yu-Jie Lin
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy of
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# this software and associated documentation files (the "Software"), to deal in
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# the Software without restriction, including without limitation the rights to
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# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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# of the Software, and to permit persons to whom the Software is furnished to do
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# so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in all
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# copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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VER_SPLIT_SED='s/\./ /g;s/\([[:digit:]]\)\([^[:digit:] ]\)/\1 \2/g;s/\([^[:digit:] ]\)\([[:digit:]]\)/\1 \2/g'
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# Compare with one element of version components
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_ver_cmp_1() {
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[[ "$1" = "$2" ]] && return 0
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if [[ -z "${1//[[:digit:]]/}" ]] && [[ -z "${2//[[:digit:]]/}" ]]; then
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# Both $1 and $2 are numbers
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# Using arithmetic comparison
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(( $1 > $2 )) && return 1
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(( $1 < $2 )) && return 2
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else
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# Either or both are not numbers, containing non-digit characters
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# Using string comparison
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[[ "$1" > "$2" ]] && return 1
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[[ "$1" < "$2" ]] && return 2
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fi
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# This should not be happening
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exit 1
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}
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version_cmp() {
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local A B i result
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A=($(sed "$VER_SPLIT_SED" <<< "$1"))
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B=($(sed "$VER_SPLIT_SED" <<< "$2"))
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i=0
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while (( i < ${#A[@]} )) && (( i < ${#B[@]})); do
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_ver_cmp_1 "${A[i]}" "${B[i]}"
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result=$?
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[[ $result =~ [12] ]] && return $result
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let i++
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done
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# Which has more, then it is the newer version
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_ver_cmp_1 "${#A[i]}" "${#B[i]}"
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return $?
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}
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