├── .github ├── dependabot.yml └── workflows │ └── ci.yaml ├── LICENSE ├── README.md ├── go.mod ├── go.sum └── pkg └── systemdtime ├── systemdtime.go └── systemdtime_test.go /.github/dependabot.yml: -------------------------------------------------------------------------------- 1 | # To get started with Dependabot version updates, you'll need to specify which 2 | # package ecosystems to update and where the package manifests are located. 3 | # Please see the documentation for all configuration options: 4 | # https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates 5 | 6 | version: 2 7 | updates: 8 | - package-ecosystem: "gomod" # See documentation for possible values 9 | directory: "/" # Location of package manifests 10 | schedule: 11 | interval: "weekly" 12 | -------------------------------------------------------------------------------- /.github/workflows/ci.yaml: -------------------------------------------------------------------------------- 1 | name: ci 2 | 3 | on: 4 | push: 5 | branch: 6 | - $default-branch 7 | pull_request: 8 | 9 | jobs: 10 | ci: 11 | name: ci 12 | runs-on: ubuntu-latest 13 | steps: 14 | - name: checkout 15 | uses: actions/checkout@v2 16 | - name: test 17 | run: go test -v ./... 18 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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Limitation of Liability. 601 | 602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 610 | SUCH DAMAGES. 611 | 612 | 17. Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # go-systemd-time 2 | 3 | ![ci](https://github.com/trstringer/go-systemd-time/workflows/ci/badge.svg) 4 | 5 | _Go implementation of systemd time (`man systemd.time`)_ 6 | 7 | In command line applications, it is convenient to use the notation since `-1day`, or in `5 hours`. This package takes that string (using systemd time specs) and converts it into `time.Duration`. There is also a helper function that can take the raw string time adjustment and a `time.Time` (or `nil` for `time.Now()`) object and apply the adjustment to immutably. See below for usage. 8 | 9 | ## Usage 10 | 11 | ```go 12 | package main 13 | 14 | import ( 15 | "fmt" 16 | "os" 17 | "time" 18 | 19 | "github.com/trstringer/go-systemd-time/pkg/systemdtime" 20 | ) 21 | 22 | func main() { 23 | now := time.Now() 24 | timeFormat := "3:04 PM on January 2, 2006" 25 | 26 | fmt.Printf("Now is %s\n", now.Format(timeFormat)) 27 | 28 | adjustedTime, err := systemdtime.AdjustTime(now, "2d") 29 | if err != nil { 30 | fmt.Printf("error adjusting time: %v\n", err) 31 | os.Exit(1) 32 | } 33 | fmt.Printf("Adjusted is %s\n", adjustedTime.Format(timeFormat)) 34 | /* 35 | Now is 8:38 PM on September 30, 2020 36 | Adjusted is 8:38 PM on October 2, 2020 37 | */ 38 | } 39 | ``` 40 | 41 | ## Bug reports and running tests 42 | 43 | If a bug is found, please write a failing test to uncover the bug. 44 | 45 | To run tests, navigate to the root directory and run `go test -v ./...`. 46 | -------------------------------------------------------------------------------- /go.mod: -------------------------------------------------------------------------------- 1 | module github.com/trstringer/go-systemd-time 2 | 3 | go 1.14 4 | -------------------------------------------------------------------------------- /go.sum: -------------------------------------------------------------------------------- 1 | github.com/trstringer/go-systemd-time v0.0.0-20200925004719-592a1fb748d0 h1:O36uxjg2VBY3PIV877zOwguubMlRPUBvOigu9Zk7ATw= 2 | github.com/trstringer/go-systemd-time v0.0.0-20200925004719-592a1fb748d0/go.mod h1:zmxXIRFeksWrNr4tdJeHBvxev3nmViuoEZNs+OllX20= 3 | -------------------------------------------------------------------------------- /pkg/systemdtime/systemdtime.go: -------------------------------------------------------------------------------- 1 | package systemdtime 2 | 3 | import ( 4 | "fmt" 5 | "regexp" 6 | "strconv" 7 | "strings" 8 | "time" 9 | ) 10 | 11 | // UnitToDuration converts a systemd unit (e.g. "day") to time.Duration 12 | func UnitToDuration(unit string) (time.Duration, error) { 13 | // microseconds 14 | if matched, err := regexp.MatchString(`^us(ec)?$`, unit); err == nil && matched { 15 | return time.Microsecond, nil 16 | } 17 | 18 | // milliseconds 19 | if matched, err := regexp.MatchString(`^ms(ec)?$`, unit); err == nil && matched { 20 | return time.Millisecond, nil 21 | } 22 | 23 | // seconds 24 | if matched, err := regexp.MatchString(`^s(ec(onds?)?)?$`, unit); err == nil && matched { 25 | return time.Second, nil 26 | } 27 | 28 | // minutes 29 | if matched, err := regexp.MatchString(`^m(in(utes?)?)?$`, unit); err == nil && matched { 30 | return time.Minute, nil 31 | } 32 | 33 | // hours 34 | if matched, err := regexp.MatchString(`^(hr|h(ours?)?)$`, unit); err == nil && matched { 35 | return time.Hour, nil 36 | } 37 | 38 | // days 39 | if matched, err := regexp.MatchString(`^d(ays?)?$`, unit); err == nil && matched { 40 | return 24 * time.Hour, nil 41 | } 42 | 43 | // weeks 44 | if matched, err := regexp.MatchString(`^w(eeks?)?$`, unit); err == nil && matched { 45 | return 7 * 24 * time.Hour, nil 46 | } 47 | 48 | // months 49 | if matched, err := regexp.MatchString(`^(M|months?)$`, unit); err == nil && matched { 50 | return time.Duration(30.44 * float64(24) * float64(time.Hour)), nil 51 | } 52 | 53 | // years 54 | if matched, err := regexp.MatchString(`^y(ears?)?$`, unit); err == nil && matched { 55 | return time.Duration(365.25 * float64(24) * float64(time.Hour)), nil 56 | } 57 | 58 | return 0, fmt.Errorf("Unit %s did not match", unit) 59 | } 60 | 61 | // ParseDuration converts a systemd relative time string into time.Duration 62 | func ParseDuration(raw string) (time.Duration, error) { 63 | re, err := regexp.Compile(`^\s*-?\s*(\d+\s*[a-z]+)`) 64 | if err != nil { 65 | return 0, err 66 | } 67 | 68 | if !re.MatchString(raw) { 69 | return 0, fmt.Errorf("ParseDuration: incorrect format for raw input %s", raw) 70 | } 71 | 72 | reNegative, err := regexp.Compile(`^\s*-.*`) 73 | if err != nil { 74 | return 0, err 75 | } 76 | isNegative := reNegative.MatchString(raw) 77 | 78 | reGroups, err := regexp.Compile(`\d+\s*[a-z]+`) 79 | if err != nil { 80 | return 0, err 81 | } 82 | 83 | matches := reGroups.FindAllString(raw, -1) 84 | 85 | totalDuration := time.Duration(0) 86 | reSubGroup, err := regexp.Compile(`^(\d+)\s*([a-z]+)$`) 87 | if err != nil { 88 | return 0, err 89 | } 90 | for _, match := range matches { 91 | matchTrimmed := strings.Replace(match, " ", "", -1) 92 | subGroupMatches := reSubGroup.FindStringSubmatch(matchTrimmed) 93 | 94 | // if we run into a case where there aren't exactly two matches 95 | // then that means this is an unexpected string and we should error out 96 | if len(subGroupMatches) != 3 { 97 | return 0, fmt.Errorf("Unexpected match count for '%s': expected 2 and got %d", matchTrimmed, len(subGroupMatches)) 98 | } 99 | 100 | subGroupMatchValue, err := strconv.Atoi(subGroupMatches[1]) 101 | if err != nil { 102 | return 0, err 103 | } 104 | 105 | subGroupMatchUnit, err := UnitToDuration(subGroupMatches[2]) 106 | if err != nil { 107 | return 0, err 108 | } 109 | 110 | totalDuration += time.Duration(subGroupMatchValue) * subGroupMatchUnit 111 | } 112 | 113 | if isNegative { 114 | totalDuration *= -1 115 | } 116 | 117 | return totalDuration, nil 118 | } 119 | 120 | // AdjustTime takes a systemd time adjustment string and uses it to modify a time.Time 121 | func AdjustTime(original time.Time, adjustment string) (time.Time, error) { 122 | duration, err := ParseDuration(adjustment) 123 | if err != nil { 124 | return time.Time{}, err 125 | } 126 | 127 | return original.Add(duration), nil 128 | } 129 | -------------------------------------------------------------------------------- /pkg/systemdtime/systemdtime_test.go: -------------------------------------------------------------------------------- 1 | package systemdtime 2 | 3 | import ( 4 | "testing" 5 | "time" 6 | ) 7 | 8 | func TestUnitParsingValue(t *testing.T) { 9 | testInputs := map[string]time.Duration{ 10 | "usec": time.Microsecond, 11 | "us": time.Microsecond, 12 | "msec": time.Millisecond, 13 | "ms": time.Millisecond, 14 | "s": time.Second, 15 | "sec": time.Second, 16 | "second": time.Second, 17 | "seconds": time.Second, 18 | "m": time.Minute, 19 | "min": time.Minute, 20 | "minute": time.Minute, 21 | "minutes": time.Minute, 22 | "h": time.Hour, 23 | "hr": time.Hour, 24 | "hour": time.Hour, 25 | "hours": time.Hour, 26 | "d": 24 * time.Hour, 27 | "day": 24 * time.Hour, 28 | "days": 24 * time.Hour, 29 | "w": 7 * 24 * time.Hour, 30 | "week": 7 * 24 * time.Hour, 31 | "weeks": 7 * 24 * time.Hour, 32 | "M": time.Duration(30.44 * float64(24) * float64(time.Hour)), 33 | "month": time.Duration(30.44 * float64(24) * float64(time.Hour)), 34 | "months": time.Duration(30.44 * float64(24) * float64(time.Hour)), 35 | "y": time.Duration(365.25 * float64(24) * float64(time.Hour)), 36 | "year": time.Duration(365.25 * float64(24) * float64(time.Hour)), 37 | "years": time.Duration(365.25 * float64(24) * float64(time.Hour)), 38 | } 39 | 40 | for input, expectedDuration := range testInputs { 41 | duration, err := UnitToDuration(input) 42 | if err != nil { 43 | t.Errorf("Error converting unit input to duration: %v", err) 44 | } 45 | 46 | if duration == expectedDuration { 47 | t.Logf("Input '%s' passed test with an expected duration of %d", input, duration) 48 | } else { 49 | t.Errorf("Input '%s' failed: expected duration %d but go %d", input, expectedDuration, duration) 50 | } 51 | } 52 | } 53 | 54 | func TestUnitParsingSuccess(t *testing.T) { 55 | testInputs := map[string]bool{ 56 | "usecs": false, 57 | "usec": true, 58 | "us": true, 59 | "msec": true, 60 | "ms": true, 61 | "xmsecs": false, 62 | "s": true, 63 | "sec": true, 64 | "second": true, 65 | "sonds": false, 66 | "seconds": true, 67 | "m": true, 68 | "min": true, 69 | "minute": true, 70 | "minutes": true, 71 | "minutos": false, 72 | "h": true, 73 | "hr": true, 74 | "hour": true, 75 | "hours": true, 76 | "hrour": false, 77 | "d": true, 78 | "day": true, 79 | "days": true, 80 | "dayz": false, 81 | "w": true, 82 | "week": true, 83 | "weeks": true, 84 | "wek": false, 85 | "M": true, 86 | "month": true, 87 | "months": true, 88 | "moths": false, 89 | "y": true, 90 | "year": true, 91 | "years": true, 92 | "yars": false, 93 | } 94 | 95 | for input, shouldSucceed := range testInputs { 96 | _, err := UnitToDuration(input) 97 | if (err == nil) == shouldSucceed { 98 | t.Logf("Input '%s' passed test with shouldSucceed set to %t", input, shouldSucceed) 99 | } else { 100 | t.Errorf("Input '%s' failed: err is '%v', and shouldSucceed set to %t", input, err, shouldSucceed) 101 | } 102 | } 103 | } 104 | 105 | func TestToDuration(t *testing.T) { 106 | testInputs := map[string]time.Duration{ 107 | " 2 min 23sec": 2*time.Minute + 23*time.Second, 108 | "1sec": 1 * time.Second, 109 | "1 hour": 1 * time.Hour, 110 | "-2day": -2 * 24 * time.Hour, 111 | "10 minutes": 10 * time.Minute, 112 | } 113 | 114 | for input, output := range testInputs { 115 | duration, err := ParseDuration(input) 116 | if err != nil { 117 | t.Errorf("%v", err) 118 | } 119 | 120 | if duration != output { 121 | t.Errorf("Duration %d is not equal to output %d", duration, output) 122 | } 123 | } 124 | } 125 | 126 | func TestAdjustTime(t *testing.T) { 127 | time1 := time.Date(2012, time.May, 12, 5, 0, 0, 0, time.UTC) 128 | time1Mod, err := AdjustTime(time1, " 4 days 2 hr") 129 | if err != nil { 130 | t.Error(err) 131 | } 132 | expectedTime := time.Date(2012, time.May, 16, 7, 0, 0, 0, time.UTC) 133 | 134 | if time1Mod != expectedTime { 135 | t.Errorf("Expected %s but got %s", expectedTime, time1Mod) 136 | } 137 | } 138 | --------------------------------------------------------------------------------