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| author | Hugo Hörnquist <hugo@lysator.liu.se> | 2019-03-20 21:39:44 +0100 |
|---|---|---|
| committer | Hugo Hörnquist <hugo@lysator.liu.se> | 2019-03-21 01:53:21 +0100 |
| commit | ed287bf2e7c171fc74796af541316342d55a6e3b (patch) | |
| tree | bebaf0e30dfc135224f24649c62b95d5e3b98591 /srfi | |
| parent | Fix crash when day has 0 events. (diff) | |
| download | calp-ed287bf2e7c171fc74796af541316342d55a6e3b.tar.gz calp-ed287bf2e7c171fc74796af541316342d55a6e3b.tar.xz | |
Move time procedures from main to where they belong.
Diffstat (limited to 'srfi')
| -rw-r--r-- | srfi/srfi-19/util.scm | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/srfi/srfi-19/util.scm b/srfi/srfi-19/util.scm index 2ec7140d..f1346f78 100644 --- a/srfi/srfi-19/util.scm +++ b/srfi/srfi-19/util.scm @@ -56,3 +56,28 @@ attribute set to 0. Can also be seen as \"Start of day\"" (define (remove-day time) (add-duration time (make-time time-duration 0 (- (* 60 60 24))))) + +;; A B C D ¬E +;; |s1| : |s2| : |s1| : |s2| : |s1| +;; | | : | | : | ||s2| : |s1|| | : | | +;; | ||s2| : |s1|| | : | || | : | || | : +;; | | : | | : | || | : | || | : |s2| +;; | | : | | : | | : | | : | | +(define-public (timespan-overlaps? s1-begin s1-end s2-begin s2-end) + "Return whetever or not two timespans overlap." + (or + ;; A + (and (time<=? s2-begin s1-end) + (time<=? s1-begin s2-end)) + + ;; B + (and (time<=? s1-begin s2-end) + (time<=? s2-begin s1-end)) + + ;; C + (and (time<=? s1-begin s2-begin) + (time<=? s2-end s1-end)) + + ;; D + (and (time<=? s2-begin s1-begin) + (time<=? s1-end s2-end)))) |