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| author | Thomas White <taw@physics.org> | 2022-07-10 14:57:12 +0200 |
|---|---|---|
| committer | Thomas White <taw@physics.org> | 2022-07-10 14:57:12 +0200 |
| commit | 3731f442ca40619ce7e62789e6b8c44571866e74 (patch) | |
| tree | aced5aa1cb99e26c2a979455b72cca7aab2065ad | |
| parent | 274ebcd3c7a87524513f845cf533bd5b4d53ee16 (diff) | |
Add "state-empty?"
| -rw-r--r-- | guile/starlet/state.scm | 8 | ||||
| -rw-r--r-- | guile/starlet/utils.scm | 14 |
2 files changed, 20 insertions, 2 deletions
diff --git a/guile/starlet/state.scm b/guile/starlet/state.scm index 0fff383..0047014 100644 --- a/guile/starlet/state.scm +++ b/guile/starlet/state.scm @@ -57,7 +57,8 @@ value->number atomically-overlay-state! update-state! - add-update-hook!)) + add-update-hook! + state-empty?)) ;; A "state" is an atomically-updating container for an immutable @@ -452,3 +453,8 @@ pre-existing contents." (set! selection (flatten-sublists fixture-list)))) (run-hook selection-hook selection)) + +(define (state-empty? st) + (hash-table-empty? + (atomic-box-ref + (get-ht-box st)))) diff --git a/guile/starlet/utils.scm b/guile/starlet/utils.scm index 7656827..4a2f0be 100644 --- a/guile/starlet/utils.scm +++ b/guile/starlet/utils.scm @@ -22,6 +22,7 @@ #:use-module (srfi srfi-1) #:use-module (srfi srfi-8) #:use-module (ice-9 exceptions) + #:use-module (ice-9 control) #:export (print-hash-table copy-hash-table in-range @@ -38,7 +39,8 @@ scale-and-clamp-to-range percent->dmxval8 percent->dmxval16 - comment)) + comment + hash-table-empty?)) (define (print-hash-table ht) @@ -166,3 +168,13 @@ (syntax-rules () ((_ body ...) #f))) + + +(define (hash-table-empty? ht) + (let/ec + return + (hash-for-each-handle + (lambda (key) + (return #f)) + ht) + #t)) |