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Tweak how cache digest is generated #57

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Merged
hlship merged 1 commit into from
Oct 24, 2025
Merged

Tweak how cache digest is generated #57

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25 changes: 14 additions & 11 deletions src/net/lewisship/cli_tools/cache.cljc
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Original file line number Diff line number Diff line change
Expand Up @@ -8,21 +8,20 @@
[clojure.string :as str]
[clj-commons.ansi :refer [perr]]
#?(:bb [babashka.classpath :as cp]))
(:import [java.io File]
[java.security MessageDigest]))
(:import (java.io File)
(java.nio ByteBuffer)
(java.security MessageDigest)))

(defn- get-classpath
[]
#?(
:bb (cp/get-classpath)
#?(:bb (cp/get-classpath)
:clj (System/getProperty "java.class.path")))

(defn- get-split-classpath
[]
(let [sep fs/path-separator
paths (-> (get-classpath)
(str/split (re-pattern sep)))]

(->> paths
sort
(mapv io/file))))
Expand All @@ -34,16 +33,19 @@
(let [bytes (.getBytes value "UTF-8")]
(.update digest bytes)))

(defn- update-digest-from-file-contents
(defn- update-digest-from-file
[^MessageDigest digest f]
(let [f' (fs/file f)]
;; Would be better to digest the 8 raw bytes, but this is easier.
(update-digest-from-string digest (Long/toHexString (.lastModified f')))))
(let [f' (fs/file f)
last-modified (.lastModified f')
b (ByteBuffer/allocate 8)]
(.putLong b last-modified)
(.flip b)
(.update digest b)))

(defn- update-digest-recursively
[digest ^File root]
(let [paths (fs/glob root "**")]
(run! #(update-digest-from-file-contents digest %) paths)))
(run! #(update-digest-from-file digest %) paths)))

(defn- update-digest
[digest source]
Expand All @@ -52,7 +54,8 @@
;; The assumption is that files are .jar files and the name will change if
;; the contents change.
(update-digest-from-string digest (.getCanonicalPath f))
;; But for a source directory, find all the sources (and digest their contents).
;; But for a source directory, find all the sources (and digest their file time stamps).
;; Adding or removing a file (even if no other files are touched) will change the digest.
(update-digest-recursively digest f))))

(defn- hex-string [^bytes input]
Expand Down