I'm writing a website using clojure hiccup for html and clojure garden for css. Now I'm having trouble using clojure.string/split to split a path for the filename. So for some/path/file.md I want file.
For context here's the code snippet, where the problem is
(defn blog-card [post]
[:a.blog-post-card-link {:href (->> (:location post)
(string/split #"/")
last
(string/replace ".md" ""))}
[:div.blog-post-card
-- rest of content -- ]])
now this function gets called here
(defn blog-content []
[:div.blog-content
[:div.blog-post-cards-list
(let [json-str (slurp "resources/public/markdown/posts/all-posts.json")
posts (json/parse-string json-str true)]
(map blog-card (reverse posts)))]])
where json is [cheshire.core :as json] and string is [clojure.string :as string]. The all-posts.json looks like this
[
{
"id": "0",
"title": "Test article #1",
"description": "This article is just a place-filler for development.",
"image": "images/mountain.jpg",
"date": "10 Oct 2023",
"author": "Elías Hauksson",
"location": "markdown/posts/test-post01.md"
},
-- more test entries --
]
So with this example, what I'd like to achieve is, that when the card is pressed, one gets redirected to /test-post01
Now when I try to run this code I get the following error message
HTTP ERROR 500 java.lang.ClassCastException: class java.lang.String cannot be cast to class java.util.regex.Pattern (java.lang.String and java.util.regex.Pattern are in module java.base of loader 'bootstrap')
URI: /blog
STATUS: 500
MESSAGE: java.lang.ClassCastException: class java.lang.String cannot be cast to class java.util.regex.Pattern (java.lang.String and java.util.regex.Pattern are in module java.base of loader 'bootstrap')
SERVLET: -
CAUSED BY: java.lang.ClassCastException: class java.lang.String cannot be cast to class java.util.regex.Pattern (java.lang.String and java.util.regex.Pattern are in module java.base of loader 'bootstrap')
Caused by:
java.lang.ClassCastException: class java.lang.String cannot be cast to class java.util.regex.Pattern (java.lang.String and java.util.regex.Pattern are in module java.base of loader 'bootstrap')
at clojure.string$split.invokeStatic(string.clj:219)
at clojure.string$split.invoke(string.clj:219)
at eliashaukssoncom.views.blog$blog_card.invokeStatic(blog.clj:10)
at eliashaukssoncom.views.blog$blog_card.invoke(blog.clj:8)
at clojure.core$map$fn__5935.invoke(core.clj:2772)
at clojure.lang.LazySeq.sval(LazySeq.java:42)
at clojure.lang.LazySeq.seq(LazySeq.java:51)
at clojure.lang.RT.seq(RT.java:535)
at clojure.core$seq__5467.invokeStatic(core.clj:139)
at clojure.core$map$fn__5935.invoke(core.clj:2763)
at clojure.lang.LazySeq.sval(LazySeq.java:42)
at clojure.lang.LazySeq.seq(LazySeq.java:51)
at clojure.lang.RT.seq(RT.java:535)
at clojure.core$seq__5467.invokeStatic(core.clj:139)
at clojure.core$apply.invokeStatic(core.clj:662)
at clojure.core$apply.invoke(core.clj:662)
at hiccup.compiler$fn__3080.invokeStatic(compiler.clj:139)
at hiccup.compiler$fn__3080.invoke(compiler.clj:133)
at hiccup.compiler$fn__3063$G__3058__3068.invoke(compiler.clj:119)
at clojure.core$map$fn__5935.invoke(core.clj:2770)
at clojure.lang.LazySeq.sval(LazySeq.java:42)
at clojure.lang.LazySeq.seq(LazySeq.java:51)
at clojure.lang.RT.seq(RT.java:535)
at clojure.core$seq__5467.invokeStatic(core.clj:139)
at clojure.core$apply.invokeStatic(core.clj:662)
at clojure.core$apply.invoke(core.clj:662)
at hiccup.compiler$fn__3080.invokeStatic(compiler.clj:139)
at hiccup.compiler$fn__3080.invoke(compiler.clj:133)
at hiccup.compiler$fn__3063$G__3058__3068.invoke(compiler.clj:119)
at hiccup.compiler$render_element.invokeStatic(compiler.clj:129)
at hiccup.compiler$render_element.invoke(compiler.clj:123)
at hiccup.compiler$fn__3078.invokeStatic(compiler.clj:136)
at hiccup.compiler$fn__3078.invoke(compiler.clj:133)
at hiccup.compiler$fn__3063$G__3058__3068.invoke(compiler.clj:119)
at clojure.core$map$fn__5935.invoke(core.clj:2770)
at clojure.lang.LazySeq.sval(LazySeq.java:42)
at clojure.lang.LazySeq.seq(LazySeq.java:51)
at clojure.lang.RT.seq(RT.java:535)
at clojure.core$seq__5467.invokeStatic(core.clj:139)
at clojure.core$apply.invokeStatic(core.clj:662)
at clojure.core$apply.invoke(core.clj:662)
at hiccup.compiler$fn__3080.invokeStatic(compiler.clj:139)
at hiccup.compiler$fn__3080.invoke(compiler.clj:133)
at hiccup.compiler$fn__3063$G__3058__3068.invoke(compiler.clj:119)
at hiccup.compiler$render_element.invokeStatic(compiler.clj:129)
at hiccup.compiler$render_element.invoke(compiler.clj:123)
at hiccup.compiler$fn__3078.invokeStatic(compiler.clj:136)
at hiccup.compiler$fn__3078.invoke(compiler.clj:133)
at hiccup.compiler$fn__3063$G__3058__3068.invoke(compiler.clj:119)
at eliashaukssoncom.views.base$base$fn__1001.invoke(base.clj:26)
at eliashaukssoncom.views.base$base.invokeStatic(base.clj:26)
at eliashaukssoncom.views.base$base.invoke(base.clj:25)
at eliashaukssoncom.views.blog$blog_page.invokeStatic(blog.clj:35)
at eliashaukssoncom.views.blog$blog_page.invoke(blog.clj:34)
at eliashaukssoncom.handler$fn__1026.invokeStatic(handler.clj:13)
at eliashaukssoncom.handler$fn__1026.invoke(handler.clj:13)
at compojure.core$wrap_response$fn__2214.invoke(core.clj:158)
at compojure.core$wrap_route_middleware$fn__2198.invoke(core.clj:128)
at compojure.core$wrap_route_info$fn__2203.invoke(core.clj:137)
at compojure.core$wrap_route_matches$fn__2207.invoke(core.clj:146)
at compojure.core$routing$fn__2222.invoke(core.clj:185)
at clojure.core$some.invokeStatic(core.clj:2718)
at clojure.core$some.invoke(core.clj:2709)
at compojure.core$routing.invokeStatic(core.clj:185)
at compojure.core$routing.doInvoke(core.clj:182)
at clojure.lang.RestFn.applyTo(RestFn.java:139)
at clojure.core$apply.invokeStatic(core.clj:669)
at clojure.core$apply.invoke(core.clj:662)
at compojure.core$routes$fn__2226.invoke(core.clj:192)
at ring.middleware.resource$wrap_resource_prefer_resources$fn__596.invoke(resource.clj:25)
at clojure.lang.Var.invoke(Var.java:384)
at ring.adapter.jetty$proxy_handler$fn__420.invoke(jetty.clj:27)
at ring.adapter.jetty.proxy$org.eclipse.jetty.server.handler.AbstractHandler$ff19274a.handle(Unknown Source)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
at org.eclipse.jetty.server.Server.handle(Server.java:516)
at org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:487)
at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:732)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:479)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:277)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:105)
at org.eclipse.jetty.io.ChannelEndPoint$1.run(ChannelEndPoint.java:104)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:883)
at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1034)
at java.base/java.lang.Thread.run(Thread.java:829)
(:location post) with "some/test/path/file.md"->> operator. Like this{:href (string/replace (last (string/split (:location post) #"/")) #".md" "")}
Edit: Point 2 turns out to be the correct solution (as mentioned by @Eugene_Pakhomov), it was a typo in my code that didn't make it work the first time.
Thank you in advance for your suggestions.
clojure.string/split accepts a string as the first argument and a regular expression as the second. The code in the "What I've tried" section should work. The code in the main section doesn't work because (->> (:location post) (string/split #"/")) is expanded into (string/split #"/" (:location post)).