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[WIP] docs: update hacker news tutorial #49

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a3f7c6d
feat: initial update for tutorial
lanjoni Dec 16, 2024
d648a41
feat: update base tutorial code
lanjoni Dec 16, 2024
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34 changes: 22 additions & 12 deletions docs/tutorials/hacker-news-scraper.mdx
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Original file line number Diff line number Diff line change
Expand Up @@ -111,7 +111,7 @@ you follow along in your REPL:
(->> sample-html
(hc/parse)
(hc/as-hickory)
(hs/select (hs/class "itemlist"))
(hs/select (hs/id "hnmain"))
first))
```

Expand All @@ -130,7 +130,7 @@ This is how we can do it with Hickory:
(->> sample-html
(hc/parse)
(hc/as-hickory)
(hs/select (hs/class "itemlist"))
(hs/select (hs/id "hnmain"))
first
(hs/select (hs/and
(hs/tag "tr")
Expand Down Expand Up @@ -193,9 +193,9 @@ Here is a function to extract the data points we mentioned at start from each it
:hacker-news.item/id (->> el :content first :attrs :id)
:hacker-news.item/rank-in-page (select-number (class-text el "rank"))
:hacker-news.item/source (class-text el "sitestr")
:hacker-news.item/title (class-text el "titlelink")
:hacker-news.item/url (->> (hs/select (hs/class "titlelink") el)
first :attrs :href)})
:hacker-news.item/title (class-text el "titleline")
:hacker-news.item/url (->> (hs/select (hs/class "titleline") el)
first :content first :attrs :href)})
```

Let's use it to extract the data from our previous process:
Expand All @@ -205,7 +205,7 @@ Let's use it to extract the data from our previous process:
(->> sample-html
(hc/parse)
(hc/as-hickory)
(hs/select (hs/class "itemlist"))
(hs/select (hs/id "hnmain"))
first
(hs/select (hs/and
(hs/tag "tr")
Expand Down Expand Up @@ -267,9 +267,9 @@ Time to introduce Pathom, now I'm going to turn that exploration code in a resol
:hacker-news.item/id (->> el :content first :attrs :id)
:hacker-news.item/rank-in-page (select-number (class-text el "rank"))
:hacker-news.item/source (class-text el "sitestr")
:hacker-news.item/title (class-text el "storylink")
:hacker-news.item/url (->> (hs/select (hs/class "storylink") el)
first :attrs :href)})
:hacker-news.item/title (class-text el "titleline")
:hacker-news.item/url (->> (hs/select (hs/class "titleline") el)
first :content first :attrs :href)})

(pco/defresolver news-page-html-string []
{:hacker-news.page/news-raw-html
Expand All @@ -291,7 +291,7 @@ Time to introduce Pathom, now I'm going to turn that exploration code in a resol
(->> news-raw-html
(hc/parse)
(hc/as-hickory)
(hs/select (hs/class "itemlist"))
(hs/select (hs/id "hnmain"))
first
(hs/select (hs/and
(hs/tag "tr")
Expand Down Expand Up @@ -428,7 +428,7 @@ by breaking this step into a new resolver.
:hacker-news.item/url]}]}
{:hacker-news.page/news
(->> news-hickory
(hs/select (hs/class "itemlist"))
(hs/select (hs/id "hnmain"))
first
(hs/select (hs/and
(hs/tag "tr")
Expand Down Expand Up @@ -552,6 +552,16 @@ same process we did with the query before:
(tree-seq :hacker-news.page/news-next-page
(comp vector :hacker-news.page/news-next-page))
(into [] (mapcat :hacker-news.page/news)))})

; remember to update env to include all resolvers
(def env
(-> {::durable-cache* cache*}
(pci/register
[news-page-html-string
news-page-hickory
news-page
news-next-page
all-news-pages])))
```

Now we can, for example, make this query to read all titles in news, in all pages:
Expand Down Expand Up @@ -1024,7 +1034,7 @@ parse it, as we did for comments and user details.
```clojure
(defn extract-items-from-list [hickory]
(let [tbody (->> hickory
(hs/select (hs/class "itemlist"))
(hs/select (hs/id "hnmain"))
first
(hs/select (hs/tag "tbody"))
first)
Expand Down
10 changes: 5 additions & 5 deletions src/main/com/wsscode/pathom3/docs/demos/tutorials/hacker_news_scrapper.clj
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Original file line number Diff line number Diff line change
Expand Up @@ -50,9 +50,9 @@
:hacker-news.item/id (->> el :content first :attrs :id)
:hacker-news.item/rank-in-page (select-number (class-text el "rank"))
:hacker-news.item/source (class-text el "sitestr")
:hacker-news.item/title (class-text el "storylink")
:hacker-news.item/url (->> (hs/select (hs/class "storylink") el)
first :attrs :href)})
:hacker-news.item/title (class-text el "titleline")
:hacker-news.item/url (->> (hs/select (hs/class "titleline") el)
first :content first :attrs :href)})

; endregion

Expand Down Expand Up @@ -84,7 +84,7 @@
:hacker-news.item/url]}]}
{:hacker-news.page/news
(->> news-hickory
(hs/select (hs/class "itemlist"))
(hs/select (hs/id "hnmain"))
first
(hs/select (hs/and
(hs/tag "tr")
Expand Down Expand Up @@ -176,7 +176,7 @@

(defn extract-items-from-list [hickory]
(let [tbody (->> hickory
(hs/select (hs/class "itemlist"))
(hs/select (hs/id "hnmain"))
first
(hs/select (hs/tag "tbody"))
first)
Expand Down