Very bad take on a list of recently updated chapters

Cargo.lock

@@ -209,14 +209,16 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
 [[package]]
 name = "chrono"
-version = "0.4.26"
+version = "0.4.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ec837a71355b28f6556dbd569b37b3f363091c0bd4b2e735674521b4c5fd9bc5"
+checksum = "7f2c685bad3eb3d45a01354cedb7d5faa66194d1d58ba6e267a8de788f79db38"
 dependencies = [
  "android-tzdata",
  "iana-time-zone",
+ "js-sys",
  "num-traits",
- "winapi",
+ "wasm-bindgen",
+ "windows-targets 0.48.1",
 ]
 
 [[package]]
@@ -263,6 +265,12 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "acbf1af155f9b9ef647e42cdc158db4b64a1b61f743629225fde6f3e0be2a7c7"
 
+[[package]]
+name = "concat-string"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7439becb5fafc780b6f4de382b1a7a3e70234afe783854a4702ee8adbb838609"
+
 [[package]]
 name = "core-foundation-sys"
 version = "0.8.4"
@@ -898,7 +906,9 @@ dependencies = [
 name = "mdbook-last-changed"
 version = "0.1.4"
 dependencies = [
+ "chrono",
  "clap",
+ "concat-string",
  "env_logger",
  "log",
  "mdbook",

Cargo.toml

@@ -15,3 +15,5 @@ clap = { version = "4.0.29", features = ["cargo"] }
 serde_json = "1.0"
 toml = "0.5.11"
 xshell = "0.2.2"
+chrono = "0.4.31"
+concat-string = "1.0.1"

src/lib.rs

@@ -1,5 +1,9 @@
+use std::collections::HashMap;
 use std::path::{Path, PathBuf};
+use std::str::FromStr;
 
+use chrono::NaiveDate;
+use concat_string::concat_string;
 use mdbook::book::{Book, BookItem, Chapter};
 use mdbook::errors::Result;
 use mdbook::preprocess::{Preprocessor, PreprocessorContext};
@@ -7,6 +11,12 @@ use xshell::{cmd, Shell};
 
 pub struct LastChanged;
 
+#[derive(Debug, Eq, PartialEq, Hash)]
+struct LiteLink {
+    name: String,
+    path: Option<PathBuf>,
+}
+
 impl Preprocessor for LastChanged {
     fn name(&self) -> &str {
         "last-changed"
@@ -43,6 +53,7 @@ impl Preprocessor for LastChanged {
             None => None,
         };
 
+        let mut map: HashMap<LiteLink, String> = HashMap::new();
         let mut res = None;
         book.for_each_mut(|item: &mut BookItem| {
             if let Some(Err(_)) = res {
@@ -52,13 +63,53 @@ impl Preprocessor for LastChanged {
 
             if let BookItem::Chapter(ref mut chapter) = *item {
                 res = Some(
-                    last_changed(&git_root, &src_root, repository_string, chapter).map(|md| {
+                    last_changed(&git_root, &src_root, repository_string, chapter, &mut map).map(
+                        |md| {
                             chapter.content = md;
-                    }),
+                        },
+                    ),
                 );
             }
         });
 
+        let mut vec: Vec<(LiteLink, NaiveDate)> = map
+            .into_iter()
+            .map(|e| (e.0, NaiveDate::from_str(&e.1).unwrap()))
+            .collect();
+        // Sorting alphabetically and then by date, this means same date entries will be sorted alphabetically, otherwise the end result will be randomized when truncating
+        vec.sort_by(|a, b| a.0.name.cmp(&b.0.name));
+        vec.sort_by(|a, b| b.1.cmp(&a.1));
+        vec.truncate(5);
+
+        let text: String = vec
+            .into_iter()
+            .map(|f| {
+                format!(
+                    "<li><a href=\"{}\">{}</a></li>",
+                    f.0.path.unwrap().display(),
+                    f.0.name
+                )
+            })
+            .collect();
+        let text = concat_string!("## Recently Updated:\n", "<ul>", text, "</ul>");
+
+        book.for_each_mut(|item: &mut BookItem| {
+            if let Some(Err(_)) = res {
+                log::trace!("Error when changing the book. Last result: {res:?}");
+                return;
+            }
+
+            if let BookItem::Chapter(ref mut chapter) = *item {
+                if let Some(ch) = &chapter.number {
+                    if ch.0[0] == 1 {
+                        // let content = &chapter.content;
+                        // chapter.content = format!("{}\n{}", text, content);
+                        chapter.content = chapter.content.replace("⁂⁂⁂", &text);
+                    }
+                }
+            }
+        });
+
         res.unwrap_or(Ok(())).map(|_| book)
     }
 }
@@ -68,6 +119,7 @@ fn last_changed(
     src_root: &Path,
     base_url: Option<&str>,
     chapter: &mut Chapter,
+    map: &mut HashMap<LiteLink, String>,
 ) -> Result<String> {
     let content = &chapter.content;
 
@@ -95,7 +147,13 @@ fn last_changed(
 
     let modification = get_last_modification(git_root, &path);
     let text = match modification {
-        Ok((date, commit)) => match base_url {
+        Ok((date, commit)) => {
+            let lite_link = LiteLink {
+                name: chapter.name.clone(),
+                path: chapter.path.clone(),
+            };
+            map.insert(lite_link, date.clone());
+            match base_url {
                 Some(url) => {
                     let url = format!("{}/commit/{}", url, commit);
                     format!(
@@ -106,7 +164,8 @@ fn last_changed(
                 None => {
                     format!("Last change: {}", date)
                 }
-        },
+            }
+        }
         Err(e) => {
             log::trace!("No modification found for {path:?}. Error: {e:?}");
             return Ok(content.into());