From f3231b52c4a7c2d9c4db79686ab7a7495caa33e1 Mon Sep 17 00:00:00 2001
From: Artemy Egorov <artegoser@gmail.com>
Date: Wed, 7 Aug 2024 15:13:16 +0300
Subject: [PATCH] feat: meta tag, resolve title

---
 Cargo.lock                  |  2 +-
 Cargo.toml                  |  2 +-
 src/daletl.rs               |  3 ++-
 src/traits/from_daletl.rs   |  3 ++-
 src/traits/mod.rs           |  1 +
 src/traits/resolve_title.rs | 37 +++++++++++++++++++++++++++++++++++++
 src/traits/to_daletl.rs     |  3 ++-
 src/typed.rs                |  7 ++++++-
 8 files changed, 52 insertions(+), 6 deletions(-)
 create mode 100644 src/traits/resolve_title.rs

diff --git a/Cargo.lock b/Cargo.lock
index 18bc624..c51b0cc 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -151,7 +151,7 @@ dependencies = [
 
 [[package]]
 name = "dalet"
-version = "1.0.0-pre.12"
+version = "1.0.0-pre.13"
 dependencies = [
  "bincode",
  "clap",
diff --git a/Cargo.toml b/Cargo.toml
index c157272..ad01074 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "dalet"
-version = "1.0.0-pre.12"
+version = "1.0.0-pre.13"
 edition = "2021"
 authors = ["artegoser"]
 license = "MIT"
diff --git a/src/daletl.rs b/src/daletl.rs
index 42ae55b..df0ebd6 100644
--- a/src/daletl.rs
+++ b/src/daletl.rs
@@ -73,10 +73,11 @@ pub enum DlTid {
     Sup,
     Sub,
     Disc,
-    Bl,
+    Block,
     Carousel,
     Code,
     Pre,
+    Meta,
 }
 
 pub trait IsNull {
diff --git a/src/traits/from_daletl.rs b/src/traits/from_daletl.rs
index 6877d9e..0aec2cd 100644
--- a/src/traits/from_daletl.rs
+++ b/src/traits/from_daletl.rs
@@ -37,10 +37,11 @@ impl TryFrom<DlTag> for Tag {
             DlTid::Sup => Sup(tag.body.try_into()?),
             DlTid::Sub => Sub(tag.body.try_into()?),
             DlTid::Disc => Disc(tag.body.try_into()?),
-            DlTid::Bl => Bl(tag.body.try_into()?, tag.argument.try_into()?),
+            DlTid::Block => Block(tag.body.try_into()?, tag.argument.try_into()?),
             DlTid::Carousel => Carousel(tag.body.try_into()?),
             DlTid::Code => Code(tag.body.try_into()?, tag.argument.try_into()?),
             DlTid::Pre => Pre(tag.body.try_into()?),
+            DlTid::Meta => Meta(tag.body.try_into()?, tag.argument.try_into()?),
         };
 
         Ok(result)
diff --git a/src/traits/mod.rs b/src/traits/mod.rs
index 23dd098..9ed6a88 100644
--- a/src/traits/mod.rs
+++ b/src/traits/mod.rs
@@ -1,3 +1,4 @@
 mod from_daletl;
 mod is_null_daletl;
+mod resolve_title;
 mod to_daletl;
diff --git a/src/traits/resolve_title.rs b/src/traits/resolve_title.rs
new file mode 100644
index 0000000..a4093f7
--- /dev/null
+++ b/src/traits/resolve_title.rs
@@ -0,0 +1,37 @@
+use crate::typed::{
+    Hl, NNBody, Page, ResolveTitle,
+    Tag::{self, Block, Meta, H},
+};
+
+impl ResolveTitle for Page {
+    fn resolve_title(&self) -> Option<&String> {
+        resolve_from_tags(&self.data)
+    }
+}
+
+fn resolve_from_tags(tags: &Vec<Tag>) -> Option<&String> {
+    for tag in tags {
+        match tag {
+            H(title, level) => {
+                if *level == Hl::One {
+                    return Some(title);
+                }
+            }
+
+            Meta(body, key) => {
+                if key == "title" {
+                    return Some(body);
+                }
+            }
+
+            Block(body, _) => match body {
+                NNBody::Tags(tags) => return resolve_from_tags(tags),
+                _ => {}
+            },
+
+            _ => {}
+        };
+    }
+
+    None
+}
diff --git a/src/traits/to_daletl.rs b/src/traits/to_daletl.rs
index f152a9e..089b1aa 100644
--- a/src/traits/to_daletl.rs
+++ b/src/traits/to_daletl.rs
@@ -32,10 +32,11 @@ impl From<Tag> for DlTag {
             Tag::Sup(b) => dlt_new(DlTid::Sup, b.into(), NA),
             Tag::Sub(b) => dlt_new(DlTid::Sub, b.into(), NA),
             Tag::Disc(b) => dlt_new(DlTid::Disc, b.into(), NA),
-            Tag::Bl(b, a) => dlt_new(DlTid::Bl, b.into(), a.into()),
+            Tag::Block(b, a) => dlt_new(DlTid::Block, b.into(), a.into()),
             Tag::Carousel(b) => dlt_new(DlTid::Carousel, b.into(), NA),
             Tag::Code(b, a) => dlt_new(DlTid::Code, b.into(), a.into()),
             Tag::Pre(b) => dlt_new(DlTid::Pre, b.into(), NA),
+            Tag::Meta(b, a) => dlt_new(DlTid::Meta, b.into(), a.into()),
         }
     }
 }
diff --git a/src/typed.rs b/src/typed.rs
index eff65ef..d03732d 100644
--- a/src/typed.rs
+++ b/src/typed.rs
@@ -42,10 +42,11 @@ pub enum Tag {
     Sup(TBody),
     Sub(TBody),
     Disc(NNBody),
-    Bl(NNBody, AlignArg),
+    Block(NNBody, AlignArg),
     Carousel(Vec<Tag>),
     Code(TBody, TNArg),
     Pre(TBody),
+    Meta(TBody, TArg),
 }
 
 #[derive(AutoFrom, Debug, Clone, PartialEq, Eq)]
@@ -106,3 +107,7 @@ pub enum Hl {
     Five,
     Six,
 }
+
+pub trait ResolveTitle {
+    fn resolve_title(&self) -> Option<&String>;
+}