feat: implement cbz writing and pdf reading

src/formats/mod.rs

@@ -8,6 +8,9 @@ use crate::model::Document;
 pub mod cbz;
 pub mod pdf;
 
+use cbz::{CbzReader, CbzWriter};
+use pdf::{PdfReader, PdfWriter};
+
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub enum FormatId {
     Cbz,
@@ -17,18 +20,12 @@ pub enum FormatId {
 impl FormatId {
     #[allow(dead_code)]
     pub fn can_read(self) -> bool {
-        match self {
-            FormatId::Cbz => true,
-            FormatId::Pdf => false, // planned but not implemented yet
-        }
+        get_reader(self).is_some()
     }
 
     #[allow(dead_code)]
     pub fn can_write(self) -> bool {
-        match self {
-            FormatId::Pdf => true,
-            FormatId::Cbz => false, // planned but not implemented yet
-        }
+        get_writer(self).is_some()
     }
 
     pub fn detect_from_path(path: &Path) -> Option<FormatId> {
@@ -47,3 +44,17 @@ pub trait FormatReader: Send + Sync {
 pub trait FormatWriter: Send + Sync {
     fn write(&self, doc: &Document, output: &Path) -> Result<()>;
 }
+
+pub fn get_reader(format: FormatId) -> Option<Box<dyn FormatReader>> {
+    match format {
+        FormatId::Cbz => Some(Box::new(CbzReader)),
+        FormatId::Pdf => Some(Box::new(PdfReader)),
+    }
+}
+
+pub fn get_writer(format: FormatId) -> Option<Box<dyn FormatWriter>> {
+    match format {
+        FormatId::Pdf => Some(Box::new(PdfWriter)),
+        FormatId::Cbz => Some(Box::new(CbzWriter)),
+    }
+}