feat: add pdf preview with pdftoppm (#18)

core/src/external/mod.rs

@@ -5,6 +5,7 @@ mod file;
 mod fzf;
 mod jq;
 mod lsar;
+mod pdftoppm;
 mod rg;
 mod unar;
 mod zoxide;
@@ -16,6 +17,7 @@ pub use file::*;
 pub use fzf::*;
 pub use jq::*;
 pub use lsar::*;
+pub use pdftoppm::*;
 pub use rg::*;
 pub use unar::*;
 pub use zoxide::*;

core/src/external/pdftoppm.rs

@@ -0,0 +1,22 @@
+use std::path::Path;
+
+use anyhow::{bail, Result};
+use tokio::process::Command;
+
+pub async fn pdftoppm(path: &Path, dest: &Path) -> Result<()> {
+    let output = Command::new("pdftoppm")
+        .args(["-png", "-singlefile"])
+        .arg(path)
+        .arg(dest)
+        .kill_on_drop(true)
+        .output()
+        .await?;
+
+    if !output.status.success() {
+        bail!(
+            "failed to get pdf: {}",
+            String::from_utf8_lossy(&output.stderr)
+        );
+    }
+    Ok(())
+}

core/src/manager/preview.rs

@@ -63,6 +63,7 @@ impl Preview {
 				MimeKind::JSON => Self::json(&path).await.map(PreviewData::Text),
 				MimeKind::Text => Self::highlight(&path).await.map(PreviewData::Text),
 				MimeKind::Image => Self::image(&path).await,
+				MimeKind::Pdf => Self::pdf(&path).await,
 				MimeKind::Video => Self::video(&path).await,
 				MimeKind::Archive => Self::archive(&path).await.map(PreviewData::Text),
 				MimeKind::Others => Err(anyhow!("Unsupported mimetype: {mime}")),
@@ -117,6 +118,19 @@ impl Preview {
 		Self::image(&cache).await
 	}
 
+    pub async fn pdf(path: &Path) -> Result<PreviewData> {
+		let cache = Image::cache(path);
+		if fs::metadata(&cache).await.is_err() {
+			external::pdftoppm(path, &cache).await?;
+		}
+
+        let mut dest = cache.into_os_string();
+        dest.push(".png");
+
+        let dest = Path::new(&dest);
+		Self::image(dest).await
+	}
+
 	pub async fn json(path: &Path) -> Result<String> {
 		Ok(
 			external::jq(path)

shared/src/mime.rs

@@ -7,6 +7,7 @@ pub enum MimeKind {
 	Text,
 	Image,
 	Video,
+    Pdf,
 	Archive,
 	Others,
 }
@@ -27,6 +28,7 @@ impl MimeKind {
 			"message" => true,
 			"model" => true,
 			"multipart" => true,
+            "pdf" => true,
 			"text" => true,
 			"video" => true,
 			_ => false,
@@ -39,6 +41,8 @@ impl MimeKind {
 			Self::Dir
 		} else if s == "application/json" {
 			Self::JSON
+		} else if s == "application/pdf" {
+			Self::Pdf
 		} else if s.starts_with("text/") || s.ends_with("/xml") {
 			Self::Text
 		} else if s.starts_with("image/") {