preview fonts & svg by creating thumbnails

3 files changed, 69 insertions, 7 deletions

diff --git a/development.md b/development.md
index 681ec576..8fd144a7 100644
--- a/development.md
+++ b/development.md
@@ -486,8 +486,8 @@ New view: Tree ! Toggle with 't', fold with 'z'. Navigate normally.
   - [ ] edit folder like a buffer [oil like](https://github.com/stevearc/oil.nvim)
   - [ ] allow pipe in execution
   - [ ] search in preview or in help
-  - [ ] preview SVG like [ranger](https://github.com/ranger/ranger/pull/2537/files) does
-  - [ ] preview font with fontimage like [ranger](https://github.com/ranger/ranger/blob/46660c277c2ceb7c7c41ffce794d68f8f559030f/ranger/data/scope.sh#L207-L225)
+  - [x] preview SVG like [ranger](https://github.com/ranger/ranger/pull/2537/files) does
+  - [x] preview font with fontimage like [ranger](https://github.com/ranger/ranger/blob/46660c277c2ceb7c7c41ffce794d68f8f559030f/ranger/data/scope.sh#L207-L225)
   - [x] preview doc with pandoc or odt2txt [ranger](https://github.com/ranger/ranger/blob/46660c277c2ceb7c7c41ffce794d68f8f559030f/ranger/data/scope.sh#L84-L93)
   - [x] preview notebooks
 
diff --git a/readme.md b/readme.md
index 74d942a7..788341de 100644
--- a/readme.md
+++ b/readme.md
@@ -266,6 +266,8 @@ Most of the openers and tui applications are configurable from config files. Som
 - [isoinfo](https://command-not-found.com/isoinfo) allow the content preview of an iso file
 - [jupyter](https://jupyter.org/) preview jupyter notebooks by converting them to markdown
 - [pandoc](https://pandoc.org) preview open documents by converting them to markdown with pandoc
+- [fontimage](https://fontforge.org/docs/fontutils/fontimage.html) preview fonts by creating a thumbnail
+- [rsvg-convert](https://github.com/brion/librsvg) preview svg by creating a thumbnail
 
 ## Contribution
 
diff --git a/src/preview.rs b/src/preview.rs
index 2f89208a..7e6f68cd 100644
--- a/src/preview.rs
+++ b/src/preview.rs
@@ -86,6 +86,10 @@ impl Preview {
                 e if is_ext_video(e) => {
                     Ok(Self::Ueberzug(Ueberzug::video_thumbnail(&file_info.path)?))
                 }
+                e if is_ext_font(e) => {
+                    Ok(Self::Ueberzug(Ueberzug::font_thumbnail(&file_info.path)?))
+                }
+                e if is_ext_svg(e) => Ok(Self::Ueberzug(Ueberzug::svg_thumbnail(&file_info.path)?)),
                 e if is_ext_iso(e) => Ok(Self::Iso(Iso::new(&file_info.path)?)),
                 e if is_ext_notebook(e) => {
                     Ok(Self::notebook(&file_info.path)
@@ -562,16 +566,30 @@ impl Ueberzug {
         })
     }
 
-    fn video_thumbnail(video_path: &Path) -> Result<Self> {
-        Self::make_thumbnail(video_path)?;
-        Ok(Self {
+    fn thumbnail() -> Self {
+        Self {
             path: THUMBNAIL_PATH.to_owned(),
             filename: "thumbnail".to_owned(),
             ueberzug: ueberzug::Ueberzug::new(),
-        })
+        }
+    }
+
+    fn video_thumbnail(video_path: &Path) -> Result<Self> {
+        Self::make_video_thumbnail(video_path)?;
+        Ok(Self::thumbnail())
+    }
+
+    fn font_thumbnail(font_path: &Path) -> Result<Self> {
+        Self::make_font_thumbnail(font_path)?;
+        Ok(Self::thumbnail())
     }
 
-    fn make_thumbnail(video_path: &Path) -> Result<()> {
+    fn svg_thumbnail(svg_path: &Path) -> Result<Self> {
+        Self::make_svg_thumbnail(svg_path)?;
+        Ok(Self::thumbnail())
+    }
+
+    fn make_video_thumbnail(video_path: &Path) -> Result<()> {
         let path_str = video_path
             .to_str()
             .context("make_thumbnail: couldn't parse the path into a string")?;
@@ -597,6 +615,40 @@ impl Ueberzug {
         Ok(())
     }
 
+    fn make_font_thumbnail(font_path: &Path) -> Result<()> {
+        let path_str = font_path
+            .to_str()
+            .context("make_thumbnail: couldn't parse the path into a string")?;
+        let output = std::process::Command::new("fontimage")
+            .args(["-o", THUMBNAIL_PATH, path_str])
+            .output()?;
+        if !output.stderr.is_empty() {
+            info!(
+                "fontimage thumbnail output: {} {}",
+                String::from_utf8(output.stdout).unwrap_or_default(),
+                String::from_utf8(output.stderr).unwrap_or_default()
+            );
+        }
+        Ok(())
+    }
+
+    fn make_svg_thumbnail(svg_path: &Path) -> Result<()> {
+        let path_str = svg_path
+            .to_str()
+            .context("make_thumbnail: couldn't parse the path into a string")?;
+        let output = std::process::Command::new("rsvg-convert")
+            .args(["--keep-aspect-ratio", path_str, "-o", THUMBNAIL_PATH])
+            .output()?;
+        if !output.stderr.is_empty() {
+            info!(
+                "ffmpeg thumbnail output: {} {}",
+                String::from_utf8(output.stdout).unwrap_or_default(),
+                String::from_utf8(output.stderr).unwrap_or_default()
+            );
+        }
+        Ok(())
+    }
+
     /// Draw the image with ueberzug in the current window.
     /// The position is absolute, which is problematic when the app is embeded into a floating terminal.
     /// The whole struct instance is dropped when the preview is reset and the image is deleted.
@@ -934,6 +986,14 @@ fn is_ext_video(ext: &str) -> bool {
     matches!(ext, "mkv" | "webm" | "mpeg" | "mp4" | "avi" | "flv" | "mpg")
 }
 
+fn is_ext_font(ext: &str) -> bool {
+    matches!(ext, "ttf")
+}
+
+fn is_ext_svg(ext: &str) -> bool {
+    matches!(ext, "svg")
+}
+
 fn is_ext_pdf(ext: &str) -> bool {
     ext == "pdf"
 }