From f4a80ef0a51e31351a808fc539267053d1a15fe5 Mon Sep 17 00:00:00 2001
From: Daniel Brooks <db48x@orod-na-thon.tailcd79e.ts.net>
Date: Fri, 5 Jul 2024 06:47:53 -0700
Subject: [PATCH] print an OSC8 hyperlink around the filename when -n is
 specified

This lets the user to open the file by clicking on or otherwise
selecting the hyperlink in their terminal emulator.
---
 Cargo.lock | 18 ++++++++++++++++++
 Cargo.toml |  2 ++
 src/app.rs | 28 +++++++++++++++++++++++++++-
 3 files changed, 47 insertions(+), 1 deletion(-)

diff --git a/Cargo.lock b/Cargo.lock
index a1124b8..2335699 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -107,6 +107,12 @@ version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
 
+[[package]]
+name = "bytes"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "514de17de45fdb8dc022b1a7975556c53c86f9f0aa5f534b98977b171857c2c9"
+
 [[package]]
 name = "cfg-if"
 version = "1.0.0"
@@ -319,6 +325,16 @@ dependencies = [
  "spin",
 ]
 
+[[package]]
+name = "gethostname"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0176e0459c2e4a1fe232f984bca6890e681076abb9934f6cea7c326f3fc47818"
+dependencies = [
+ "libc",
+ "windows-targets 0.48.5",
+]
+
 [[package]]
 name = "gif"
 version = "0.12.0"
@@ -704,9 +720,11 @@ checksum = "711b9620af191e0cdc7468a8d14e709c3dcdb115b36f838e601583af800a370a"
 name = "viu"
 version = "1.5.0"
 dependencies = [
+ "bytes",
  "clap",
  "crossterm",
  "ctrlc",
+ "gethostname",
  "image",
  "viuer",
 ]
diff --git a/Cargo.toml b/Cargo.toml
index 6ff19e8..1ae6762 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -17,6 +17,8 @@ crossterm = "0.27"
 viuer = "0.7.1"
 ctrlc = { version = "3.4", features = ["termination"] }
 image = "0.24"
+gethostname = "0.4"
+bytes = "1.6"
 
 [features]
 default = []
diff --git a/src/app.rs b/src/app.rs
index 424bc6f..8db2791 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -116,7 +116,33 @@ fn view_directory(conf: &Config, dirname: &str, (tx, rx): TxRx) -> ViuResult {
 
 fn view_file(conf: &Config, filename: &str, (tx, rx): TxRx) -> ViuResult {
     if conf.name {
-        println!("{}:", filename);
+        if let Ok(path) = std::fs::canonicalize(filename) {
+            // In principle, we are doing this:
+            // println!("{osc}8;;file://{hostname}{path}{st}{filename}{osc}8;;{st}:", hostname=gethostname().to_string_lossy(), path=path.display());
+            // but without ever putting anything into a utf8 string
+            use bytes::BufMut;
+            use std::os::unix::ffi::OsStrExt;
+            use std::io::Write;
+            let osc = b"\x1b]";
+            let st = b"\x1b\\";
+            let hostname = gethostname::gethostname();
+            let path = path.into_os_string();
+            let len = 23 + hostname.len() + path.len();
+            let mut buf = bytes::BytesMut::with_capacity(len);
+            buf.extend_from_slice(osc);
+            buf.put(&b"8;;file://"[..]);
+            buf.put(hostname.as_bytes());
+            buf.put(path.as_bytes());
+            buf.extend_from_slice(st);
+            buf.put(filename.as_bytes());
+            buf.extend_from_slice(osc);
+            buf.put(&b"8;;"[..]);
+            buf.extend_from_slice(st);
+            buf.put(&b":\n"[..]);
+            stdout().lock().write_all(&buf)?;
+        } else {
+            println!("{filename}:");
+        }
     }
     let mut file_in = fs::File::open(filename)?;