CP437 support

Cargo.lock

@@ -4,403 +4,408 @@
 name = "atty"
 version = "0.2.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
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+ "hermit-abi",
- "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc",
- "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8",
 ]
 
 [[package]]
 name = "autocfg"
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+checksum = "1d49d90015b3c36167a20fe2810c5cd875ad504b39cff3d4eae7977e6b7c1cb2"
 
 [[package]]
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 [[package]]
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 [[package]]
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- "ppv-lite86 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ppv-lite86",
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 [[package]]
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 [[package]]
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 [[package]]
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+ "libc",
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 [[package]]
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 [[package]]
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+ "libc",
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 [[package]]
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 [[package]]
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 dependencies = [
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Cargo.toml

@@ -38,6 +38,7 @@ termion = "1.5.5"
 libc = "0.2.66"
 atty = "0.2.14"
 lazy_static = "1.4"
+cp437 = "0.1.1"
 
 tor-stream = { version = "0.2.0", optional = true }
 native-tls = { version = "0.2", optional = true }

src/encoding.rs

@@ -0,0 +1,7 @@
+/// Encoding of Gopher response. Only UTF8 and CP437 are supported.
+pub(crate) enum Encoding {
+    /// Unicode
+    UTF8,
+    /// https://en.wikipedia.org/wiki/Code_page_437
+    CP437,
+}

src/gopher.rs

@@ -74,7 +74,7 @@ pub struct Url<'a> {
 
 /// Fetches a gopher URL and returns a tuple of:
 ///   (did tls work?, raw Gopher response)
-pub fn fetch_url(url: &str, tls: bool, tor: bool) -> Result<(bool, String)> {
+pub fn fetch_url(url: &str, tls: bool, tor: bool) -> Result<(bool, Vec<u8>)> {
     let u = parse_url(url);
     fetch(u.host, u.port, u.sel, tls, tor)
 }
@@ -87,13 +87,19 @@ pub fn fetch(
     selector: &str,
     tls: bool,
     tor: bool,
-) -> Result<(bool, String)> {
+) -> Result<(bool, Vec<u8>)> {
     let mut stream = request(host, port, selector, tls, tor)?;
     let mut body = Vec::new();
     stream.read_to_end(&mut body)?;
-    let mut out = String::from_utf8_lossy(&body).to_string();
+    Ok((stream.is_tls(), body))
-    clean_response(&mut out);
+}
-    Ok((stream.is_tls(), out))
+
+/// Turn a Gopher response from `fetch` into a UTF8 String, cleaning
+/// up unprintable characters along the way.
+pub fn response_to_string(res: &[u8]) -> String {
+    let mut s = String::from_utf8_lossy(res).to_string();
+    clean_response(&mut s);
+    s
 }
 
 /// Removes unprintable characters from Gopher response.

src/lib.rs

@@ -43,6 +43,7 @@ pub mod color;
 pub mod args;
 pub mod bookmarks;
 pub mod config;
+mod encoding;
 pub mod gopher;
 pub mod help;
 pub mod history;

src/main.rs

@@ -6,7 +6,7 @@ use std::{
     env,
     error::Error,
     io::{self, stdout, Write},
-    panic, process,
+    panic, process, str,
 };
 
 fn main() {
@@ -100,7 +100,7 @@ Once you've launched phetch, use `ctrl-h` to view the on-line help."
 /// Print just the raw Gopher response.
 fn print_raw(url: &str, tls: bool, tor: bool) -> Result<(), Box<dyn Error>> {
     let (_, out) = gopher::fetch_url(url, tls, tor)?;
-    println!("{}", out);
+    println!("{}", gopher::response_to_string(&out));
     Ok(())
 }
 
@@ -110,6 +110,7 @@ fn print_plain(url: &str, tls: bool, tor: bool) -> Result<(), Box<dyn Error>> {
     let mut out = String::new();
     let typ = gopher::type_for_url(url);
     let (_, response) = gopher::fetch_url(url, tls, tor)?;
+    let response = gopher::response_to_string(&response);
     match typ {
         gopher::Type::Menu => {
             let menu = menu::parse(url, response);

src/text.rs

@@ -4,10 +4,11 @@
 
 use crate::{
     config::Config,
+    encoding::Encoding,
     terminal,
     ui::{self, Action, Key, View, MAX_COLS, SCROLL_LINES},
 };
-use std::fmt;
+use std::{borrow::Cow, fmt, str};
 
 /// The Text View holds the raw Gopher response as well as information
 /// about which lines should currently be displayed on screen.
@@ -15,7 +16,7 @@ pub struct Text {
     /// Gopher URL
     url: String,
     /// Gopher response
-    raw_response: String,
+    raw_response: Vec<u8>,
     /// Current scroll offset, in rows
     scroll: usize,
     /// Number of lines
@@ -30,6 +31,8 @@ pub struct Text {
     pub tor: bool,
     /// UI mode. Interactive (Run), Printing, Raw mode...
     mode: ui::Mode,
+    /// Text Encoding of Response
+    encoding: Encoding,
     /// Currently in wide mode?
     pub wide: bool,
 }
@@ -54,7 +57,7 @@ impl View for Text {
     }
 
     fn raw(&self) -> &str {
-        self.raw_response.as_ref()
+        str::from_utf8(&self.raw_response).unwrap_or_default()
     }
 
     fn term_size(&mut self, cols: usize, rows: usize) {
@@ -79,6 +82,7 @@ impl View for Text {
                 self.scroll = self.final_scroll();
                 Action::Redraw
             }
+            Key::Ctrl('e') => self.toggle_encoding(),
             Key::Down | Key::Ctrl('n') | Key::Char('n') | Key::Ctrl('j') | Key::Char('j') => {
                 if self.scroll < self.final_scroll() {
                     self.scroll += 1;
@@ -138,8 +142,8 @@ impl View for Text {
         } else {
             self.lines
         };
-        let iter = self
+        let response = self.encoded_response();
-            .raw_response
+        let iter = response
             .split_terminator('\n')
             .skip(self.scroll)
             .take(limit);
@@ -170,15 +174,19 @@ impl View for Text {
 
 impl Text {
     /// Create a Text View from a raw Gopher response and a few options.
-    pub fn from(url: &str, response: String, config: &Config, tls: bool) -> Text {
+    pub fn from(url: &str, response: Vec<u8>, config: &Config, tls: bool) -> Text {
         let mut lines = 0;
         let mut longest = 0;
+        let mut line_len = 0;
 
-        for line in response.split_terminator('\n') {
+        for &b in &response {
+            line_len += 1;
+            if b == b'\n' {
+                if line_len > longest {
+                    longest = line_len;
+                }
+                line_len = 0;
                 lines += 1;
-            let count = line.chars().count();
-            if count > longest {
-                longest = count;
             }
         }
 
@@ -192,10 +200,34 @@ impl Text {
             mode: config.mode,
             tls,
             tor: config.tor,
+            encoding: Encoding::UTF8,
             wide: config.wide,
         }
     }
 
+    /// Toggle between our two encodings.
+    fn toggle_encoding(&mut self) -> Action {
+        if matches!(self.encoding, Encoding::UTF8) {
+            self.encoding = Encoding::CP437;
+        } else {
+            self.encoding = Encoding::UTF8;
+        }
+        Action::Redraw
+    }
+
+    /// Interpret `self.raw_response` according to `self.encoding`.
+    fn encoded_response(&self) -> Cow<str> {
+        if matches!(self.encoding, Encoding::CP437) {
+            let mut converted = String::with_capacity(self.raw_response.len());
+            for b in &self.raw_response {
+                converted.push_str(cp437::convert_byte(&b));
+            }
+            Cow::from(converted)
+        } else {
+            String::from_utf8_lossy(&self.raw_response)
+        }
+    }
+
     /// Final `self.scroll` value.
     fn final_scroll(&self) -> usize {
         let padding = (self.size.1 as f64 * 0.9) as usize;

src/ui.rs

@@ -268,7 +268,12 @@ impl UI {
         };
         let typ = gopher::type_for_url(&url);
         match typ {
-            Type::Menu | Type::Search => Ok(Box::new(Menu::from(url, res, &self.config, tls))),
+            Type::Menu | Type::Search => Ok(Box::new(Menu::from(
+                url,
+                gopher::response_to_string(&res),
+                &self.config,
+                tls,
+            ))),
             Type::Text | Type::HTML => Ok(Box::new(Text::from(url, res, &self.config, tls))),
             _ => Err(error!("Unsupported Gopher Response: {:?}", typ)),
         }
@@ -627,8 +632,8 @@ impl UI {
                 'r' => {
                     if let Some(view) = self.views.get(self.focused) {
                         let url = view.url();
-                        let raw = view.raw().to_string();
+                        let mut text =
-                        let mut text = Text::from(url, raw, &self.config, view.is_tls());
+                            Text::from(url, view.raw().into(), &self.config, view.is_tls());
                         text.wide = true;
                         self.add_view(Box::new(text));
                     }