refactor(cable): stream in cable results + better error logging + default delimiter consistency (#257)

crates/television-channels/src/channels/cable.rs

@@ -1,4 +1,6 @@
 use std::collections::HashSet;
+use std::io::{BufRead, BufReader};
+use std::process::Stdio;
 
 use color_eyre::Result;
 use lazy_static::lazy_static;
@@ -104,19 +106,37 @@ impl Channel {
 #[allow(clippy::unused_async)]
 async fn load_candidates(command: String, injector: Injector<String>) {
     debug!("Loading candidates from command: {:?}", command);
-    let output = shell_command()
+    let mut child = shell_command()
         .arg(command)
-        .output()
+        .stdout(Stdio::piped())
+        .stderr(Stdio::piped())
+        .spawn()
         .expect("failed to execute process");
 
-    let decoded_output = String::from_utf8_lossy(&output.stdout);
-    debug!("Decoded output: {:?}", decoded_output);
+    if let Some(out) = child.stdout.take() {
+        let reader = BufReader::new(out);
+        let mut produced_output = false;
 
-    for line in decoded_output.lines() {
+        for line in reader.lines() {
+            let line = line.unwrap();
             if !line.trim().is_empty() {
-            let () = injector.push(line.to_string(), |e, cols| {
+                let () = injector.push(line, |e, cols| {
                     cols[0] = e.clone().into();
                 });
+                produced_output = true;
+            }
+        }
+
+        if !produced_output {
+            let reader = BufReader::new(child.stderr.take().unwrap());
+            for line in reader.lines() {
+                let line = line.unwrap();
+                if !line.trim().is_empty() {
+                    let () = injector.push(line, |e, cols| {
+                        cols[0] = e.clone().into();
+                    });
+                }
+            }
         }
     }
 }

crates/television-previewers/src/previewers/command.rs

@@ -1,4 +1,3 @@
-/// git log --oneline --date=short --pretty="format:%C(auto)%h %s %Cblue%an %C(green)%cd" "$@" | ~/code/rust/television/target/release/tv --preview 'git show -p --stat --pretty=fuller --color=always {0}' --delimiter ' '
 use crate::previewers::cache::PreviewCache;
 use crate::previewers::{Preview, PreviewContent};
 use lazy_static::lazy_static;
@@ -27,7 +26,7 @@ pub struct CommandPreviewerConfig {
     delimiter: String,
 }
 
-const DEFAULT_DELIMITER: &str = ":";
+const DEFAULT_DELIMITER: &str = " ";
 
 impl Default for CommandPreviewerConfig {
     fn default() -> Self {
@@ -124,19 +123,21 @@ lazy_static! {
 /// let entry = Entry::new("a:given:entry:to:preview".to_string(), PreviewType::Command(command.clone()));
 /// let formatted_command = format_command(&command, &entry);
 ///
-/// assert_eq!(formatted_command, "something a:given:entry:to:preview entry a");
+/// assert_eq!(formatted_command, "something 'a:given:entry:to:preview' 'entry' 'a'");
 /// ```
 pub fn format_command(command: &PreviewCommand, entry: &Entry) -> String {
     let parts = entry.name.split(&command.delimiter).collect::<Vec<&str>>();
     debug!("Parts: {:?}", parts);
 
-    let mut formatted_command = command.command.replace("{}", &entry.name);
+    let mut formatted_command = command
+        .command
+        .replace("{}", format!("'{}'", entry.name).as_str());
 
     formatted_command = COMMAND_PLACEHOLDER_REGEX
         .replace_all(&formatted_command, |caps: &regex::Captures| {
             let index =
                 caps.get(1).unwrap().as_str().parse::<usize>().unwrap();
-            parts[index].to_string()
+            format!("'{}'", parts[index])
         })
         .to_string();
 
@@ -202,7 +203,10 @@ mod tests {
         );
         let formatted_command = format_command(&command, &entry);
 
-        assert_eq!(formatted_command, "something an:entry:to:preview to an");
+        assert_eq!(
+            formatted_command,
+            "something 'an:entry:to:preview' 'to' 'an'"
+        );
     }
 
     #[test]
@@ -232,7 +236,7 @@ mod tests {
         );
         let formatted_command = format_command(&command, &entry);
 
-        assert_eq!(formatted_command, "something an:entry:to:preview");
+        assert_eq!(formatted_command, "something 'an:entry:to:preview'");
     }
 
     #[test]
@@ -247,6 +251,6 @@ mod tests {
         );
         let formatted_command = format_command(&command, &entry);
 
-        assert_eq!(formatted_command, "something an -t to");
+        assert_eq!(formatted_command, "something 'an' -t 'to'");
     }
 }

crates/television/cli.rs

@@ -31,7 +31,7 @@ pub struct Cli {
     pub no_preview: bool,
 
     /// The delimiter used to extract fields from the entry to provide to the preview command
-    /// (defaults to ":")
+    /// (defaults to " ")
     #[arg(long, value_name = "STRING", default_value = " ", value_parser = delimiter_parser)]
     pub delimiter: String,
 
@@ -283,7 +283,7 @@ pub fn guess_channel_from_prompt(
 #[allow(clippy::unnecessary_wraps)]
 fn delimiter_parser(s: &str) -> Result<String, String> {
     Ok(match s {
-        "" => ":".to_string(),
+        "" => " ".to_string(),
         "\\t" => "\t".to_string(),
         _ => s.to_string(),
     })