use std::cmp::Ordering::Equal;
use std::default::Default;
use std::env;
+use std::ffi::OsString;
use std::io::{self, Read, Write};
use std::iter::repeat;
use std::path::PathBuf;
-use std::process;
+use std::process::{self, Command, Stdio};
use std::rc::Rc;
use std::str;
use std::sync::{Arc, Mutex};
match descriptions.find_description(&normalised) {
Some(ref description) => {
let mut is_in_code_block = false;
+ let mut text = String::new();
+
// Slice off the leading newline and print.
for line in description[1..].lines() {
let indent_level = line.find(|c: char| !c.is_whitespace())
let dedented_line = &line[indent_level..];
if dedented_line.starts_with("```") {
is_in_code_block = !is_in_code_block;
- println!("{}", &line[..(indent_level+3)]);
+ text.push_str(&line[..(indent_level+3)]);
+ text.push('\n');
} else if is_in_code_block && dedented_line.starts_with("# ") {
continue;
} else {
- println!("{}", line);
+ text.push_str(line);
+ text.push('\n');
}
}
+
+ show_content_with_pager(&text);
}
None => {
early_error(output, &format!("no extended information for {}", code));
}
}
+fn show_content_with_pager(content: &String) {
+ let pager_name = env::var_os("PAGER").unwrap_or(if cfg!(windows) {
+ OsString::from("more.com")
+ } else {
+ OsString::from("less")
+ });
+
+ let mut fallback_to_println = false;
+
+ match Command::new(pager_name).stdin(Stdio::piped()).spawn() {
+ Ok(mut pager) => {
+ if let Some(mut pipe) = pager.stdin.as_mut() {
+ if pipe.write_all(content.as_bytes()).is_err() {
+ fallback_to_println = true;
+ }
+ }
+
+ if pager.wait().is_err() {
+ fallback_to_println = true;
+ }
+ }
+ Err(_) => {
+ fallback_to_println = true;
+ }
+ }
+
+ // If pager fails for whatever reason, we should still print the content
+ // to standard output
+ if fallback_to_println {
+ println!("{}", content);
+ }
+}
+
impl<'a> CompilerCalls<'a> for RustcDefaultCalls {
fn early_callback(&mut self,
matches: &getopts::Matches,