terminfo: Pretend to be xterm if Windows console supports ansi

 Windows people seem to be fine with this:
 microsoft/WSL#1446

 I still think a precise terminfo file with the list of
 supported sequences documented in the below link would be ideal:
 https://docs.microsoft.com/en-us/windows/console/console-virtual-terminal-sequences

 But I didn't find such a file. And I don't know how to generate one easily.

 A copy of xterm-256color terminfo file is included at compile-time.
 I copied it from ncurses 6.1.

 With this commit, term should be on par with ansi_term for Windows 10
 users.

Signed-off-by: Mohammad AlSaleh <[email protected]>

src/terminfo/mod.rs

@@ -18,6 +18,10 @@ use std::io;
 use std::io::BufReader;
 use std::path::Path;
 
+
+#[cfg(windows)]
+use win;
+
 use Attr;
 use color;
 use Terminal;
@@ -67,6 +71,18 @@ impl TermInfo {
                 }
             })
         });
+
+        #[cfg(windows)]
+        {
+            if term_name.is_none() && win::conout_supports_ansi() {
+                // Microsoft people don't seem to be okay with pretending to be xterm:
+                // https://github.com/Microsoft/WSL/issues/1446
+                // We have to ship xterm's terminfo file since the database
+                // is not shipped with Windows
+                return TermInfo::from_bytes(include_bytes!("../../assets/xterm-256color"));
+            }
+        }
+
         if let Some(term_name) = term_name {
             return TermInfo::from_name(term_name);
         } else {
@@ -123,6 +139,12 @@ impl TermInfo {
         parse(&mut reader, false)
     }
 
+    // Get TermInfo from a byte slice directly
+    fn from_bytes(bytes: &[u8]) -> Result<TermInfo> {
+        let mut reader = BufReader::new(bytes);
+        parse(&mut reader, false)
+    }
+
     /// Retrieve a capability `cmd` and expand it with `params`, writing result to `out`.
     pub fn apply_cap(&self, cmd: &str, params: &[Param], out: &mut io::Write) -> Result<()> {
         match self.strings.get(cmd) {