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annotate rust/chg/src/runcommand.rs @ 45625:c11099cc1de4

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log: map --removed to walkopts.force_changelog_traversal This is the flag to forcibly enable the slowpath. I'm not sure if the slowpath parameter should be merged with this flag, so let's keep it as an immutable flag for now. I'll add another flag to support "grep --all-files". These two will be the flags which aren't directly mapped from the command-line options.
author Yuya Nishihara <yuya@tcha.org>
date Sat, 12 Sep 2020 21:54:58 +0900
parents 426294d06ddc
children
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1 // Copyright 2018 Yuya Nishihara <yuya@tcha.org>
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2 //
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3 // This software may be used and distributed according to the terms of the
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4 // GNU General Public License version 2 or any later version.
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5
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6 //! Functions to run Mercurial command in cHg-aware command server.
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7
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8 use bytes::Bytes;
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9 use std::io;
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10 use std::os::unix::io::AsRawFd;
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11 use tokio_hglib::codec::ChannelMessage;
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12 use tokio_hglib::{Connection, Protocol};
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13
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14 use crate::attachio;
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15 use crate::message::{self, CommandType};
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16 use crate::uihandler::SystemHandler;
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17
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18 /// Runs the given Mercurial command in cHg-aware command server, and
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19 /// fetches the result code.
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20 ///
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21 /// This is a subset of tokio-hglib's `run_command()` with the additional
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22 /// SystemRequest support.
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23 pub async fn run_command(
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24 proto: &mut Protocol<impl Connection + AsRawFd>,
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25 handler: &mut impl SystemHandler,
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26 packed_args: impl Into<Bytes>,
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27 ) -> io::Result<i32> {
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28 proto
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29 .send_command_with_args("runcommand", packed_args)
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30 .await?;
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31 loop {
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32 match proto.fetch_response().await? {
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33 ChannelMessage::Data(b'r', data) => {
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34 return message::parse_result_code(data);
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35 }
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36 ChannelMessage::Data(..) => {
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37 // just ignores data sent to optional channel
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38 }
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39 ChannelMessage::InputRequest(..)
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40 | ChannelMessage::LineRequest(..) => {
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41 return Err(io::Error::new(
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42 io::ErrorKind::InvalidData,
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43 "unsupported request",
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44 ));
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45 }
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46 ChannelMessage::SystemRequest(data) => {
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47 let (cmd_type, cmd_spec) = message::parse_command_spec(data)?;
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48 match cmd_type {
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49 CommandType::Pager => {
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50 // server spins new command loop while pager request is
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51 // in progress, which can be terminated by "" command.
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52 let pin = handler.spawn_pager(&cmd_spec).await?;
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53 attachio::attach_io(proto, &io::stdin(), &pin, &pin)
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54 .await?;
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55 proto.send_command("").await?; // terminator
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56 }
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57 CommandType::System => {
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58 let code = handler.run_system(&cmd_spec).await?;
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59 let data = message::pack_result_code(code);
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60 proto.send_data(data).await?;
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61 }
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62 }
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63 }
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64 }
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65 }
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66 }