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annotate rust/rhg/src/commands/cat.rs @ 45548:33ded2d3f4fc

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rhg: add a limited `rhg cat -r` subcommand It only supports revision specification (rev or full hash) and the list of files to cat. Differential Revision: https://phab.mercurial-scm.org/D9052
author Antoine Cezar <antoine.cezar@octobus.net>
date Tue, 15 Sep 2020 16:51:11 +0200
parents
children db11f8f39caf
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
45548
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1 use crate::commands::Command;
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2 use crate::error::{CommandError, CommandErrorKind};
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3 use crate::ui::utf8_to_local;
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4 use crate::ui::Ui;
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5 use hg::operations::FindRoot;
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6 use hg::operations::{CatRev, CatRevError, CatRevErrorKind};
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7 use hg::utils::hg_path::HgPathBuf;
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8 use micro_timer::timed;
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9 use std::convert::TryFrom;
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10
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11 pub const HELP_TEXT: &str = "
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12 Output the current or given revision of files
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13 ";
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14
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15 pub struct CatCommand<'a> {
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16 rev: Option<&'a str>,
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17 files: Vec<&'a str>,
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18 }
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19
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20 impl<'a> CatCommand<'a> {
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21 pub fn new(rev: Option<&'a str>, files: Vec<&'a str>) -> Self {
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22 Self { rev, files }
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23 }
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24
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25 fn display(&self, ui: &Ui, data: &[u8]) -> Result<(), CommandError> {
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26 ui.write_stdout(data)?;
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27 Ok(())
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28 }
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29 }
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30
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31 impl<'a> Command for CatCommand<'a> {
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32 #[timed]
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33 fn run(&self, ui: &Ui) -> Result<(), CommandError> {
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34 let root = FindRoot::new().run()?;
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35 let cwd = std::env::current_dir()
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36 .or_else(|e| Err(CommandErrorKind::CurrentDirNotFound(e)))?;
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37
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38 let mut files = vec![];
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39 for file in self.files.iter() {
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40 let normalized = cwd.join(&file);
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41 let stripped = normalized
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42 .strip_prefix(&root)
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43 .map_err(|_| CommandErrorKind::Abort(None))?;
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44 let hg_file = HgPathBuf::try_from(stripped.to_path_buf())
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45 .map_err(|_| CommandErrorKind::Abort(None))?;
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46 files.push(hg_file);
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47 }
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48
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49 match self.rev {
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50 Some(rev) => {
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51 let mut operation = CatRev::new(&root, rev, &files)
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52 .map_err(|e| map_rev_error(rev, e))?;
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53 let data =
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54 operation.run().map_err(|e| map_rev_error(rev, e))?;
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55 self.display(ui, &data)
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56 }
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57 None => Err(CommandErrorKind::Unimplemented.into()),
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58 }
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59 }
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60 }
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61
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62 /// Convert `CatRevErrorKind` to `CommandError`
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63 fn map_rev_error(rev: &str, err: CatRevError) -> CommandError {
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64 CommandError {
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65 kind: match err.kind {
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66 CatRevErrorKind::IoError(err) => CommandErrorKind::Abort(Some(
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67 utf8_to_local(&format!("abort: {}\n", err)).into(),
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68 )),
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69 CatRevErrorKind::InvalidRevision => CommandErrorKind::Abort(Some(
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70 utf8_to_local(&format!(
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71 "abort: invalid revision identifier{}\n",
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72 rev
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73 ))
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74 .into(),
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75 )),
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76 CatRevErrorKind::UnsuportedRevlogVersion(version) => {
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77 CommandErrorKind::Abort(Some(
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78 utf8_to_local(&format!(
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79 "abort: unsupported revlog version {}\n",
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80 version
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81 ))
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82 .into(),
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83 ))
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84 }
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85 CatRevErrorKind::CorruptedRevlog => CommandErrorKind::Abort(Some(
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86 "abort: corrupted revlog\n".into(),
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87 )),
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88 CatRevErrorKind::UnknowRevlogDataFormat(format) => {
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89 CommandErrorKind::Abort(Some(
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90 utf8_to_local(&format!(
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91 "abort: unknow revlog dataformat {:?}\n",
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92 format
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93 ))
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94 .into(),
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95 ))
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96 }
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97 },
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98 }
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99 }