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annotate rust/rhg/src/commands/cat.rs @ 46436:252d1bdba33d

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rhg: replace `map_*_error` functions with `From` impls Differential Revision: https://phab.mercurial-scm.org/D9876
author Simon Sapin <simon.sapin@octobus.net>
date Tue, 26 Jan 2021 20:31:26 +0100
parents 3e2d539d0d1a
children ca3f73cc3cf4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 use crate::commands::Command;
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2 use crate::error::CommandError;
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3 use crate::ui::Ui;
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4 use hg::operations::cat;
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5 use hg::repo::Repo;
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6 use hg::utils::hg_path::HgPathBuf;
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7 use micro_timer::timed;
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8 use std::convert::TryFrom;
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9
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10 pub const HELP_TEXT: &str = "
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11 Output the current or given revision of files
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12 ";
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13
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14 pub struct CatCommand<'a> {
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15 rev: Option<&'a str>,
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16 files: Vec<&'a str>,
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17 }
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19 impl<'a> CatCommand<'a> {
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20 pub fn new(rev: Option<&'a str>, files: Vec<&'a str>) -> Self {
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21 Self { rev, files }
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22 }
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23
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24 fn display(&self, ui: &Ui, data: &[u8]) -> Result<(), CommandError> {
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25 ui.write_stdout(data)?;
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26 Ok(())
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27 }
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28 }
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30 impl<'a> Command for CatCommand<'a> {
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31 #[timed]
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32 fn run(&self, ui: &Ui) -> Result<(), CommandError> {
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33 let repo = Repo::find()?;
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34 repo.check_requirements()?;
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35 let cwd = std::env::current_dir()
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36 .or_else(|e| Err(CommandError::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(&repo.working_directory_path())
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43 .or(Err(CommandError::Abort(None)))?;
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44 let hg_file = HgPathBuf::try_from(stripped.to_path_buf())
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45 .or(Err(CommandError::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 data = cat(&repo, rev, &files).map_err(|e| (e, rev))?;
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52 self.display(ui, &data)
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53 }
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54 None => Err(CommandError::Unimplemented.into()),
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55 }
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56 }
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57 }