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annotate rust/hg-core/src/requirements.rs @ 45924:a2eda1ff22aa

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requirements: move loading to hg-core and add parsing No functional change, checking comes later. Differential Revision: https://phab.mercurial-scm.org/D9398
author Simon Sapin <simon-commits@exyr.org>
date Tue, 24 Nov 2020 17:49:16 +0100
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children 2ad2745e0be9
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45924
a2eda1ff22aa requirements: move loading to hg-core and add parsing
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1 use std::io;
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2 use std::path::Path;
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3
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4 #[derive(Debug)]
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5 pub enum RequirementsError {
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6 // TODO: include a path?
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7 Io(io::Error),
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8 /// The `requires` file is corrupted
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9 Corrupted,
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10 /// The repository requires a feature that we don’t support
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11 Unsupported {
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12 feature: String,
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13 },
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14 }
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15
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16 fn parse(bytes: &[u8]) -> Result<Vec<String>, ()> {
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17 // The Python code reading this file uses `str.splitlines`
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18 // which looks for a number of line separators (even including a couple of
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19 // non-ASCII ones), but Python code writing it always uses `\n`.
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20 let lines = bytes.split(|&byte| byte == b'\n');
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21
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22 lines
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23 .filter(|line| !line.is_empty())
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24 .map(|line| {
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25 // Python uses Unicode `str.isalnum` but feature names are all
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26 // ASCII
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27 if line[0].is_ascii_alphanumeric() {
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28 Ok(String::from_utf8(line.into()).unwrap())
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29 } else {
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30 Err(())
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31 }
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32 })
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33 .collect()
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34 }
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35
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36 pub fn load(repo_root: &Path) -> Result<Vec<String>, RequirementsError> {
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37 match std::fs::read(repo_root.join(".hg").join("requires")) {
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38 Ok(bytes) => parse(&bytes).map_err(|()| RequirementsError::Corrupted),
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39
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40 // Treat a missing file the same as an empty file.
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41 // From `mercurial/localrepo.py`:
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42 // > requires file contains a newline-delimited list of
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43 // > features/capabilities the opener (us) must have in order to use
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44 // > the repository. This file was introduced in Mercurial 0.9.2,
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45 // > which means very old repositories may not have one. We assume
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46 // > a missing file translates to no requirements.
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47 Err(error) if error.kind() == std::io::ErrorKind::NotFound => {
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48 Ok(Vec::new())
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49 }
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50
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51 Err(error) => Err(RequirementsError::Io(error))?,
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52 }
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53 }