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annotate rust/hg-core/src/revset.rs @ 46614:a069639783a0

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rhg: Check .hg/requires for absence of required features Some old repository layouts are not supported. Differential Revision: https://phab.mercurial-scm.org/D10076
author Simon Sapin <simon.sapin@octobus.net>
date Thu, 25 Feb 2021 21:25:04 +0100
parents 4b381dbbf8b7
children df247f58ecee
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1 //! The revset query language
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2 //!
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3 //! <https://www.mercurial-scm.org/repo/hg/help/revsets>
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4
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5 use crate::repo::Repo;
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6 use crate::revlog::changelog::Changelog;
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7 use crate::revlog::revlog::{Revlog, RevlogError};
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8 use crate::revlog::NodePrefix;
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9 use crate::revlog::{Revision, NULL_REVISION};
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10
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11 /// Resolve a query string into a single revision.
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12 ///
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13 /// Only some of the revset language is implemented yet.
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14 pub fn resolve_single(
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15 input: &str,
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16 repo: &Repo,
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17 ) -> Result<Revision, RevlogError> {
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18 let changelog = Changelog::open(repo)?;
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19
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20 match resolve_rev_number_or_hex_prefix(input, &changelog.revlog) {
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21 Err(RevlogError::InvalidRevision) => {} // Try other syntax
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22 result => return result,
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23 }
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24
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25 if input == "null" {
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26 return Ok(NULL_REVISION);
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27 }
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28
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29 // TODO: support for the rest of the language here.
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30
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31 Err(RevlogError::InvalidRevision)
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32 }
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33
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34 /// Resolve the small subset of the language suitable for revlogs other than
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35 /// the changelog, such as in `hg debugdata --manifest` CLI argument.
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36 ///
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37 /// * A non-negative decimal integer for a revision number, or
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38 /// * An hexadecimal string, for the unique node ID that starts with this
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39 /// prefix
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40 pub fn resolve_rev_number_or_hex_prefix(
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41 input: &str,
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42 revlog: &Revlog,
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43 ) -> Result<Revision, RevlogError> {
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44 if let Ok(integer) = input.parse::<i32>() {
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45 if integer >= 0 && revlog.has_rev(integer) {
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46 return Ok(integer);
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47 }
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48 }
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49 if let Ok(prefix) = NodePrefix::from_hex(input) {
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50 return revlog.get_node_rev(prefix);
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51 }
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52 Err(RevlogError::InvalidRevision)
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53 }