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annotate rust/hg-core/src/revset.rs @ 48061:060cd909439f

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dirstate: drop all logic around the "non-normal" sets The dirstate has a lot of code to compute a set of all "non-normal" and "from_other_parent" entries. This is all used in one, unique, location, when `setparent` is called and moved from a merge to a non merge. At that time, any "merge related" information has to be dropped. This is mostly useful for command like `graft` or `shelve` that move to a single-parent state -before- the commit. Otherwise the commit will already have removed all traces of the merge information in the dirstate (e.g. for a regular merges). The bookkeeping for these sets is quite invasive. And it seems simpler to just drop it and do the full computation in the single location where we actually use it (since we have to do the computation at least once anyway). This simplify the code a lot, and clarify why this kind of computation is needed. The possible drawback compared to the previous code are: - if the operation happens in a loop, we will end up doing it multiple time, - the C code to detect entry of interest have been dropped, for now. It will be re-introduced later, with a processing code directly in C for even faster operation. Differential Revision: https://phab.mercurial-scm.org/D11507
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Tue, 28 Sep 2021 20:05:37 +0200
parents 6f579618ea7b
children ddde80830aea
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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::errors::HgError;
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6 use crate::repo::Repo;
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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, WORKING_DIRECTORY_HEX};
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10 use crate::Node;
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11
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12 /// Resolve a query string into a single revision.
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13 ///
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14 /// Only some of the revset language is implemented yet.
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15 pub fn resolve_single(
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16 input: &str,
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17 repo: &Repo,
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18 ) -> Result<Revision, RevlogError> {
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19 let changelog = repo.changelog()?;
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20
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21 match resolve_rev_number_or_hex_prefix(input, &changelog.revlog) {
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22 Err(RevlogError::InvalidRevision) => {} // Try other syntax
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23 result => return result,
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24 }
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25
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26 if input == "null" {
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27 return Ok(NULL_REVISION);
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28 }
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30 // TODO: support for the rest of the language here.
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31
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32 Err(
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33 HgError::unsupported(format!("cannot parse revset '{}'", input))
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34 .into(),
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35 )
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36 }
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37
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38 /// Resolve the small subset of the language suitable for revlogs other than
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39 /// the changelog, such as in `hg debugdata --manifest` CLI argument.
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40 ///
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41 /// * A non-negative decimal integer for a revision number, or
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42 /// * An hexadecimal string, for the unique node ID that starts with this
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43 /// prefix
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44 pub fn resolve_rev_number_or_hex_prefix(
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45 input: &str,
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46 revlog: &Revlog,
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47 ) -> Result<Revision, RevlogError> {
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48 // The Python equivalent of this is part of `revsymbol` in
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49 // `mercurial/scmutil.py`
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50
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51 if let Ok(integer) = input.parse::<i32>() {
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52 if integer.to_string() == input
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53 && integer >= 0
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54 && revlog.has_rev(integer)
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55 {
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56 return Ok(integer);
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57 }
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58 }
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59 if let Ok(prefix) = NodePrefix::from_hex(input) {
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60 if prefix.is_prefix_of(&Node::from_hex(WORKING_DIRECTORY_HEX).unwrap())
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61 {
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62 return Err(RevlogError::WDirUnsupported);
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63 }
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64 return revlog.rev_from_node(prefix);
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65 }
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66 Err(RevlogError::InvalidRevision)
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67 }