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annotate rust/hg-core/src/revset.rs @ 49175:34decbaf4da3

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node: manually implement Debug I got too irritated today with the default Debug implementation of hg::revlog::Node while playing with a new parser. This isn't quite what I wanted, but it wasn't much code and it at least gives you output that's easy to visually compare to a node.hex()ed identifier from the Python side of things. Sadly, this doesn't influence the output in lldb or the VSCode debugger extension that uses lldb under the covers, but it at least means debug prints are a little more useful. Differential Revision: https://phab.mercurial-scm.org/D12608
author Augie Fackler <augie@google.com>
date Thu, 05 May 2022 14:47:26 -0400
parents 3da7bf75fdb2
children e98fd81bb151
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rev   line source
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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 input {
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22 "." => {
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23 let p1 = repo.dirstate_parents()?.p1;
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24 return Ok(changelog.revlog.rev_from_node(p1.into())?);
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25 }
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26 "null" => return Ok(NULL_REVISION),
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27 _ => {}
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28 }
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29
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30 match resolve_rev_number_or_hex_prefix(input, &changelog.revlog) {
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31 Err(RevlogError::InvalidRevision) => {
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32 // TODO: support for the rest of the language here.
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33 let msg = format!("cannot parse revset '{}'", input);
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34 Err(HgError::unsupported(msg).into())
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35 }
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36 result => return result,
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37 }
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38 }
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39
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40 /// Resolve the small subset of the language suitable for revlogs other than
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41 /// the changelog, such as in `hg debugdata --manifest` CLI argument.
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42 ///
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43 /// * A non-negative decimal integer for a revision number, or
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44 /// * An hexadecimal string, for the unique node ID that starts with this
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45 /// prefix
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46 pub fn resolve_rev_number_or_hex_prefix(
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47 input: &str,
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48 revlog: &Revlog,
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49 ) -> Result<Revision, RevlogError> {
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50 // The Python equivalent of this is part of `revsymbol` in
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51 // `mercurial/scmutil.py`
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52
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53 if let Ok(integer) = input.parse::<i32>() {
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54 if integer.to_string() == input
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55 && integer >= 0
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56 && revlog.has_rev(integer)
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57 {
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58 return Ok(integer);
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59 }
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60 }
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61 if let Ok(prefix) = NodePrefix::from_hex(input) {
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62 if prefix.is_prefix_of(&Node::from_hex(WORKING_DIRECTORY_HEX).unwrap())
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63 {
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64 return Err(RevlogError::WDirUnsupported);
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65 }
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66 return revlog.rev_from_node(prefix);
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67 }
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68 Err(RevlogError::InvalidRevision)
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69 }