author | Simon Sapin <simon.sapin@octobus.net> |
Tue, 14 Sep 2021 18:10:35 +0200 | |
changeset 47968 | 6f579618ea7b |
parent 47962 | 8c29af0f6d6e |
child 48078 | ddde80830aea |
permissions | -rw-r--r-- |
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//! The revset query language |
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//! |
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//! <https://www.mercurial-scm.org/repo/hg/help/revsets> |
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use crate::errors::HgError; |
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use crate::repo::Repo; |
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use crate::revlog::revlog::{Revlog, RevlogError}; |
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use crate::revlog::NodePrefix; |
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use crate::revlog::{Revision, NULL_REVISION, WORKING_DIRECTORY_HEX}; |
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use crate::Node; |
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/// Resolve a query string into a single revision. |
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/// |
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/// Only some of the revset language is implemented yet. |
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pub fn resolve_single( |
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input: &str, |
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repo: &Repo, |
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) -> Result<Revision, RevlogError> { |
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let changelog = repo.changelog()?; |
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match resolve_rev_number_or_hex_prefix(input, &changelog.revlog) { |
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Err(RevlogError::InvalidRevision) => {} // Try other syntax |
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result => return result, |
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} |
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if input == "null" { |
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return Ok(NULL_REVISION); |
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} |
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// TODO: support for the rest of the language here. |
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Err( |
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HgError::unsupported(format!("cannot parse revset '{}'", input)) |
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.into(), |
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) |
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} |
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/// Resolve the small subset of the language suitable for revlogs other than |
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/// the changelog, such as in `hg debugdata --manifest` CLI argument. |
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/// |
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/// * A non-negative decimal integer for a revision number, or |
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/// * An hexadecimal string, for the unique node ID that starts with this |
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/// prefix |
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pub fn resolve_rev_number_or_hex_prefix( |
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input: &str, |
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revlog: &Revlog, |
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) -> Result<Revision, RevlogError> { |
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// The Python equivalent of this is part of `revsymbol` in |
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// `mercurial/scmutil.py` |
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if let Ok(integer) = input.parse::<i32>() { |
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if integer.to_string() == input |
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&& integer >= 0 |
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&& revlog.has_rev(integer) |
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{ |
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return Ok(integer); |
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} |
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} |
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if let Ok(prefix) = NodePrefix::from_hex(input) { |
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if prefix.is_prefix_of(&Node::from_hex(WORKING_DIRECTORY_HEX).unwrap()) |
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{ |
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return Err(RevlogError::WDirUnsupported); |
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} |
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return revlog.rev_from_node(prefix); |
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} |
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Err(RevlogError::InvalidRevision) |
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} |