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annotate rust/rhg/src/commands/debugrequirements.rs @ 46136:dca9cb99971c

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rust: replace most "operation" structs with functions The hg-core crate has a partially-formed concept of "operation", represented as structs with constructors and a `run` method. Each struct?s contructor takes different parameters, and each `run` has a different return type. Constructors typically don?t do much more than store parameters for `run` to access them. There was a comment about adding an `Operation` trait when the language supports expressing something so general, but it?s hard to imagine how operations with such different APIs could be used in a generic context. This commit starts removing the concept of "operation", since those are pretty much just functions. Differential Revision: https://phab.mercurial-scm.org/D9595
author Simon Sapin <simon.sapin@octobus.net>
date Mon, 14 Dec 2020 14:59:23 +0100
parents a2eda1ff22aa
children 8a4914397d02
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1 use crate::commands::Command;
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2 use crate::error::CommandError;
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3 use crate::ui::Ui;
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4 use hg::operations::find_root;
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5 use hg::requirements;
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6
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7 pub const HELP_TEXT: &str = "
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8 Print the current repo requirements.
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9 ";
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11 pub struct DebugRequirementsCommand {}
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12
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13 impl DebugRequirementsCommand {
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14 pub fn new() -> Self {
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15 DebugRequirementsCommand {}
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16 }
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17 }
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18
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19 impl Command for DebugRequirementsCommand {
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20 fn run(&self, ui: &Ui) -> Result<(), CommandError> {
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21 let root = find_root()?;
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22 let mut output = String::new();
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23 for req in requirements::load(&root)? {
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24 output.push_str(&req);
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25 output.push('\n');
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26 }
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27 ui.write_stdout(output.as_bytes())?;
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28 Ok(())
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29 }
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30 }