bgit 0.4.2

User-friendly Git wrapper for beginners, automating essential tasks like adding, committing, and pushing changes. It includes smart rules to avoid common pitfalls, such as accidentally adding sensitive files or directories and has exclusive support for portable hooks!
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use super::AtomicEvent;
use crate::{bgit_error::BGitError, config::global::BGitGlobalConfig, rules::Rule};
use git2::Repository;
use std::collections::HashSet;
use std::path::Path;

#[derive(Debug, Clone)]
pub(crate) enum LogOperation {
    CheckSoleContributor,
}

pub(crate) struct GitLog<'a> {
    name: String,
    pre_check_rules: Vec<Box<dyn Rule + Send + Sync>>,
    operation: Option<LogOperation>,
    _global_config: &'a BGitGlobalConfig,
}

impl<'a> GitLog<'a> {
    pub fn check_sole_contributor(_global_config: &'a BGitGlobalConfig) -> Self {
        GitLog {
            name: "git_log".to_owned(),
            pre_check_rules: vec![],
            operation: Some(LogOperation::CheckSoleContributor),
            _global_config,
        }
    }
}

impl<'a> AtomicEvent<'a> for GitLog<'a> {
    fn new(_global_config: &'a BGitGlobalConfig) -> Self
    where
        Self: Sized,
    {
        GitLog {
            name: "git_log".to_owned(),
            pre_check_rules: vec![],
            operation: None,
            _global_config,
        }
    }

    fn get_name(&self) -> &str {
        &self.name
    }

    fn get_action_description(&self) -> &str {
        match &self.operation {
            Some(LogOperation::CheckSoleContributor) => {
                "Check if current author is the sole contributor"
            }
            None => "No operation specified",
        }
    }

    fn add_pre_check_rule(&mut self, rule: Box<dyn Rule + Send + Sync>) {
        self.pre_check_rules.push(rule);
    }

    fn get_pre_check_rule(&self) -> &Vec<Box<dyn Rule + Send + Sync>> {
        &self.pre_check_rules
    }

    fn raw_execute(&self) -> Result<bool, Box<BGitError>> {
        let repo = Repository::discover(Path::new("."))
            .map_err(|e| self.to_bgit_error(&format!("Failed to open repository: {e}")))?;

        match &self.operation {
            Some(LogOperation::CheckSoleContributor) => self.check_sole_contributor_impl(&repo),
            None => Err(self.to_bgit_error("No operation specified for GitLog")),
        }
    }
}

impl<'a> GitLog<'a> {
    fn check_sole_contributor_impl(&self, repo: &Repository) -> Result<bool, Box<BGitError>> {
        // Get current user's configuration
        let config = repo
            .config()
            .map_err(|e| self.to_bgit_error(&format!("Failed to get repository config: {e}")))?;

        let current_user_name = config
            .get_string("user.name")
            .map_err(|e| self.to_bgit_error(&format!("Failed to get current user name: {e}")))?;

        let current_user_email = config
            .get_string("user.email")
            .map_err(|e| self.to_bgit_error(&format!("Failed to get current user email: {e}")))?;

        // Collect all unique authors and committers
        let mut authors = HashSet::new();
        let mut committers = HashSet::new();

        let mut revwalk = repo
            .revwalk()
            .map_err(|e| self.to_bgit_error(&format!("Failed to create revwalk: {e}")))?;

        // Try to push HEAD to revwalk
        match revwalk.push_head() {
            Ok(()) => {
                // Continue with normal processing
            }
            Err(e)
                if e.code() == git2::ErrorCode::UnbornBranch
                    || e.code() == git2::ErrorCode::NotFound
                    || e.class() == git2::ErrorClass::Reference =>
            {
                // If there are no commits or the reference doesn't exist,
                // then the current user is technically the sole contributor
                // since there are no other contributors to compare against
                return Ok(true);
            }
            Err(e) => {
                return Err(self.to_bgit_error(&format!("Failed to push HEAD to revwalk: {e}")));
            }
        }

        for oid_result in revwalk {
            let oid = oid_result
                .map_err(|e| self.to_bgit_error(&format!("Failed to get commit OID: {e}")))?;

            let commit = repo
                .find_commit(oid)
                .map_err(|e| self.to_bgit_error(&format!("Failed to find commit: {e}")))?;

            // Get author information
            let author = commit.author();
            if let (Some(author_name), Some(author_email)) = (author.name(), author.email()) {
                authors.insert((author_name.to_string(), author_email.to_string()));
            }

            // Get committer information
            let committer = commit.committer();
            if let (Some(committer_name), Some(committer_email)) =
                (committer.name(), committer.email())
            {
                committers.insert((committer_name.to_string(), committer_email.to_string()));
            }
        }

        // Check if current user is the sole contributor
        let is_sole_author = authors.len() == 1
            && authors.contains(&(current_user_name.clone(), current_user_email.clone()));

        Ok(is_sole_author)
    }
}