ci_env 0.4.1

Detect CI information from the environment.
Documentation 
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use crate::api::{opt_var, var, CiEnvironment, CiProvider};

// https://docs.gitlab.com/ee/ci/variables/predefined_variables.html
pub fn create_environment() -> CiEnvironment {
    let mut ci = CiEnvironment {
        base_branch: opt_var("CI_MERGE_REQUEST_TARGET_BRANCH_NAME")
            .or_else(|| opt_var("CI_EXTERNAL_PULL_REQUEST_TARGET_BRANCH_NAME")),
        base_revision: None,
        branch: opt_var("CI_MERGE_REQUEST_SOURCE_BRANCH_NAME")
            .or_else(|| opt_var("CI_EXTERNAL_PULL_REQUEST_SOURCE_BRANCH_NAME"))
            .or_else(|| opt_var("CI_COMMIT_BRANCH"))
            .unwrap_or_default(),
        env_prefix: Some("CI_".into()),
        head_revision: None,
        id: var("CI_PIPELINE_ID"),
        provider: CiProvider::Gitlab,
        request_id: opt_var("CI_MERGE_REQUEST_ID"),
        request_url: None,
        revision: var("CI_COMMIT_SHA"),
        url: opt_var("CI_PIPELINE_URL"),
    };

    if opt_var("CI_MERGE_REQUEST_EVENT_TYPE")
        .is_some_and(|value| value == "merged_result" || value == "merge_train")
    {
        ci.base_revision = opt_var("CI_MERGE_REQUEST_DIFF_BASE_SHA")
            .or_else(|| opt_var("CI_EXTERNAL_PULL_REQUEST_TARGET_BRANCH_SHA"));
        ci.head_revision = opt_var("CI_MERGE_REQUEST_SOURCE_BRANCH_SHA")
            .or_else(|| opt_var("CI_EXTERNAL_PULL_REQUEST_SOURCE_BRANCH_SHA"));
    }

    ci
}