mod.rs

//! Reading and writing Cargo.toml and package.json manifests.

#![allow(
    clippy::new_ret_no_self,
    clippy::needless_pass_by_value,
    clippy::redundant_closure
)]

mod npm;

use std::fs;
use std::path::Path;

use self::npm::{
    repository::Repository, CommonJSPackage, ESModulesPackage, NoModulesPackage, NpmPackage,
};
use cargo_metadata::Metadata;
use chrono::offset;
use chrono::DateTime;
use command::build::{BuildProfile, Target};
use curl::easy;
use failure::{Error, ResultExt};
use serde::{self, Deserialize};
use serde_json;
use std::collections::BTreeSet;
use std::env;
use std::io::Write;
use strsim::levenshtein;
use toml;
use PBAR;

const WASM_PACK_METADATA_KEY: &str = "package.metadata.wasm-pack";
const WASM_PACK_VERSION: Option<&'static str> = option_env!("CARGO_PKG_VERSION");
const WASM_PACK_REPO_URL: &str = "https://github.com/rustwasm/wasm-pack";

/// Store for metadata learned about a crate
pub struct CrateData {
    data: Metadata,
    current_idx: usize,
    manifest: CargoManifest,
    out_name: Option<String>,
    example: Option<String>,
}

#[doc(hidden)]
#[derive(Deserialize)]
pub struct CargoManifest {
    package: CargoPackage,
}

#[derive(Deserialize)]
struct CargoPackage {
    name: String,
    description: Option<String>,
    license: Option<String>,
    #[serde(rename = "license-file")]
    license_file: Option<String>,
    repository: Option<String>,
    homepage: Option<String>,

    #[serde(default)]
    metadata: CargoMetadata,
}

#[derive(Default, Deserialize)]
struct CargoMetadata {
    #[serde(default, rename = "wasm-pack")]
    wasm_pack: CargoWasmPack,
}

#[derive(Default, Deserialize)]
struct CargoWasmPack {
    #[serde(default)]
    profile: CargoWasmPackProfiles,
}

#[derive(Deserialize)]
struct CargoWasmPackProfiles {
    #[serde(
        default = "CargoWasmPackProfile::default_dev",
        deserialize_with = "CargoWasmPackProfile::deserialize_dev"
    )]
    dev: CargoWasmPackProfile,

    #[serde(
        default = "CargoWasmPackProfile::default_release",
        deserialize_with = "CargoWasmPackProfile::deserialize_release"
    )]
    release: CargoWasmPackProfile,

    #[serde(
        default = "CargoWasmPackProfile::default_profiling",
        deserialize_with = "CargoWasmPackProfile::deserialize_profiling"
    )]
    profiling: CargoWasmPackProfile,
}

impl Default for CargoWasmPackProfiles {
    fn default() -> CargoWasmPackProfiles {
        CargoWasmPackProfiles {
            dev: CargoWasmPackProfile::default_dev(),
            release: CargoWasmPackProfile::default_release(),
            profiling: CargoWasmPackProfile::default_profiling(),
        }
    }
}

/// This is where configuration goes for wasm-bindgen, wasm-opt, wasm-snip, or
/// anything else that wasm-pack runs.
#[derive(Default, Deserialize)]
pub struct CargoWasmPackProfile {
    #[serde(default, rename = "wasm-bindgen")]
    wasm_bindgen: CargoWasmPackProfileWasmBindgen,
    #[serde(default, rename = "wasm-opt")]
    wasm_opt: Option<CargoWasmPackProfileWasmOpt>,
}

#[derive(Default, Deserialize)]
struct CargoWasmPackProfileWasmBindgen {
    #[serde(default, rename = "debug-js-glue")]
    debug_js_glue: Option<bool>,

    #[serde(default, rename = "demangle-name-section")]
    demangle_name_section: Option<bool>,

    #[serde(default, rename = "dwarf-debug-info")]
    dwarf_debug_info: Option<bool>,
}

struct Collector(Vec<u8>);

impl easy::Handler for Collector {
    fn write(&mut self, data: &[u8]) -> Result<usize, easy::WriteError> {
        self.0.extend_from_slice(data);
        Ok(data.len())
    }
}

/// Struct for storing information received from crates.io
#[derive(Deserialize, Debug)]
pub struct Crate {
    #[serde(rename = "crate")]
    crt: CrateInformation,
}

#[derive(Deserialize, Debug)]
struct CrateInformation {
    max_version: String,
}

impl Crate {
    /// Returns latest wasm-pack version
    pub fn return_wasm_pack_latest_version() -> Result<Option<String>, failure::Error> {
        let current_time = chrono::offset::Local::now();
        let old_metadata_file = Self::return_wasm_pack_file();

        match old_metadata_file {
            Some(ref file_contents) => {
                let last_updated = Self::return_stamp_file_value(&file_contents, "created")
                    .and_then(|t| DateTime::parse_from_str(t.as_str(), "%+").ok());

                last_updated
                    .map(|last_updated| {
                        if current_time.signed_duration_since(last_updated).num_hours() > 24 {
                            Self::return_api_call_result(current_time).map(Some)
                        } else {
                            Ok(Self::return_stamp_file_value(&file_contents, "version"))
                        }
                    })
                    .unwrap_or_else(|| Ok(None))
            }
            None => Self::return_api_call_result(current_time).map(Some),
        }
    }

    fn return_api_call_result(
        current_time: DateTime<offset::Local>,
    ) -> Result<String, failure::Error> {
        let version = Self::return_latest_wasm_pack_version();

        // We always override the stamp file with the current time because we don't
        // want to hit the API all the time if it fails. It should follow the same
        // "policy" as the success. This means that the 24 hours rate limiting
        // will be active regardless if the check succeeded or failed.
        match version {
            Ok(ref version) => Self::override_stamp_file(current_time, Some(&version)).ok(),
            Err(_) => Self::override_stamp_file(current_time, None).ok(),
        };

        version
    }

    fn override_stamp_file(
        current_time: DateTime<offset::Local>,
        version: Option<&str>,
    ) -> Result<(), failure::Error> {
        let path = env::current_exe()?;

        let mut file = fs::OpenOptions::new()
            .read(true)
            .write(true)
            .append(true)
            .create(true)
            .open(path.with_extension("stamp"))?;

        file.set_len(0)?;

        write!(file, "created {:?}", current_time)?;

        if let Some(version) = version {
            write!(file, "\nversion {}", version)?;
        }

        Ok(())
    }

    /// Return stamp file where metadata is stored.
    fn return_wasm_pack_file() -> Option<String> {
        if let Ok(path) = env::current_exe() {
            if let Ok(file) = fs::read_to_string(path.with_extension("stamp")) {
                return Some(file);
            }
        }
        None
    }

    /// Returns wasm-pack latest version (if it's received) by executing check_wasm_pack_latest_version function.
    fn return_latest_wasm_pack_version() -> Result<String, failure::Error> {
        Self::check_wasm_pack_latest_version().map(|crt| crt.crt.max_version)
    }

    /// Read the stamp file and return value assigned to a certain key.
    fn return_stamp_file_value(file: &str, word: &str) -> Option<String> {
        let created = file
            .lines()
            .find(|line| line.starts_with(word))
            .and_then(|l| l.split_whitespace().nth(1));

        created.map(|s| s.to_string())
    }

    /// Call to the crates.io api and return the latest version of `wasm-pack`
    fn check_wasm_pack_latest_version() -> Result<Crate, Error> {
        let url = "https://crates.io/api/v1/crates/wasm-pack";

        let mut easy = easy::Easy2::new(Collector(Vec::new()));

        easy.useragent(&format!(
            "wasm-pack/{} ({})",
            WASM_PACK_VERSION.unwrap_or_else(|| "unknown"),
            WASM_PACK_REPO_URL
        ))?;

        easy.url(url)?;
        easy.get(true)?;
        easy.perform()?;

        let status_code = easy.response_code()?;

        if 200 <= status_code && status_code < 300 {
            let contents = easy.get_ref();
            let result = String::from_utf8_lossy(&contents.0);

            Ok(serde_json::from_str(result.into_owned().as_str())?)
        } else {
            bail!(
                "Received a bad HTTP status code ({}) when checking for newer wasm-pack version at: {}",
                status_code,
                url
            )
        }
    }
}

#[derive(Clone, Deserialize)]
#[serde(untagged)]
enum CargoWasmPackProfileWasmOpt {
    Enabled(bool),
    ExplicitArgs(Vec<String>),
}

impl Default for CargoWasmPackProfileWasmOpt {
    fn default() -> Self {
        CargoWasmPackProfileWasmOpt::Enabled(false)
    }
}

impl CargoWasmPackProfile {
    fn default_dev() -> Self {
        CargoWasmPackProfile {
            wasm_bindgen: CargoWasmPackProfileWasmBindgen {
                debug_js_glue: Some(true),
                demangle_name_section: Some(true),
                dwarf_debug_info: Some(false),
            },
            wasm_opt: None,
        }
    }

    fn default_release() -> Self {
        CargoWasmPackProfile {
            wasm_bindgen: CargoWasmPackProfileWasmBindgen {
                debug_js_glue: Some(false),
                demangle_name_section: Some(true),
                dwarf_debug_info: Some(false),
            },
            wasm_opt: Some(CargoWasmPackProfileWasmOpt::Enabled(true)),
        }
    }

    fn default_profiling() -> Self {
        CargoWasmPackProfile {
            wasm_bindgen: CargoWasmPackProfileWasmBindgen {
                debug_js_glue: Some(false),
                demangle_name_section: Some(true),
                dwarf_debug_info: Some(false),
            },
            wasm_opt: Some(CargoWasmPackProfileWasmOpt::Enabled(true)),
        }
    }

    fn deserialize_dev<'de, D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: serde::Deserializer<'de>,
    {
        let mut profile = <Option<Self>>::deserialize(deserializer)?.unwrap_or_default();
        profile.update_with_defaults(&Self::default_dev());
        Ok(profile)
    }

    fn deserialize_release<'de, D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: serde::Deserializer<'de>,
    {
        let mut profile = <Option<Self>>::deserialize(deserializer)?.unwrap_or_default();
        profile.update_with_defaults(&Self::default_release());
        Ok(profile)
    }

    fn deserialize_profiling<'de, D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: serde::Deserializer<'de>,
    {
        let mut profile = <Option<Self>>::deserialize(deserializer)?.unwrap_or_default();
        profile.update_with_defaults(&Self::default_profiling());
        Ok(profile)
    }

    fn update_with_defaults(&mut self, defaults: &Self) {
        macro_rules! d {
            ( $( $path:ident ).* ) => {
                self. $( $path ).* .get_or_insert(defaults. $( $path ).* .unwrap());
            }
        }
        d!(wasm_bindgen.debug_js_glue);
        d!(wasm_bindgen.demangle_name_section);
        d!(wasm_bindgen.dwarf_debug_info);

        if self.wasm_opt.is_none() {
            self.wasm_opt = defaults.wasm_opt.clone();
        }
    }

    /// Get this profile's configured `[wasm-bindgen.debug-js-glue]` value.
    pub fn wasm_bindgen_debug_js_glue(&self) -> bool {
        self.wasm_bindgen.debug_js_glue.unwrap()
    }

    /// Get this profile's configured `[wasm-bindgen.demangle-name-section]` value.
    pub fn wasm_bindgen_demangle_name_section(&self) -> bool {
        self.wasm_bindgen.demangle_name_section.unwrap()
    }

    /// Get this profile's configured `[wasm-bindgen.dwarf-debug-info]` value.
    pub fn wasm_bindgen_dwarf_debug_info(&self) -> bool {
        self.wasm_bindgen.dwarf_debug_info.unwrap()
    }

    /// Get this profile's configured arguments for `wasm-opt`, if enabled.
    pub fn wasm_opt_args(&self) -> Option<Vec<String>> {
        match self.wasm_opt.as_ref()? {
            CargoWasmPackProfileWasmOpt::Enabled(false) => None,
            CargoWasmPackProfileWasmOpt::Enabled(true) => Some(vec!["-O".to_string()]),
            CargoWasmPackProfileWasmOpt::ExplicitArgs(s) => Some(s.clone()),
        }
    }
}

struct NpmData {
    name: String,
    files: Vec<String>,
    dts_file: Option<String>,
    main: String,
    homepage: Option<String>, // https://docs.npmjs.com/files/package.json#homepage
}

#[doc(hidden)]
pub struct ManifestAndUnsedKeys {
    pub manifest: CargoManifest,
    pub unused_keys: BTreeSet<String>,
}

impl CrateData {
    /// Reads all metadata for the crate whose manifest is inside the directory
    /// specified by `path`.
    pub fn new(
        crate_path: &Path,
        out_name: Option<String>,
        example: Option<String>,
    ) -> Result<CrateData, Error> {
        let manifest_path = crate_path.join("Cargo.toml");
        if !manifest_path.is_file() {
            bail!(
                "crate directory is missing a `Cargo.toml` file; is `{}` the \
                 wrong directory?",
                crate_path.display()
            )
        }

        let data = cargo_metadata::MetadataCommand::new()
            .manifest_path(&manifest_path)
            .exec()?;

        let manifest_and_keys = CrateData::parse_crate_data(&manifest_path)?;
        CrateData::warn_for_unused_keys(&manifest_and_keys);

        let manifest = manifest_and_keys.manifest;
        let current_idx = data
            .packages
            .iter()
            .position(|pkg| pkg.name == manifest.package.name)
            .ok_or_else(|| format_err!("failed to find package in metadata"))?;

        Ok(CrateData {
            data,
            manifest,
            current_idx,
            out_name,
            example,
        })
    }

    /// Read the `manifest_path` file and deserializes it using the toml Deserializer.
    /// Returns a Result containing `ManifestAndUnsedKeys` which contains `CargoManifest`
    /// and a `BTreeSet<String>` containing the unused keys from the parsed file.
    ///
    /// # Errors
    /// Will return Err if the file (manifest_path) couldn't be read or
    /// if deserialize to `CargoManifest` fails.
    pub fn parse_crate_data(manifest_path: &Path) -> Result<ManifestAndUnsedKeys, Error> {
        let manifest = fs::read_to_string(&manifest_path)
            .with_context(|_| format!("failed to read: {}", manifest_path.display()))?;
        let manifest = &mut toml::Deserializer::new(&manifest);

        let mut unused_keys = BTreeSet::new();
        let levenshtein_threshold = 1;

        let manifest: CargoManifest = serde_ignored::deserialize(manifest, |path| {
            let path_string = path.to_string();

            if path_string.starts_with("package.metadata")
                && (path_string.contains("wasm-pack")
                    || levenshtein(WASM_PACK_METADATA_KEY, &path_string) <= levenshtein_threshold)
            {
                unused_keys.insert(path_string);
            }
        })
        .with_context(|_| format!("failed to parse manifest: {}", manifest_path.display()))?;

        Ok(ManifestAndUnsedKeys {
            manifest,
            unused_keys,
        })
    }

    /// Iterating through all the passed `unused_keys` and output
    /// a warning for each unknown key.
    pub fn warn_for_unused_keys(manifest_and_keys: &ManifestAndUnsedKeys) {
        manifest_and_keys.unused_keys.iter().for_each(|path| {
            PBAR.warn(&format!(
                "\"{}\" is an unknown key and will be ignored. Please check your Cargo.toml.",
                path
            ));
        });
    }

    /// Get the configured profile.
    pub fn configured_profile(&self, profile: BuildProfile) -> &CargoWasmPackProfile {
        match profile {
            BuildProfile::Dev => &self.manifest.package.metadata.wasm_pack.profile.dev,
            BuildProfile::Profiling => &self.manifest.package.metadata.wasm_pack.profile.profiling,
            BuildProfile::Release => &self.manifest.package.metadata.wasm_pack.profile.release,
        }
    }

    /// Check that the crate the given path is properly configured.
    pub fn check_crate_config(&self) -> Result<(), Error> {
        self.check_crate_type()?;
        Ok(())
    }

    fn valid_targets(&self) -> impl Iterator<Item = &cargo_metadata::Target> {
        fn valid(target: &cargo_metadata::Target, example: &Option<String>) -> bool {
            if let Some(example) = example {
                target.name == *example && target.kind.iter().any(|k| k == "example")
            } else {
                fn valid_kind(x: &str) -> bool {
                    x == "cdylib" || x == "bin"
                }
                target.kind.iter().any(|x| valid_kind(x))
            }
        }
        let pkg = &self.data.packages[self.current_idx];
        pkg.targets
            .iter()
            .filter(move |target| valid(target, &self.example))
    }

    fn check_crate_type(&self) -> Result<(), Error> {
        let any_valid = self.valid_targets().count() > 0;
        if any_valid {
            return Ok(());
        }
        bail!(
            "library crate-type must be cdylib to compile to wasm32-unknown-unknown. Add the following to your \
             Cargo.toml file:\n\n\
             [lib]\n\
             crate-type = [\"cdylib\", \"rlib\"]"
        )
    }

    /// Get the crate name for the crate at the given path.
    pub fn crate_name(&self) -> String {
        let pkg = &self.data.packages[self.current_idx];
        match pkg
            .targets
            .iter()
            .find(|t| t.kind.iter().any(|k| k == "cdylib"))
        {
            Some(lib) => lib.name.replace("-", "_"),
            None => pkg.name.replace("-", "_"),
        }
    }

    /// Get the target names that will be built for the current crate.
    pub fn targets(&self) -> impl Iterator<Item = String> + '_ {
        self.valid_targets().map(|x| {
            if x.kind.iter().any(|x| x.ends_with("lib")) {
                x.name.replace("-", "_")
            } else {
                x.name.clone()
            }
        })
    }

    /// Check if we are building an example.
    pub fn is_example(&self) -> bool {
        self.example.is_some()
    }

    /// Get the prefix for output file names
    pub fn name_prefix(&self) -> String {
        match &self.out_name {
            Some(value) => value.clone(),
            None => self.crate_name(),
        }
    }

    /// Get the license for the crate at the given path.
    pub fn crate_license(&self) -> &Option<String> {
        &self.manifest.package.license
    }

    /// Get the license file path for the crate at the given path.
    pub fn crate_license_file(&self) -> &Option<String> {
        &self.manifest.package.license_file
    }

    /// Returns the path to this project's target directory where artifacts are
    /// located after a cargo build.
    pub fn target_directory(&self) -> &Path {
        Path::new(&self.data.target_directory)
    }

    /// Returns the path to this project's root cargo workspace directory
    pub fn workspace_root(&self) -> &Path {
        Path::new(&self.data.workspace_root)
    }

    /// Generate a package.json file inside in `./pkg`.
    pub fn write_package_json(
        &self,
        out_dir: &Path,
        scope: &Option<String>,
        disable_dts: bool,
        target: Target,
    ) -> Result<(), Error> {
        let pkg_file_path = out_dir.join("package.json");
        let npm_data = match target {
            Target::Nodejs => self.to_commonjs(scope, disable_dts, out_dir),
            Target::NoModules => self.to_nomodules(scope, disable_dts, out_dir),
            Target::Bundler => self.to_esmodules(scope, disable_dts, out_dir),
            Target::Web => self.to_web(scope, disable_dts, out_dir),
        };

        let npm_json = serde_json::to_string_pretty(&npm_data)?;
        fs::write(&pkg_file_path, npm_json)
            .with_context(|_| format!("failed to write: {}", pkg_file_path.display()))?;
        Ok(())
    }

    fn npm_data(
        &self,
        scope: &Option<String>,
        include_commonjs_shim: bool,
        disable_dts: bool,
        out_dir: &Path,
    ) -> NpmData {
        let name_prefix = self.name_prefix();
        let wasm_file = format!("{}_bg.wasm", name_prefix);
        let js_file = format!("{}.js", name_prefix);
        let mut files = vec![wasm_file];

        files.push(js_file.clone());
        if include_commonjs_shim {
            let js_bg_file = format!("{}_bg.js", name_prefix);
            files.push(js_bg_file.to_string());
        }

        let pkg = &self.data.packages[self.current_idx];
        let npm_name = match scope {
            Some(s) => format!("@{}/{}", s, pkg.name),
            None => pkg.name.clone(),
        };

        let dts_file = if !disable_dts {
            let file = format!("{}.d.ts", name_prefix);
            files.push(file.to_string());
            Some(file)
        } else {
            None
        };

        if let Ok(entries) = fs::read_dir(out_dir) {
            let file_names = entries
                .filter_map(|e| e.ok())
                .filter(|e| e.metadata().map(|m| m.is_file()).unwrap_or(false))
                .filter_map(|e| e.file_name().into_string().ok())
                .filter(|f| f.starts_with("LICENSE"))
                .filter(|f| f != "LICENSE");
            for file_name in file_names {
                files.push(file_name);
            }
        }

        NpmData {
            name: npm_name,
            dts_file,
            files,
            main: js_file,
            homepage: self.manifest.package.homepage.clone(),
        }
    }

    fn license(&self) -> Option<String> {
        self.manifest.package.license.clone().or_else(|| {
            self.manifest.package.license_file.clone().map(|file| {
                // When license is written in file: https://docs.npmjs.com/files/package.json#license
                format!("SEE LICENSE IN {}", file)
            })
        })
    }

    fn to_commonjs(&self, scope: &Option<String>, disable_dts: bool, out_dir: &Path) -> NpmPackage {
        let data = self.npm_data(scope, true, disable_dts, out_dir);
        let pkg = &self.data.packages[self.current_idx];

        self.check_optional_fields();

        NpmPackage::CommonJSPackage(CommonJSPackage {
            name: data.name,
            collaborators: pkg.authors.clone(),
            description: self.manifest.package.description.clone(),
            version: pkg.version.to_string(),
            license: self.license(),
            repository: self
                .manifest
                .package
                .repository
                .clone()
                .map(|repo_url| Repository {
                    ty: "git".to_string(),
                    url: repo_url,
                }),
            files: data.files,
            main: data.main,
            homepage: data.homepage,
            types: data.dts_file,
        })
    }

    fn to_esmodules(
        &self,
        scope: &Option<String>,
        disable_dts: bool,
        out_dir: &Path,
    ) -> NpmPackage {
        let data = self.npm_data(scope, false, disable_dts, out_dir);
        let pkg = &self.data.packages[self.current_idx];

        self.check_optional_fields();

        NpmPackage::ESModulesPackage(ESModulesPackage {
            name: data.name,
            collaborators: pkg.authors.clone(),
            description: self.manifest.package.description.clone(),
            version: pkg.version.to_string(),
            license: self.license(),
            repository: self
                .manifest
                .package
                .repository
                .clone()
                .map(|repo_url| Repository {
                    ty: "git".to_string(),
                    url: repo_url,
                }),
            files: data.files,
            module: data.main,
            homepage: data.homepage,
            types: data.dts_file,
            side_effects: false,
        })
    }

    fn to_web(&self, scope: &Option<String>, disable_dts: bool, out_dir: &Path) -> NpmPackage {
        let data = self.npm_data(scope, false, disable_dts, out_dir);
        let pkg = &self.data.packages[self.current_idx];

        self.check_optional_fields();

        NpmPackage::ESModulesPackage(ESModulesPackage {
            name: data.name,
            collaborators: pkg.authors.clone(),
            description: self.manifest.package.description.clone(),
            version: pkg.version.to_string(),
            license: self.license(),
            repository: self
                .manifest
                .package
                .repository
                .clone()
                .map(|repo_url| Repository {
                    ty: "git".to_string(),
                    url: repo_url,
                }),
            files: data.files,
            module: data.main,
            homepage: data.homepage,
            types: data.dts_file,
            side_effects: false,
        })
    }

    fn to_nomodules(
        &self,
        scope: &Option<String>,
        disable_dts: bool,
        out_dir: &Path,
    ) -> NpmPackage {
        let data = self.npm_data(scope, false, disable_dts, out_dir);
        let pkg = &self.data.packages[self.current_idx];

        self.check_optional_fields();

        NpmPackage::NoModulesPackage(NoModulesPackage {
            name: data.name,
            collaborators: pkg.authors.clone(),
            description: self.manifest.package.description.clone(),
            version: pkg.version.to_string(),
            license: self.license(),
            repository: self
                .manifest
                .package
                .repository
                .clone()
                .map(|repo_url| Repository {
                    ty: "git".to_string(),
                    url: repo_url,
                }),
            files: data.files,
            browser: data.main,
            homepage: data.homepage,
            types: data.dts_file,
        })
    }

    fn check_optional_fields(&self) {
        let mut messages = vec![];
        if self.manifest.package.description.is_none() {
            messages.push("description");
        }
        if self.manifest.package.repository.is_none() {
            messages.push("repository");
        }
        if self.manifest.package.license.is_none() && self.manifest.package.license_file.is_none() {
            messages.push("license");
        }

        match messages.len() {
            1 => PBAR.info(&format!("Optional field missing from Cargo.toml: '{}'. This is not necessary, but recommended", messages[0])),
            2 => PBAR.info(&format!("Optional fields missing from Cargo.toml: '{}', '{}'. These are not necessary, but recommended", messages[0], messages[1])),
            3 => PBAR.info(&format!("Optional fields missing from Cargo.toml: '{}', '{}', and '{}'. These are not necessary, but recommended", messages[0], messages[1], messages[2])),
            _ => ()
        };
    }
}