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Use clap::ArgEnum to auto-generate possible cli arguments from Rust enums #10369

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Use clap::ArgEnum to auto-generate possible cli arguments from Rust enums #10369

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30bd2d8
Use clap-generated possible values in ConfigFormat
petr-tik Jan 13, 2022
ec80cda
Replace static list of strings with clap::ArgEnum
petr-tik Feb 7, 2022
672dcde
Use a Result-returning clap method to prevent
petr-tik Feb 8, 2022
5b1a975
Prevent typos and the need for tests
petr-tik Feb 8, 2022
8879d98
Derive the same traits in the same order types
petr-tik Feb 8, 2022
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2 changes: 1 addition & 1 deletion Cargo.toml
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Expand Up @@ -61,7 +61,7 @@ toml_edit = { version = "0.13.4", features = ["serde", "easy"] }
unicode-xid = "0.2.0"
url = "2.2.2"
walkdir = "2.2"
clap = "3.1.0"
clap = { version = "3.1.0", features = ["derive"] }
unicode-width = "0.1.5"
openssl = { version = '0.10.11', optional = true }
im-rc = "15.0.0"
Expand Down
6 changes: 3 additions & 3 deletions src/bin/cargo/commands/config.rs
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Expand Up @@ -12,8 +12,8 @@ pub fn cli() -> App {
.arg(Arg::new("key").help("The config key to display"))
.arg(
opt("format", "Display format")
.possible_values(cargo_config::ConfigFormat::POSSIBLE_VALUES)
.default_value("toml"),
.possible_values(cargo_config::ConfigFormat::possible_values())
.default_value(cargo_config::ConfigFormat::Toml.as_ref()),
)
.arg(opt(
"show-origin",
Expand All @@ -35,7 +35,7 @@ pub fn exec(config: &mut Config, args: &ArgMatches) -> CliResult {
Some(("get", args)) => {
let opts = cargo_config::GetOptions {
key: args.value_of("key"),
format: args.value_of("format").unwrap().parse()?,
format: args.value_of_t("format")?,
show_origin: args.is_present("show-origin"),
merged: args.value_of("merged") == Some("yes"),
};
Expand Down
11 changes: 5 additions & 6 deletions src/bin/cargo/commands/tree.rs
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Expand Up @@ -68,8 +68,8 @@ pub fn cli() -> App {
"Change the prefix (indentation) of how each entry is displayed",
)
.value_name("PREFIX")
.possible_values(&["depth", "indent", "none"])
.default_value("indent"),
.possible_values(tree::Prefix::possible_values())
.default_value(tree::Prefix::Indent.as_ref()),
)
.arg(opt(
"no-dedupe",
Expand Down Expand Up @@ -113,16 +113,15 @@ pub fn exec(config: &mut Config, args: &ArgMatches) -> CliResult {
config
.shell()
.warn("the --no-indent flag has been changed to --prefix=none")?;
"none"
tree::Prefix::None
} else if args.is_present("prefix-depth") {
config
.shell()
.warn("the --prefix-depth flag has been changed to --prefix=depth")?;
"depth"
tree::Prefix::Depth
} else {
args.value_of("prefix").unwrap()
args.value_of_t("prefix")?
};
let prefix = tree::Prefix::from_str(prefix).map_err(|e| anyhow::anyhow!("{}", e))?;

let no_dedupe = args.is_present("no-dedupe") || args.is_present("all");
if args.is_present("all") {
Expand Down
29 changes: 22 additions & 7 deletions src/cargo/ops/cargo_config.rs
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Expand Up @@ -4,20 +4,25 @@ use crate::util::config::{Config, ConfigKey, ConfigValue as CV, Definition};
use crate::util::errors::CargoResult;
use crate::{drop_eprintln, drop_println};
use anyhow::{bail, format_err, Error};
use clap::{ArgEnum, PossibleValue};
use serde_json::json;
use std::borrow::Cow;
use std::fmt;
use std::str::FromStr;

#[derive(clap::ArgEnum, Copy, Clone)]
pub enum ConfigFormat {
Toml,
Json,
JsonValue,
}

impl ConfigFormat {
/// For clap.
pub const POSSIBLE_VALUES: &'static [&'static str] = &["toml", "json", "json-value"];
pub fn possible_values() -> impl Iterator<Item = PossibleValue<'static>> {
ConfigFormat::value_variants()
.iter()
.filter_map(ArgEnum::to_possible_value)
}
}

impl FromStr for ConfigFormat {
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If we move forward with this, we should switch the FromStrs to be implemented in terms of ArgEnum as well

For example, clap_completes Shell:

impl FromStr for Shell {
    type Err = String;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        for variant in Self::value_variants() {
            if variant.to_possible_value().expect("No value is skipped").matches(s, false) {
                return Ok(*variant);
            }
        }
        Err(format!("Invalid variant: {}", s))
    }
}

Expand All @@ -34,11 +39,21 @@ impl FromStr for ConfigFormat {

impl fmt::Display for ConfigFormat {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match *self {
ConfigFormat::Toml => write!(f, "toml"),
ConfigFormat::Json => write!(f, "json"),
ConfigFormat::JsonValue => write!(f, "json-value"),
}
write!(
f,
"{}",
self.to_possible_value()
.expect("No value is skipped")
.get_name()
)
}
}

impl AsRef<str> for ConfigFormat {
fn as_ref(&self) -> &str {
self.to_possible_value()
.expect("No value is skipped")
.get_name()
}
}

Expand Down
19 changes: 18 additions & 1 deletion src/cargo/ops/tree/mod.rs
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Expand Up @@ -9,6 +9,7 @@ use crate::ops::{self, Packages};
use crate::util::{CargoResult, Config};
use crate::{drop_print, drop_println};
use anyhow::Context;
use clap::{ArgEnum, PossibleValue};
use graph::Graph;
use std::collections::{HashMap, HashSet};
use std::str::FromStr;
Expand Down Expand Up @@ -85,13 +86,21 @@ impl FromStr for Charset {
}
}

#[derive(Clone, Copy)]
#[derive(clap::ArgEnum, Copy, Clone)]
pub enum Prefix {
None,
Indent,
Depth,
}

impl Prefix {
pub fn possible_values() -> impl Iterator<Item = PossibleValue<'static>> {
Prefix::value_variants()
.iter()
.filter_map(ArgEnum::to_possible_value)
}
}

impl FromStr for Prefix {
type Err = &'static str;

Expand All @@ -105,6 +114,14 @@ impl FromStr for Prefix {
}
}

impl AsRef<str> for Prefix {
fn as_ref(&self) -> &str {
self.to_possible_value()
.expect("No value is skipped")
.get_name()
}
}

struct Symbols {
down: &'static str,
tee: &'static str,
Expand Down