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scaffold the CLI, logging and turn research into TODOs

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kalmenn 2026-02-01 17:23:35 +01:00
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[alias]
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/target

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`git-identity` manages part of your git configuration to easily switch between different identities
(personal, university, work1, work2, ...), each with their own settings.
Identities can be automatically imported from a GPG key with the `git-identity import` command.
Once an identity is applied with `git-identity use`, the following configuration options will be set
for the local git repository:
```.git/config
[core]
sshCommand = "ssh -i $authkey -o IdentitiesOnly=yes"
[user]
name = $name
email = $email
signingKey = $sigkey
```

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# Subcommands
## import
Import an identity from a gpg key.
Relevant crates:
```Cargo.toml
# For finding the cache directory in which to store the SSH keys exported from GPG and identities
dirs = "6.0.0"
# For importing GPG keys
gpgme = "0.11.0"
# For reading/writing identities' files
serde = { version = "1.0.228", features = ["derive"] }
toml = "0.9.11"
```
## use
Set the identity of the current git repo
Relevant crates:
```Cargo.toml
# For writing to the local git config as well as to allow configuring git-identity from git
git2 = { version = "0.20.3", default-features = false }
```
## show
Show a saved identity or the identity that's currently effective
## delete
Remove a saved identity
## list
List all saved identities
## edit
Interactively edit a saved identity (or in a text editor when using a specific flag)
# User input
[inquire](https://docs.rs/inquire/latest/inquire/) seems simple enough. But
[dialoguer](https://docs.rs/dialoguer/latest/dialoguer/) is the one use by tauri which seems much
more complete.
# Completions
clap_complete does that statically. It will be able to do it dynamically once the
[Rust-Native Completion Engine (#3166)](https://github.com/clap-rs/clap/issues/3166) feature lands

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//! The Command Line Interface definition to the git-identity subcommand
use clap::{ArgAction, Args, Parser, Subcommand};
/// Manages multiple identities (e.g. personal, work, university, ...) in git repos for you.
#[derive(Parser, Debug)]
pub struct Cli {
#[command(flatten)]
pub global: GlobalArgs,
#[command(subcommand)]
pub command: Command,
}
impl Cli {
pub fn run_subcommand(self) -> anyhow::Result<()> {
match self.command {
Command::SayHello(cli) => crate::subcommands::say_hello::main(self.global, cli),
}
}
}
/// Global arguments (not specific to any subcommand)
#[derive(Args, Debug)]
pub struct GlobalArgs {
/// Increases the verbosity of the log outputs
///
/// The RUST_LOG environment variable takes priority if both are specified.
#[arg(short, long = "verbose", action = ArgAction::Count)]
pub verbosity: u8,
}
#[derive(Subcommand, Debug)]
pub enum Command {
SayHello(SayHelloCli),
}
/// A temporary subcommand for testing the cli
#[derive(Parser, Debug)]
pub struct SayHelloCli {
pub name: String,
}

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//! This crate is not a library but we need some things to be exported so that they can be read by
//! cargo xtasks
pub mod cli;
pub mod logging;
pub mod subcommands;

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use tracing::Level;
use tracing_subscriber::{Layer as _, layer::SubscriberExt as _, util::SubscriberInitExt as _};
pub const DEFAULT_LOG_LEVEL: Level = if cfg!(debug_assertions) {
Level::DEBUG // debug builds
} else {
Level::WARN // release builds
};
fn level_to_index(level: Level) -> u8 {
match level {
Level::TRACE => 0,
Level::DEBUG => 1,
Level::INFO => 2,
Level::WARN => 3,
Level::ERROR => 4,
}
}
fn index_to_level(index: u8) -> Level {
match index {
0 => Level::TRACE,
1 => Level::DEBUG,
2 => Level::INFO,
3 => Level::WARN,
4.. => Level::ERROR,
}
}
fn level_from_verbosity(verbosity: u8) -> Level {
index_to_level(level_to_index(DEFAULT_LOG_LEVEL).saturating_sub(verbosity))
}
pub fn init_tracing(verbosity: u8) -> anyhow::Result<()> {
let terminal_layer = tracing_subscriber::fmt::layer()
.without_time()
.compact()
.boxed();
let level = level_from_verbosity(verbosity);
tracing_subscriber::registry()
.with(terminal_layer)
.with(
tracing_subscriber::EnvFilter::builder()
.with_default_directive(level.into())
.from_env()?,
)
.init();
tracing::info!("logging with level {level}");
Ok(())
}

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use clap::Parser as _;
use git_identity::{cli, logging};
fn main() -> anyhow::Result<()> {
let cli = cli::Cli::parse();
logging::init_tracing(cli.global.verbosity)?;
cli.run_subcommand()
}

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pub mod say_hello;

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pub fn main(
_global_args: crate::cli::GlobalArgs,
cli: crate::cli::SayHelloCli,
) -> anyhow::Result<()> {
println!("Hello {}!", cli.name);
Ok(())
}

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[package]
name = "xtask"
version = "0.1.0"
edition.workspace = true
license.workspace = true
[dependencies]
anyhow.workspace = true
clap.workspace = true
clap_mangen = "0.2.31"
git-identity = { path = "../" }

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use clap::{Parser, Subcommand};
mod manpage;
#[derive(Parser)]
struct Cli {
#[command(subcommand)]
pub command: Command,
}
#[derive(Subcommand)]
enum Command {
Manpage(manpage::Cli),
}
fn main() -> anyhow::Result<()> {
let cli = Cli::parse();
match cli.command {
Command::Manpage(cli) => manpage::main(cli),
}
}

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use std::path::PathBuf;
use clap::{CommandFactory as _, Parser};
/// Render the manpage of git-identity from its clap definition
#[derive(Parser)]
pub struct Cli {
/// The file in which to write the newly generated manpage
///
/// By default, this is "target/git-identity.1"
out_file: Option<PathBuf>,
}
pub fn main(cli: Cli) -> anyhow::Result<()> {
let man = clap_mangen::Man::new(git_identity::cli::Cli::command());
let mut buffer: Vec<u8> = Default::default();
man.render(&mut buffer)?;
std::fs::write(
cli.out_file.unwrap_or_else(|| "./target/git-identity.1".into()),
buffer,
)?;
Ok(())
}