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/*
* libgit2 "cat-file" example - shows how to print data from the ODB
*
* Written by the libgit2 contributors
*
* To the extent possible under law, the author(s) have dedicated all copyright
* and related and neighboring rights to this software to the public domain
* worldwide. This software is distributed without any warranty.
*
* You should have received a copy of the CC0 Public Domain Dedication along
* with this software. If not, see
* <http://creativecommons.org/publicdomain/zero/1.0/>.
*/
#![deny(warnings)]
use std::io::{self, Write};
use clap::Parser;
use git2::{Blob, Commit, ObjectType, Repository, Signature, Tag, Tree};
#[derive(Parser)]
struct Args {
#[structopt(name = "object")]
arg_object: String,
#[structopt(short = 't')]
/// show the object type
flag_t: bool,
#[structopt(short = 's')]
/// show the object size
flag_s: bool,
#[structopt(short = 'e')]
/// suppress all output
flag_e: bool,
#[structopt(short = 'p')]
/// pretty print the contents of the object
flag_p: bool,
#[structopt(name = "quiet", short, long)]
/// suppress output
flag_q: bool,
#[structopt(name = "verbose", short, long)]
flag_v: bool,
#[structopt(name = "dir", long = "git-dir")]
/// use the specified directory as the base directory
flag_git_dir: Option<String>,
}
fn run(args: &Args) -> Result<(), git2::Error> {
let path = args.flag_git_dir.as_ref().map(|s| &s[..]).unwrap_or(".");
let repo = Repository::open(path)?;
let obj = repo.revparse_single(&args.arg_object)?;
if args.flag_v && !args.flag_q {
println!("{} {}\n--", obj.kind().unwrap().str(), obj.id());
}
if args.flag_t {
println!("{}", obj.kind().unwrap().str());
} else if args.flag_s || args.flag_e {
/* ... */
} else if args.flag_p {
match obj.kind() {
Some(ObjectType::Blob) => {
show_blob(obj.as_blob().unwrap());
}
Some(ObjectType::Commit) => {
show_commit(obj.as_commit().unwrap());
}
Some(ObjectType::Tag) => {
show_tag(obj.as_tag().unwrap());
}
Some(ObjectType::Tree) => {
show_tree(obj.as_tree().unwrap());
}
Some(ObjectType::Any) | None => println!("unknown {}", obj.id()),
}
}
Ok(())
}
fn show_blob(blob: &Blob) {
io::stdout().write_all(blob.content()).unwrap();
}
fn show_commit(commit: &Commit) {
println!("tree {}", commit.tree_id());
for parent in commit.parent_ids() {
println!("parent {}", parent);
}
show_sig("author", Some(commit.author()));
show_sig("committer", Some(commit.committer()));
if let Some(msg) = commit.message() {
println!("\n{}", msg);
}
}
fn show_tag(tag: &Tag) {
println!("object {}", tag.target_id());
println!("type {}", tag.target_type().unwrap().str());
println!("tag {}", tag.name().unwrap());
show_sig("tagger", tag.tagger());
if let Some(msg) = tag.message() {
println!("\n{}", msg);
}
}
fn show_tree(tree: &Tree) {
for entry in tree.iter() {
println!(
"{:06o} {} {}\t{}",
entry.filemode(),
entry.kind().unwrap().str(),
entry.id(),
entry.name().unwrap()
);
}
}
fn show_sig(header: &str, sig: Option<Signature>) {
let sig = match sig {
Some(s) => s,
None => return,
};
let offset = sig.when().offset_minutes();
let (sign, offset) = if offset < 0 {
('-', -offset)
} else {
('+', offset)
};
let (hours, minutes) = (offset / 60, offset % 60);
println!(
"{} {} {} {}{:02}{:02}",
header,
sig,
sig.when().seconds(),
sign,
hours,
minutes
);
}
fn main() {
let args = Args::parse();
match run(&args) {
Ok(()) => {}
Err(e) => println!("error: {}", e),
}
}
|
