26 posts tagged with "rust"

Create the table in Postgres​

CREATE TYPE gender AS ENUM('female', 'male', 'unknown');

CREATE TABLE user_info(
    email varchar(128) NOT NULL PRIMARY KEY,
    name varchar(64) NOT NULL,
    gender gender DEFAULT 'unknown',
);

Fake crate​

use Fake crate to generate fake data.

[dependencies]
rng = "0.1.0"
rand = "0.8.5"
nanoid = "0.4.0"
fake = { version="2.9.2", features=["derive", "chrono"]}

the crate​

[dependencies]
sha1-checked = "0.10.0"
base16ct = { version="0.2.0", features=["alloc"] }

Generate SHA1 Hash bytes​

• build sha1 hasher with Sha1::new()
• update the hasher with hasher.update(content)
• call hasher.try_finalize() to get the hash
• generate hash bytes with

let arr = hf.hash();
arr.to_vec()

Add add sub-commmand​

#[derive(Debug, Subcommand)]
pub enum GitSubCommand {
    #[command(name = "init", about = "init a git repo")]
    Init(InitOpts),
    #[command(name = "add", about = "add files into index")]
    Add(AddOpts),
}

What is Git​

We use git to manage our code, and do version control.

• generally, I use git init or git clone to start a project locally.
• And do some work in the git repo.
• And then use git add to add the files to the staging area.
• And then use git commit to commit the changes to the local repository.
• And then use git push to push the files to the remote repository.
• And then use git pull origin master to pull the changes from the remote repository.
• use git checkout -b <new_branch> to create and checkout to a new branch.
• use git rebase master to rebase changes from master to the current branch.

What is Json​

What is Json

JSON (JavaScript Object Notation) is a lightweight data-interchange format. It is easy for humans to read and write. It is easy for machines to parse and generate. It is based on a subset of the JavaScript Programming Language Standard ECMA-262 3rd Edition - December 1999.

How to Deduplicate the elements in a Vector​

First Version​

in the first version of the deduplicate:

• First create data_set to matain the data exists state.
• Iter over the data and check if the specific data in idx is exists
• If exists then skip.
• If not exists then push the data to new result: dedup_data.

use clap to build a cli App​

So, I want to build a Cli App that convert a csv file to json, yaml, toml formated file.

And for Rust, there is crate clap was used to build cli app.

And the final command to use the cli app, is something like this:

./target/debug/rcli csv -i test.csv

Delete words backward​

• delete 1 word: db
• delete n words: d<number>b

Delete word forward​

• dw: delete one word.

Change the current word inpalce​

• cw: chagne the current word