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https://github.com/m-lamonaca/json-to-env.git
synced 2025-04-05 10:26:40 +00:00
lock stdout for faster writes
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parent
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SHA256:8db8uii6Gweq7TbKixFBioW2T8CbgtyFETyYL3cr3zk
1 changed files with 220 additions and 221 deletions
441
src/main.rs
441
src/main.rs
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@ -1,221 +1,220 @@
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use std::{
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fmt::Display,
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fs::File,
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io::{BufRead, BufReader, BufWriter, Read, Write},
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};
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use anyhow::{Context, Result};
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use clap::Parser;
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use serde_json::Value;
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fn main() -> Result<()> {
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let args = Args::parse();
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let mut reader: Box<dyn BufRead> = match args.input {
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None => Box::new(std::io::stdin().lock()),
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Some(ref filename) => {
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let file = File::open(filename)
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.with_context(|| format!("Could not open file `{filename}`"))?;
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Box::new(BufReader::new(file))
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}
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};
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let mut buffer = String::new();
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let input = args.input.unwrap_or("STDIN".to_string());
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reader
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.read_to_string(&mut buffer)
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.with_context(|| format!("Could not read `{input}`"))?;
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let json: Value = serde_json::from_str(&buffer)
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.with_context(|| format!("`{input}` does not contain valid JSON"))?;
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let mut vars: Vec<EnvVar> = vec![];
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JsonParser::parse(&mut vars, "", &json, &args.separator);
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let environ = vars
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.iter()
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.map(ToString::to_string)
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.collect::<Vec<String>>()
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.join("\n");
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let mut writer: Box<dyn Write> = match args.output {
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Some(ref filename) => {
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let file = File::create(filename)
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.with_context(|| format!("Could not open file `{filename}`"))?;
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Box::new(BufWriter::new(file))
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}
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None => Box::new(std::io::stdout()),
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};
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let output = args.output.unwrap_or("STDOUT".to_string());
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writer
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.write_all(environ.as_bytes())
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.with_context(|| format!("Could not write to `{output}`"))?;
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Ok(())
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}
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#[derive(Debug, Parser)]
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#[command(name = "json2env", version, about)]
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struct Args {
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/// Input file, defaults to STDIN if not specified
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#[arg(short, long, value_name = "FILE")]
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input: Option<String>,
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/// Output file, defaults to STDOUT if not specified
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#[arg(short, long, value_name = "FILE")]
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output: Option<String>,
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/// Separator for nested keys
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#[arg(short, long, value_name = "STRING", default_value = "__")]
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separator: String,
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}
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struct JsonParser;
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impl JsonParser {
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fn parse(lines: &mut Vec<EnvVar>, key: &str, value: &Value, separator: &str) {
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match value {
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Value::Array(array) => {
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for (index, item) in array.iter().enumerate() {
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let key = Self::build_key(key, index.to_string().as_str(), separator);
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Self::parse(lines, &key, item, separator)
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}
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}
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Value::Object(object) => {
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for (name, value) in object {
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let key = Self::build_key(key, name.as_str(), separator);
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Self::parse(lines, &key, value, separator)
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}
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}
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_ => lines.push(EnvVar(key.trim().to_owned(), value.clone())),
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}
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}
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fn build_key(prefix: &str, key: &str, separator: &str) -> String {
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match prefix.is_empty() {
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true => key.to_string(),
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false => format!("{prefix}{separator}{key}"),
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}
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}
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}
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struct EnvVar(String, Value);
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impl Display for EnvVar {
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fn fmt(&self, fmt: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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match self.1 {
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Value::Null => write!(fmt, "{key}=null", key = self.0),
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Value::Bool(bool) => write!(fmt, "{key}={bool}", key = self.0),
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Value::Number(ref number) => write!(fmt, "{key}={number}", key = self.0),
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Value::String(ref string) => write!(
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fmt,
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r#"{key}="{value}""#,
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key = self.0,
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value = string.replace('"', r#"\""#)
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),
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_ => write!(fmt, ""),
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}
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}
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}
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#[cfg(test)]
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mod tests {
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use serde_json::json;
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use crate::{EnvVar, JsonParser};
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const KEY: &str = r#""key""#;
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#[test]
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fn build_key_should_leave_key_unchanged_when_prefix_is_empty() {
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// ARRANGE
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let separator = "";
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let input = KEY.to_owned();
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let expected = KEY;
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// ACT
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let result = JsonParser::build_key("", &input, separator);
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// ASSERT
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assert_eq!(result, expected);
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}
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#[test]
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fn build_key_should_leave_prepend_prefix_with_separator() {
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// ARRANGE
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let separator = "_";
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let input = KEY.to_owned();
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let expected = format!("prefix{separator}{KEY}");
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// ACT
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let actual = JsonParser::build_key("prefix", &input, separator);
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// ASSERT
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assert_eq!(actual, expected);
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}
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#[test]
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fn bool_env_var_should_be_formatted_correctly() {
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// ARRANGE
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let input = EnvVar(KEY.to_owned(), json!(true));
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// ACT
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let result = input.to_string();
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// ASSERT
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assert_eq!(result, r#""key"=true"#)
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}
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#[test]
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fn numeric_env_var_should_be_formatted_correctly() {
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// ARRANGE
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let input = EnvVar(KEY.to_owned(), json!(1.0));
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// ACT
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let result = input.to_string();
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// ASSERT
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assert_eq!(result, r#""key"=1.0"#)
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}
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#[test]
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fn string_env_var_should_be_formatted_correctly() {
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// ARRANGE
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let input = EnvVar(KEY.to_owned(), json!("hello"));
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// ACT
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let result = input.to_string();
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// ASSERT
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assert_eq!(result, r#""key"="hello""#)
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}
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#[test]
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fn array_env_var_should_be_formatted_correctly() {
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// ARRANGE
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let input = EnvVar(KEY.to_owned(), json!([1, 2]));
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// ACT
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let result = input.to_string();
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// ASSERT
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assert_eq!(result, "")
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}
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#[test]
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fn object_env_var_should_be_formatted_correctly() {
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// ARRANGE
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let input = EnvVar(KEY.to_owned(), json!({ "key": "value" }));
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// ACT
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let result = input.to_string();
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// ASSERT
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assert_eq!(result, "")
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}
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}
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use std::{
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fmt::Display,
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fs::File,
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io::{BufRead, BufReader, BufWriter, Read, Write},
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};
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use anyhow::{Context, Result};
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use clap::Parser;
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use serde_json::Value;
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fn main() -> Result<()> {
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let args = Args::parse();
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let mut reader: Box<dyn BufRead> = match args.input {
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None => Box::new(std::io::stdin().lock()),
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Some(ref filename) => {
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let file = File::open(filename)
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.with_context(|| format!("Could not open file `{filename}`"))?;
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Box::new(BufReader::new(file))
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}
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};
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let mut buffer = String::new();
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let input = args.input.unwrap_or("STDIN".to_string());
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reader
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.read_to_string(&mut buffer)
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.with_context(|| format!("Could not read `{input}`"))?;
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let json: Value = serde_json::from_str(&buffer)
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.with_context(|| format!("`{input}` does not contain valid JSON"))?;
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let mut vars: Vec<EnvVar> = vec![];
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JsonParser::parse(&mut vars, "", &json, &args.separator);
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let environ = vars
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.iter()
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.map(ToString::to_string)
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.collect::<Vec<String>>()
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.join("\n");
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let mut writer: Box<dyn Write> = match args.output {
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None => Box::new(std::io::stdout().lock()),
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Some(ref filename) => {
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let file = File::create(filename)
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.with_context(|| format!("Could not open file `{filename}`"))?;
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Box::new(BufWriter::new(file))
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}
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};
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let output = args.output.unwrap_or("STDOUT".to_string());
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writer
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.write_all(environ.as_bytes())
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.with_context(|| format!("Could not write to `{output}`"))?;
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Ok(())
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}
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#[derive(Debug, Parser)]
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#[command(name = "json2env", version, about)]
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struct Args {
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/// Input file, defaults to STDIN if not specified
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#[arg(short, long, value_name = "FILE")]
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input: Option<String>,
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/// Output file, defaults to STDOUT if not specified
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#[arg(short, long, value_name = "FILE")]
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output: Option<String>,
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/// Separator for nested keys
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#[arg(short, long, value_name = "STRING", default_value = "__")]
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separator: String,
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}
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struct JsonParser;
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impl JsonParser {
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fn parse(lines: &mut Vec<EnvVar>, key: &str, value: &Value, separator: &str) {
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match value {
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Value::Array(array) => {
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for (index, item) in array.iter().enumerate() {
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let key = Self::build_key(key, index.to_string().as_str(), separator);
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Self::parse(lines, &key, item, separator)
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}
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}
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Value::Object(object) => {
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for (name, value) in object {
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let key = Self::build_key(key, name.as_str(), separator);
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Self::parse(lines, &key, value, separator)
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}
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}
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_ => lines.push(EnvVar(key.trim().to_owned(), value.clone())),
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}
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}
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fn build_key(prefix: &str, key: &str, separator: &str) -> String {
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match prefix.is_empty() {
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true => key.to_string(),
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false => format!("{prefix}{separator}{key}"),
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}
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}
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}
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struct EnvVar(String, Value);
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impl Display for EnvVar {
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fn fmt(&self, fmt: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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match self.1 {
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Value::Null => write!(fmt, "{key}=null", key = self.0),
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Value::Bool(bool) => write!(fmt, "{key}={bool}", key = self.0),
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Value::Number(ref number) => write!(fmt, "{key}={number}", key = self.0),
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Value::String(ref string) => write!(
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fmt,
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r#"{key}="{value}""#,
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key = self.0,
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value = string.replace('"', r#"\""#)
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),
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_ => write!(fmt, ""),
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}
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}
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}
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#[cfg(test)]
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mod tests {
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use serde_json::json;
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use crate::{EnvVar, JsonParser};
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const KEY: &str = r#""key""#;
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#[test]
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fn build_key_should_leave_key_unchanged_when_prefix_is_empty() {
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// ARRANGE
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let separator = "";
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let input = KEY.to_owned();
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let expected = KEY;
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// ACT
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let result = JsonParser::build_key("", &input, separator);
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// ASSERT
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assert_eq!(result, expected);
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}
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#[test]
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fn build_key_should_leave_prepend_prefix_with_separator() {
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// ARRANGE
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let separator = "_";
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let input = KEY.to_owned();
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let expected = format!("prefix{separator}{KEY}");
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// ACT
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let actual = JsonParser::build_key("prefix", &input, separator);
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// ASSERT
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assert_eq!(actual, expected);
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}
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#[test]
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fn bool_env_var_should_be_formatted_correctly() {
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// ARRANGE
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let input = EnvVar(KEY.to_owned(), json!(true));
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// ACT
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let result = input.to_string();
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// ASSERT
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assert_eq!(result, r#""key"=true"#)
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}
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#[test]
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fn numeric_env_var_should_be_formatted_correctly() {
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// ARRANGE
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let input = EnvVar(KEY.to_owned(), json!(1.0));
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// ACT
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let result = input.to_string();
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// ASSERT
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assert_eq!(result, r#""key"=1.0"#)
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}
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#[test]
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fn string_env_var_should_be_formatted_correctly() {
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// ARRANGE
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let input = EnvVar(KEY.to_owned(), json!("hello"));
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// ACT
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let result = input.to_string();
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// ASSERT
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assert_eq!(result, r#""key"="hello""#)
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}
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#[test]
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fn array_env_var_should_be_formatted_correctly() {
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// ARRANGE
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let input = EnvVar(KEY.to_owned(), json!([1, 2]));
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// ACT
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let result = input.to_string();
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// ASSERT
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assert_eq!(result, "")
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}
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#[test]
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fn object_env_var_should_be_formatted_correctly() {
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// ARRANGE
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let input = EnvVar(KEY.to_owned(), json!({ "key": "value" }));
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// ACT
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let result = input.to_string();
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// ASSERT
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assert_eq!(result, "")
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}
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}
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