commit c38f59c327f62b5d0636779a94f8ab44da7aa829
Author: Marcello Lamonaca <marcello@lamonaca.eu>
Date:   Wed Jun 7 18:13:52 2023 +0200

    Initial Commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..0fb04b1
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,357 @@
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..09b4aa0
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "json2env"
+version = "0.1.0"
+edition = "2021"
+authors = ["Marcello Lamonaca <marcello@lamonaca.eu>"]
+description = "JSON to Env Var converter"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+anyhow = "1.0.71"
+clap = { version = "4.3.2", features = ["derive", "color"] }
+serde_json = "1.0.96"
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..7cbe5d9
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,121 @@
+use std::{
+    fmt::Display,
+    fs::File,
+    io::{Read, Write},
+};
+
+use anyhow::{Context, Result};
+use clap::{Parser};
+use serde_json::Value;
+
+fn main() -> Result<()> {
+    let args = Args::parse();
+
+    let mut reader: Box<dyn Read> = match args.input {
+        Some(ref filename) => Box::new(
+            File::open(filename).with_context(|| format!("Could not open file `{filename}`"))?,
+        ),
+        None => Box::new(std::io::stdin()),
+    };
+
+    let mut buffer = String::new();
+    let filename = args.input.unwrap_or("STDIN".to_string());
+    reader
+        .read_to_string(&mut buffer)
+        .with_context(|| format!("Could not read `{filename}`"))?;
+
+    let json: Value = serde_json::from_str(&buffer)
+        .with_context(|| format!("`{filename}` does not contain valid JSON"))?;
+
+    let mut vars: Vec<EnvVar> = vec![];
+    let separator = args.separator.unwrap_or("__".to_string());
+    JsonParser::parse(&mut vars, "", json, &separator);
+
+    let environ = vars
+        .iter()
+        .map(|v| v.to_string())
+        .collect::<Vec<String>>()
+        .join("\n");
+
+    let mut writer: Box<dyn Write> = match args.output {
+        Some(ref filename) => Box::new(
+            File::create(filename).with_context(|| format!("Could not open file `{filename}`"))?,
+        ),
+        None => Box::new(std::io::stdout()),
+    };
+
+    writer
+        .write_all(environ.as_bytes())
+        .with_context(|| "".to_string())?;
+
+    Ok(())
+}
+
+#[derive(Debug, Parser)]
+#[command(name = "json2env", version, about)]
+struct Args {
+    /// Input file, defaults to STDIN if not specified
+    #[arg(short, long, value_name = "FILE")]
+    input: Option<String>,
+
+    /// Output file, defaults to STDOUT if not specified
+    #[arg(short, long, value_name = "FILE")]
+    output: Option<String>,
+
+    /// Separator for nested keys, defaults to double underscore (__)
+    #[arg(short, long, value_name = "STRING")]
+    separator: Option<String>,
+}
+
+struct JsonParser;
+
+impl JsonParser {
+    fn parse(lines: &mut Vec<EnvVar>, key: &str, value: Value, separator: &str) {
+        match value {
+            Value::Array(array) => {
+                for (index, item) in array.into_iter().enumerate() {
+                    let key = Self::build_key(key, index.to_string(), separator);
+                    Self::parse(lines, key.as_str(), item, separator)
+                }
+            }
+            Value::Object(object) => {
+                for (name, value) in object {
+                    let key = Self::build_key(key, name, separator);
+                    Self::parse(lines, key.as_str(), value, separator)
+                }
+            }
+            _ => lines.push(EnvVar::new(key.trim().to_owned(), value)),
+        }
+    }
+
+    fn build_key(prefix: &str, key: String, separator: &str) -> String {
+        match prefix.is_empty() {
+            true => key,
+            false => format!("{prefix}{separator}{key}"),
+        }
+    }
+}
+
+#[derive(Debug, PartialEq, Eq)]
+struct EnvVar {
+    name: String,
+    value: Value,
+}
+
+impl EnvVar {
+    fn new(name: String, value: Value) -> Self {
+        Self { name, value }
+    }
+}
+
+impl Display for EnvVar {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self.value.clone() {
+            Value::Null => write!(f, "{key}=null", key = self.name),
+            Value::Bool(bool) => write!(f, "{key}={bool}", key = self.name),
+            Value::Number(number) => write!(f, "{key}={number}", key = self.name),
+            Value::String(string) => write!(f, "{key}=\"{string}\"", key = self.name),
+            _ => Err(std::fmt::Error),
+        }
+    }
+}