Merge 27d0c9cb9f into ce1eb55d7e

quickreplace/.gitignore

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+target

quickreplace/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "quickreplace"
+version = "0.1.0"

quickreplace/Cargo.toml

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+[package]
+name = "quickreplace"
+version = "0.1.0"
+authors = ["You <you@example.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+text-colorizer = "1"
+regex = "1"

quickreplace/src/main.rs

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+use text_colorizer::*;
+use std::env;
+use std::fs;
+use regex::Regex;
+
+#[derive(Debug)]
+struct Arguments {
+    target: String,
+    replacement: String,
+    filename: String,
+    output: String,
+}
+
+fn print_usage() {
+    eprintln!("{} - change occurrences of one string into another", "quickreplace".green());
+    eprintln!("Usage: quickreplace <target> <replacement> <INPUT> <OUTPUT>");
+}
+
+fn parse_args() -> Arguments {
+    let args: Vec<String> = env::args().skip(1).collect();
+    if args.len() != 4 {
+        print_usage();
+        eprintln!("{} wrong number of arguments: expected 4, got {}.", "Error:".red().bold(),
+                  args.len());
+        std::process::exit(1);
+    }
+    Arguments {
+        target: args[0].clone(),
+        replacement: args[1].clone(),
+        filename: args[2].clone(),
+        output: args[3].clone()
+    }
+}
+
+fn replace(target: &str, replacement: &str, text: &str) -> Result<String, regex::Error>
+{
+    let regex = Regex::new(target)?;
+    Ok(regex.replace_all(text, replacement).to_string())
+}
+
+
+fn main() {
+    let args = parse_args();
+    let data = match fs::read_to_string(&args.filename) {
+        Ok(v) => v,
+        Err(e) => {
+            eprintln!("{} failed to read from file '{}': {:?}",
+                      "Error:".red().bold(), args.filename, e);
+            std::process::exit(1);
+        }
+    };
+    let replaced_data = match replace(&args.target, &args.replacement, &data) {
+        Ok(v) => v,
+        Err(e) => {
+            eprintln!("{} failed to replace text: {:?}", "Error:".red().bold(), e);
+            std::process::exit(1);
+        }
+    };
+    match fs::write(&args.output, &replaced_data) {
+        Ok(v) => v,
+        Err(e) => {
+            eprintln!("{} failed to write to file '{}': {:?}",
+                      "Error:".red().bold(), args.filename, e);
+            std::process::exit(1);
+        }
+    };
+}