add adding of lines

Cargo.lock

@@ -26,12 +26,40 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f8aac770f1885fd7e387acedd76065302551364496e46b3dd00860b2f8359b9d"
 
+[[package]]
+name = "backtrace"
+version = "0.3.44"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e4036b9bf40f3cf16aba72a3d65e8a520fc4bafcdc7079aea8f848c58c5b5536"
+dependencies = [
+ "backtrace-sys",
+ "cfg-if",
+ "libc",
+ "rustc-demangle",
+]
+
+[[package]]
+name = "backtrace-sys"
+version = "0.1.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5d6575f128516de27e3ce99689419835fce9643a9b215a14d2b5b685be018491"
+dependencies = [
+ "cc",
+ "libc",
+]
+
 [[package]]
 name = "bitflags"
 version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
 
+[[package]]
+name = "cc"
+version = "1.0.50"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "95e28fa049fda1c330bcf9d723be7663a899c4679724b34c81e9f5a326aab8cd"
+
 [[package]]
 name = "cfg-if"
 version = "0.1.10"
@@ -70,6 +98,7 @@ version = "0.12.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d371106cc88ffdfb1eabd7111e432da544f16f3e2d7bf1dfe8bf575f1df045cd"
 dependencies = [
+ "backtrace",
  "version_check",
 ]
 
@@ -204,6 +233,12 @@ dependencies = [
  "redox_syscall",
 ]
 
+[[package]]
+name = "rustc-demangle"
+version = "0.1.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4c691c0e608126e00913e33f0ccf3727d5fc84573623b8d65b2df340b5201783"
+
 [[package]]
 name = "rustversion"
 version = "1.0.2"

Cargo.toml

@@ -14,7 +14,7 @@ libc = "0.2"
 
 [dependencies.error-chain]
 version = "0.12"
-default-features = false  # disable pulling in backtrace
+#default-features = false  # disable pulling in backtrace
 
 [profile.release]
 lto = true

src/app.rs

@@ -11,6 +11,7 @@ use log::{debug, error, info, trace, warn};
 
 // Local Imports
 use crate::errors::*;
+use crate::gitignore::Gitignore;
 use crate::helpers::{git_dir, BoilerplateOpts, HELP_TEMPLATE};
 
 /// The verbosity level when no `-q` or `-v` arguments are given, with `0` being `-q`
@@ -78,6 +79,11 @@ fn run_add(glob: &str) -> Result<()> {
     };
     info!("Working with git root in {:?}", root);
 
+    let mut file_path = PathBuf::from(&root);
+    file_path.push(".gitignore");
+    let gitig = Gitignore::from_path(&file_path);
+    gitig.add_line(glob)?;
+
     Ok(())
 }
 

src/gitignore.rs

@@ -0,0 +1,28 @@
+use crate::errors::*;
+use std::fs::OpenOptions;
+use std::path::PathBuf;
+
+/// An abstraction of the gitignore file
+#[derive(Debug, Default)]
+pub struct Gitignore {
+    /// The path to the gitignore
+    path: PathBuf,
+}
+impl Gitignore {
+    /// Create a new Gitignore struct from a git root folder path
+    ///
+    /// The given `path` must be a valid path to an existing git root folder
+    pub fn from_path(path: &PathBuf) -> Self { Gitignore { path: path.clone() } }
+
+    /// Append a line to the file
+    pub fn add_line(&self, line: &str) -> Result<()> {
+        use std::io::prelude::*;
+        let mut file = OpenOptions::new()
+            .write(true)
+            .append(true)
+            .open(&self.path)
+            .chain_err(|| "Error while opening gitignore file")?;
+        writeln!(file, "{}", line).chain_err(|| "Error while writing line to gitignore")?;
+        Ok(())
+    }
+}

src/helpers.rs

@@ -6,6 +6,7 @@
 // `#![...]` it onto the entire module.
 #![allow(clippy::result_unwrap_used)]
 use log::{info, trace};
+use std::fs::File;
 
 use crate::errors::*;
 use std::fs::DirEntry;

src/main.rs

@@ -36,6 +36,7 @@ use structopt::{clap, StructOpt};
 
 // Local imports
 mod app;
+mod gitignore;
 mod helpers;
 
 /// Boilerplate to parse command-line arguments, set up logging, and handle bubbled-up `Error`s.