Add option to `get` to append content

Cargo.lock

@@ -325,7 +325,7 @@ dependencies = [
 
 [[package]]
 name = "gitig"
-version = "0.1.1"
+version = "0.1.2"
 dependencies = [
  "directories",
  "error-chain",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "gitig"
-version = "0.1.1"
+version = "0.1.2"
 authors = ["Marcel Schneider <marcel@webschneider.org>"]
 edition = "2018"
 

src/app.rs

@@ -69,15 +69,21 @@ pub enum Command {
     },
     /// Download a gitignore for a language
     Get {
+        /// Append template to an existing .gitignore file
+        #[structopt(short)]
+        append: bool,
         /// The language for which the gitignore should be downloaded
         ///
         /// A list with all available languages and projects can be printed with `list-templates`.
-        lang: String,
+        lang:   String,
     },
     /// List all available templates that can be downloaded
     ListTemplates,
     /// Write a completion definition for the specified shell to stdout (bash, zsh, etc.)
-    DumpCompletions { shell: Option<structopt::clap::Shell> },
+    DumpCompletions {
+        /// Shell to generate completion for
+        shell: Option<structopt::clap::Shell>,
+    },
 }
 
 /// Runs the command `add`
@@ -99,7 +105,7 @@ fn run_add(glob: &str) -> Result<()> {
 }
 
 /// Runs the command `get`
-fn run_get(lang: &str) -> Result<()> {
+fn run_get(lang: &str, append: bool) -> Result<()> {
     trace!("Run command `get` with lang {}", &lang);
     let mut root = match git_dir()? {
         Some(r) => r,
@@ -121,7 +127,7 @@ fn run_get(lang: &str) -> Result<()> {
     };
 
     root.push(".gitignore");
-    tmpl.write_to(&root)?;
+    tmpl.write_to(&root, append)?;
     trace!("Wrote template to file");
 
     Ok(())
@@ -153,7 +159,7 @@ fn run_dump_completion(shell: Option<structopt::clap::Shell>) -> Result<()> {
 pub fn main(opts: CliOpts) -> Result<()> {
     match opts.cmd {
         Command::Add { glob } => run_add(&glob)?,
-        Command::Get { lang } => run_get(&lang)?,
+        Command::Get { lang, append } => run_get(&lang, append)?,
         Command::ListTemplates => run_list_templates()?,
         Command::DumpCompletions { shell } => run_dump_completion(shell)?,
     };

src/template.rs

@@ -4,7 +4,7 @@ use log::{debug, trace};
 use reqwest::blocking::Client;
 use reqwest::header::{ACCEPT, CONTENT_TYPE, USER_AGENT};
 use serde::{Deserialize, Serialize};
-use std::fs::File;
+use std::fs::OpenOptions;
 use std::io::{BufWriter, Write};
 
 use std::path::PathBuf;
@@ -102,12 +102,22 @@ impl Template {
     /// `load_content` has not yet been called.
     /// Other reasons for `Err` can be io related errors.
     #[allow(clippy::option_expect_used)]
-    pub fn write_to(&self, path: &PathBuf) -> Result<()> {
-        debug!("Writing contents of {} to {}", self.pretty_name(), path.to_string_lossy());
+    pub fn write_to(&self, path: &PathBuf, append: bool) -> Result<()> {
+        debug!(
+            "Writing contents of {} to {} (append: {})",
+            self.pretty_name(),
+            path.to_string_lossy(),
+            append
+        );
         if self.content.is_none() {
             return Err(ErrorKind::TemplateNoContent.into());
         }
-        let file = File::create(path)?;
+        let file = OpenOptions::new()
+            .write(true)
+            .append(append)
+            .create(true)
+            .open(path)
+            .chain_err(|| "Error while opening gitignore file to write template")?;
         let mut writer = BufWriter::new(file);
 
         writer.write_all(self.content.as_ref().expect("checked before to be some").as_bytes())?;