Add command to edit selected file in editor

Pressing `e` while looking at a file in the _Status_ view will launch an external editor with the current file opened. The editor chosen is determined by the default logic introduced in #114.

An improvement to this in the future could be launching at the specific line at which the _Diff_ view is focused, but that seems to require a change in `FileDiff` which is a change bigger than this PR.

Fixes #166

1 files changed, 24 insertions, 1 deletions

diff --git a/src/main.rs b/src/main.rs
index 60ed171d..61dd7a37 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -43,12 +43,13 @@ use scopeguard::defer;
 use scopetime::scope_time;
 use simplelog::{Config, LevelFilter, WriteLogger};
 use spinner::Spinner;
+use std::process::Command;
 use std::{
     env, fs,
     fs::File,
     io::{self, Write},
     panic,
-    path::PathBuf,
+    path::{Path, PathBuf},
     process,
     time::{Duration, Instant},
 };
@@ -241,6 +242,28 @@ fn migrate_config() -> Result<()> {
     Ok(())
 }
 
+fn open_file_in_editor(path: &Path) -> Result<()> {
+    let mut editor = env::var("GIT_EDITOR")
+        .ok()
+        .or_else(|| env::var("VISUAL").ok())
+        .or_else(|| env::var("EDITOR").ok())
+        .unwrap_or_else(|| String::from("vi"));
+    editor.push_str(&format!(" {}", path.to_string_lossy()));
+
+    let mut editor = editor.split_whitespace();
+
+    let command = editor
+        .next()
+        .ok_or_else(|| anyhow!("unable to read editor command"))?;
+
+    Command::new(command)
+        .args(editor)
+        .status()
+        .map_err(|e| anyhow!("\"{}\": {}", command, e))?;
+
+    Ok(())
+}
+
 fn get_app_cache_path() -> Result<PathBuf> {
     let mut path = dirs::cache_dir()
         .ok_or_else(|| anyhow!("failed to find os cache dir."))?;