Add git-edit-coauthor command

It is now possible to edit the available co-authors, in case you
misspelled someone's name, or they change their email address, or
something.

Cargo.lock

@@ -158,7 +158,7 @@ dependencies = [
 
 [[package]]
 name = "git_mob"
-version = "0.1.0"
+version = "0.2.0"
 dependencies = [
  "dirs",
  "git2",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "git_mob"
-version = "0.1.0"
+version = "0.2.0"
 authors = ["Martin Frost <martin@frost.ws>"]
 edition = "2018"
 description = "A CLI tool for social coding."

README.md

@@ -14,7 +14,7 @@ It is essentially a Rust clone of the [git-mob NPM package](https://www.npmjs.co
 * Add Alice and Bob as a possible co-authors:
 
       git add-coauthor a "Alice" alice@example.com
-      git add-coauthor b "Bob" bob@example.com
+      git add-coauthor b "bob" Bob@example.com
 
 * Set Alice as co-author, making your mob consist of you and Alice:
 
@@ -24,6 +24,10 @@ It is essentially a Rust clone of the [git-mob NPM package](https://www.npmjs.co
 
       git mob a b
 
+* Edit Bob's name, since you accidentally capitalized his email instead of his name:
+
+      git edit-coauthor b --name "Bob" --email bob@example.com
+
 * Remove Bob as a possible co-author:
 
       git delete-coauthor b
@@ -41,6 +45,7 @@ It is essentially a Rust clone of the [git-mob NPM package](https://www.npmjs.co
 
 * `git mob <co-author-initials>`
 * `git add-coauthor <initials> "Co-author Name" <co-author-email-address>`
+* `git edit-coauthor [--name "Co-author Name"] [--email <co-author-email-address>]`
 * `git delete-coauthor <initials>`
 * `git mob -l`
 * `git solo`
@@ -55,7 +60,6 @@ be implemented, and then there is also a severe lack of tests and documentation.
 ### Missing features
 
 * `git mob-print`
-* `git edit-coauthor`
 * `git suggest-coauthors`
 * `-o` for overwriting the main author
 * `--installTemplate` and `--uninstallTemplate` for prepare-commit-msg

src/bin/git-edit-coauthor.rs

@@ -0,0 +1,41 @@
+use git_mob::{Author, get_available_coauthors, write_coauthors_file} ;
+use structopt::StructOpt;
+use std::process;
+
+#[derive(StructOpt,Debug)]
+struct Opt {
+    /// Co-author initials
+    initials: String,
+    /// The name of the co-author, in quotes, e.g. "Foo Bar"
+    #[structopt(long, required_unless("email"))]
+    name: Option<String>,
+    /// The email of the co-author
+    #[structopt(long, required_unless("name"))]
+    email: Option<String>,
+}
+
+fn main() {
+    let opt = Opt::from_args();
+
+    let mut authors = get_available_coauthors();
+    let mut updated_author : Author;
+
+    if let Some(author) = authors.get(&opt.initials) {
+        updated_author = author.clone();
+    } else {
+        eprintln!("No author found with initials {}", &opt.initials);
+        process::exit(1);
+    }
+
+    if let Some(name) = opt.name {
+        updated_author.name = name;
+    }
+
+    if let Some(email) = opt.email {
+        updated_author.email = email;
+    }
+
+    authors.insert(opt.initials, updated_author);
+
+    write_coauthors_file(authors);
+}