Adds os recognition support for manjaro linux (#154)

README.md

@@ -18,7 +18,7 @@ Topgrade knows that platform and can utilize its unique features, such as the op
 package manager. Topgrade is tested on and knows the following platforms:
 
 * Linux
-  * Arch
+  * Arch (Antergos, Manjaro)
   * CentOS/RHEL
   * Fedora
   * Debian/Ubuntu
@@ -47,7 +47,7 @@ Just run `topgrade`. It will run the following steps:
 * Try to self-upgrade if compiled with this feature. On Unix systems Topgrade will also respawn
   itself if it was upgraded
 * **Linux**: Run the system package manager:
-  * **Arch**: Run [yay](https://github.com/Jguer/yay) or fall back to pacman
+  * **Arch (based)**: Run [yay](https://github.com/Jguer/yay) or fall back to pacman
   * **CentOS/RHEL**: Run `yum upgrade`
   * **Fedora**: Run `dnf upgrade`
   * **Debian/Ubuntu**: Run `apt update && apt dist-upgrade`

src/steps/os/linux.rs

@@ -36,7 +36,7 @@ impl Distribution {
             match (os_release.id.as_ref(), os_release.id_like.as_ref().map(String::as_str)) {
                 ("debian", _) | (_, Some("debian")) | (_, Some("ubuntu")) => Distribution::Debian,
                 (_, Some("\"suse\"")) => Distribution::Suse,
-                ("arch", _) | (_, Some("archlinux")) | (_, Some("\"arch\"")) => Distribution::Arch,
+                ("arch", _) | (_, Some("archlinux")) | (_, Some("\"arch\"")) | (_, Some("arch")) => Distribution::Arch,
                 ("\"centos\"", _) | ("\"ol\"", _) => Distribution::CentOS,
                 ("fedora", _) => Distribution::Fedora,
                 ("void", _) => Distribution::Void,
@@ -384,4 +384,10 @@ mod tests {
     fn test_antergos() {
         test_template(&include_str!("os_release/antergos"), Distribution::Arch);
     }
+
+    #[test]
+    fn test_manjaro() {
+        test_template(&include_str!("os_release/manjaro"), Distribution::Arch);
+    }
+
 }

src/steps/os/os_release/manjaro

@@ -0,0 +1,8 @@
+NAME="Manjaro Linux"
+ID=manjaro
+ID_LIKE=arch
+PRETTY_NAME="Manjaro Linux"
+ANSI_COLOR="1;32"
+HOME_URL="https://www.manjaro.org/"
+SUPPORT_URL="https://www.manjaro.org/"
+BUG_REPORT_URL="https://bugs.manjaro.org/"