add stack support (#234)

README.md

@@ -89,6 +89,7 @@ Just run `topgrade`. It will run the following steps:
 * Upgrade [myrepos](https://myrepos.branchable.com/) managed sourcecode repositories
 * Upgrade Python packages installed using [pipx](https://github.com/cs01/pipx)
 * Upgrade [R globally installed packages](https://github.com/ankane/jetpack)
+* Upgrade [stack](https://docs.haskellstack.org/en/stable/README/)
 * Upgrade Vim/Neovim packages. Works with the following plugin frameworks:
   * [NeoBundle](https://github.com/Shougo/neobundle.vim)
   * [Vundle](https://github.com/VundleVim/Vundle.vim)

src/main.rs

@@ -358,6 +358,12 @@ fn run() -> Result<(), Error> {
         || generic::run_pipx_update(run_type),
         config.no_retry(),
     )?;
+    execute(
+        &mut report,
+        "stack",
+        || generic::run_stack_update(run_type),
+        config.no_retry(),
+    )?;
     execute(
         &mut report,
         "myrepos",

src/steps/generic.rs

@@ -88,6 +88,13 @@ pub fn run_pipx_update(run_type: RunType) -> Result<(), Error> {
     run_type.execute(&pipx).arg("upgrade-all").check_run()
 }
 
+pub fn run_stack_update(run_type: RunType) -> Result<(), Error> {
+    let stack = utils::require("stack")?;
+    print_separator("stack");
+
+    run_type.execute(&stack).arg("upgrade").check_run()
+}
+
 pub fn run_myrepos_update(base_dirs: &BaseDirs, run_type: RunType) -> Result<(), Error> {
     let myrepos = utils::require("mr")?;
     base_dirs.home_dir().join(".mrconfig").require()?;