Add script to update msys shell

bin/update-msys-shell

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+source "$HOME/.dotfiles/script_helpers/printing.sh"
+source "$HOME/.dotfiles/script_helpers/platform.sh"
+
+set -e
+
+if [[ -d "/c/msys64" ]]; then
+    shell_is_mingw is_mingw
+    if [[ $is_mingw -eq 1 ]]; then
+        printf "${BOLD}${YELLOW}Updating MSYS Shell${NORMAL}\n"
+        printf "${BOLD}Note: when this finishes, restart your shell and re-run this script in order to update applications, or manually run ${YELLOW}pacman -Su${NORMAL}\n"
+        pacman -Syu
+        printf "${BOLD}${GREEN}Done!${NORMAL}\n"
+    else
+        error "Please re-run this in a MinGW shell.\n"
+        exit 1
+    fi
+else
+    error "Unable to find C:\msys64 - make sure the shell is installed and then re-run this in the MinGW shell.\n"
+    exit 1
+fi