Initial commit with readme, script, and hello world

Absolutely minimum viable stuff.

.gitignore

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+*~
+*.swp

01_hello.zig

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+// Oh no! This program is supposed to print "Hello world!" but it has some
+// mistakes. Let's fix it.
+//
+// We're trying to import the Standard Library into the top level of our
+// application. The standard library is not named "foo", it is named "std".
+//
+// Please correct the name in both places in the import here:
+const foo = @import("foo");
+
+// Zig applications start by calling a function named 'main'. It needs to be
+// public so that it is accessible outside our file!
+//
+// Public functions are declared with the 'pub' keyword like so:
+//
+//     pub fn my_function() void { ... }
+//
+// Please make the main() function public:
+fn main() void {
+
+    // The easiest way to display our "Hello world" message in the
+    // terminal is to use the std.debug.print() function.
+    
+    // Please fix this silly "foo" mistake here:
+    foo.debug.print("Hello world!\n", .{});
+
+    // The print function above takes two values:
+    //
+    //   1. A string of characters: "Hello world!\n". "\n" prints a new line.
+    //
+    //   2. A struct containing data to be displayed. .{} is an empty, nameless
+    //      struct fulfilling the requirement. More about structs later.
+    //
+    //
+    // Now we're ready to...What's this!? Oh, we wanted to print a Goodbye
+    // message as well!
+    //
+    // Please fix this to use the same print function as above:
+    "Goodbye!\n"
+}
+
+// Once you're done with the changes above, run `ziglings` to see if it passes.
+//
+// Finally, all files will contain the following comment:
+//
+// I AM NOT DONE
+//
+// Delete it when you're ready to continue to the next exercise!

README.md

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+# ziglings
+
+Welcome to `ziglings`. This project contains a series of incomplete exercises.
+By completing the exercises, you learn how to read and write
+[Zig](https://ziglang.org/)
+code.
+
+This project was directly inspired by the brilliant and fun
+[rustlings](https://github.com/rust-lang/rustlings)
+project for the [Rust](https://www.rust-lang.org/) language.
+
+## Getting Started
+
+_Note: This currently uses a shell (Bash) script to automate the "game". A
+future update may remove this requirement. See TODO below._
+
+Install the [master release](https://ziglang.org/download/) of the Zig compiler.
+
+Verify the installation and version of `zig` like so:
+
+```bash
+$ zig version
+0.7.1+<some hexadecimal string>
+```
+
+Clone this repository with Git:
+
+```bash
+git clone https://github.com/ratfactor/ziglings
+cd ziglings
+```
+
+Then run the `ziglings` script and follow the instructions to begin!
+
+```bash
+./ziglings
+```
+
+## Manual Usage
+
+If you can't (or don't want to) use the script, you can manually verify each
+exercise with the Zig compiler.
+
+Some exercises need to be "run" (compiled and executed):
+
+```bash
+zig run exercises/01_hello.zig
+```
+
+Some exercises need to be tested:
+
+```bash
+zig test exercises/02_hello_test.zig
+```
+
+## TODO
+
+Contributions are very welcome! I'm writing this to teach myself and to create
+the learning resource I wished for. There will be tons of room for improvement:
+
+* Wording of explanations
+* Idiomatic usage of Zig
+* Additional exercises
+* Re-write the `ziglings` script using the Zig build system (???)
+
+Planned exercises:
+
+* [x] Hello world
+* [ ] Hello tests
+* [ ] Assignment
+* [ ] Arrays
+* [ ] If
+* [ ] While
+* [ ] For
+* [ ] Functions
+* [ ] Defer
+* [ ] Errors
+* [ ] Switch
+* [ ] Runtime safety
+* [ ] Unreachable
+* [ ] Pointers
+* [ ] Pointer sized integers
+* [ ] Multi pointers
+* [ ] Slices
+* [ ] Enums
+* [ ] Structs
+* [ ] Unions
+* [ ] Integer rules
+* [ ] Floats
+* [ ] Labelled blocks
+* [ ] Labelled loops
+* [ ] Loops as expressions
+* [ ] Optionals
+* [ ] Comptime
+* [ ] Inline loops
+* [ ] Anonymous structs
+* [ ] Sentinel termination
+* [ ] Vectors
+* [ ] Imports
+
+The initial topics for these exercises were unabashedly cribbed from
+[ziglearn.org](https://ziglearn.org/).

ziglings

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+#!/bin/bash
+
+# Minimum viable working example!
+
+echo
+echo "         _       _ _ "
+echo "     ___(_) __ _| (_)_ __   __ _ ___ "
+echo "    |_  | |/ _' | | | '_ \ / _' / __| "
+echo "     / /| | (_| | | | | | | (_| \__ \ "
+echo "    /___|_|\__, |_|_|_| |_|\__, |___/ "
+echo "           |___/           |___/ "
+echo
+
+# Capture terminal escape sequences (ANSI) for formatting
+fmt_err=$( tput setaf 1 ) # red foreground
+fmt_yay=$( tput setaf 2 ) # green foreground
+fmt_off=$( tput sgr0 )    # reset colors/effects
+
+
+
+# TODO: most of this belongs in a generalized function
+if grep -q "I AM NOT DONE" 01_hello.zig
+then
+
+echo
+echo "* Exercise: Hello world *"
+
+result=$(zig run 01_hello.zig 2>&1)
+result_status=$?
+echo =========================================================================
+echo "$result"
+echo =========================================================================
+if [[ $result_status -eq 0 ]]
+then
+    printf "${fmt_yay}Zig was able to compile your submission.${fmt_off}\n"
+else
+    printf "${fmt_err}Uh oh! Looks like there was an error.${fmt_off}\n"
+    exit
+fi
+
+if [[ $result == *Hello*Goodbye* ]]
+then
+    printf "${fmt_yay}Excellent! I see that you're printing both Hello and Goodbye!${fmt_off}\n"
+else
+    printf "${fmt_err}It seems to compile, but...${fmt_off}\n"
+    exit
+fi
+
+echo "Now you're ready to move on!"
+echo "Delete the line I AM NOT DONE from the source file when you're ready"
+echo "to continue."
+
+exit
+
+else # end of exercise one - I AM NOT DONE is removed!
+    printf "${fmt_yay}DONE - Hello world${fmt_off}\n"
+fi
+
+
+echo
+echo "* Exercise: Hello test *"
+echo
+echo "TODO: this and other exercises :-)"