Allow for clap to parse argument values into types

This changes

- `.flag`, `.option`, `.options` and `.positionals` are now just fields
  you access on the result of `parse` and `parseEx`.
- `clap.ComptimeClap` has been removed.
- `clap.StreamingClap` is now called `clap.streaming.Clap`
- `parse` and `parseEx` now takes a `value_parsers` argument that
  provides the parsers to parse values.
- Remove `helpEx`, `helpFull`, `usageEx` and `usageFull`. They now just
  expect `Id` to have methods for getting the description and value
  texts.

1 files changed, 13 insertions, 11 deletions

diff --git a/example/simple.zig b/example/simple.zig
index ff6d301..11e975e 100644
--- a/example/simple.zig
+++ b/example/simple.zig
@@ -8,29 +8,31 @@ pub fn main() !void {
     // First we specify what parameters our program can take.
     // We can use `parseParam` to parse a string to a `Param(Help)`
     const params = comptime [_]clap.Param(clap.Help){
-        clap.parseParam("-h, --help             Display this help and exit.              ") catch unreachable,
-        clap.parseParam("-n, --number <NUM>     An option parameter, which takes a value.") catch unreachable,
-        clap.parseParam("-s, --string <STR>...  An option parameter which can be specified multiple times.") catch unreachable,
-        clap.parseParam("<POS>...") catch unreachable,
+        clap.parseParam("-h, --help             Display this help and exit.") catch unreachable,
+        clap.parseParam("-n, --number <usize>   An option parameter, which takes a value.") catch unreachable,
+        clap.parseParam("-s, --string <str>...  An option parameter which can be specified multiple times.") catch unreachable,
+        clap.parseParam("<str>...") catch unreachable,
     };
 
     // Initalize our diagnostics, which can be used for reporting useful errors.
     // This is optional. You can also pass `.{}` to `clap.parse` if you don't
     // care about the extra information `Diagnostics` provides.
     var diag = clap.Diagnostic{};
-    var args = clap.parse(clap.Help, &params, .{ .diagnostic = &diag }) catch |err| {
+    var res = clap.parse(clap.Help, &params, clap.parsers.default, .{
+        .diagnostic = &diag,
+    }) catch |err| {
         // Report useful error and exit
         diag.report(io.getStdErr().writer(), err) catch {};
         return err;
     };
-    defer args.deinit();
+    defer res.deinit();
 
-    if (args.flag("--help"))
+    if (res.args.help)
         debug.print("--help\n", .{});
-    if (args.option("--number")) |n|
-        debug.print("--number = {s}\n", .{n});
-    for (args.options("--string")) |s|
+    if (res.args.number) |n|
+        debug.print("--number = {}\n", .{n});
+    for (res.args.string) |s|
         debug.print("--string = {s}\n", .{s});
-    for (args.positionals()) |pos|
+    for (res.positionals) |pos|
         debug.print("{s}\n", .{pos});
 }