Basic book building

scripts/build-book

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+#!/usr/bin/env raku
+
+use File::Temp;
+use Shell::Command;
+use paths;
+
+
+my $tempdir = tempdir.IO;
+my $ttc-number = dir('build/ttc').first.basename;
+my $ttc = "build/ttc/$ttc-number".IO;
+
+# Filenames to ignore while processing source files
+my Str:D @ignored = ["README.md", "SUMMARY.md"];
+# Check to see if a filename is ignored
+sub not-ignored($path) {
+    for @ignored -> $ignored {
+        return False if $path.ends-with: $ignored;
+    }
+    return True;
+}
+
+# Copy a file from the current directory to the temporary directory, preserving
+# realtive path. Resolves symlinks in source, but does not reflect symlink
+# resoultion in the output path
+sub cp-temp($src) {
+   my $src-path = do given $src {
+       when Str {
+           $src.IO
+       }
+       when IO::Path {
+           $src
+       }
+       default {
+           die "Invalid source $src, {$src.WHAT}"
+       }
+   }
+   my $output-path = $tempdir.add($src-path.relative).IO;
+   # Create the parent directory if needed
+   if !$output-path.parent.d {
+       $output-path.parent.mkdir;
+
+   }
+   # Copy the file
+   $src-path.resolve.copy: $output-path;
+}
+
+# Invoke katla on a source file, streaming its output to the temporary directory
+sub katla($src, $ttc-src) {
+    # TODO: Post process them to set themeing correctly
+    # Run katla and collect the output
+    my $katla = run 'katla', 'markdown', $src, $ttc-src, :out;
+    my $output = $katla.out.slurp(:close);
+    # Spurt the output to the temporary directory
+    my $output-path = $tempdir.add: $src;
+    if !$output-path.parent.d {
+        $output-path.parent.mkdir;
+    }
+    $output-path.spurt($output);
+}
+
+# Copy our metadata files
+cp-temp "book.toml";
+cp-temp "src/README.md";
+cp-temp "src/SUMMARY.md";
+
+# Katla over the source files
+for paths("src", :file(*.&not-ignored)) -> $path {
+    my $ttc-path = $ttc.add($path.IO.relative: "src").extension: "ttm";
+    katla $path.IO.relative, $ttc-path.relative;
+}
+
+# Build the book
+
+indir $tempdir, {
+    my $mdbook = run <mdbook build>;
+    die "Ooops" unless $mdbook;
+}
+
+# Copy it over
+rm_rf "book";
+cp $tempdir.add("book"), "book", :r;