rustdoc: Add command line option parsing and a config record

src/rustdoc/config.rs

@@ -0,0 +1,257 @@
+import std::getopts;
+
+export output_format::{};
+export output_style::{};
+export config;
+export parse_config;
+
+#[doc = "The type of document to output"]
+enum output_format {
+    #[doc = "Markdown"]
+    markdown,
+    #[doc = "HTML, via markdown and pandoc"]
+    pandoc_html
+}
+
+#[doc = "How to organize the output"]
+enum output_style {
+    #[doc = "All in a single document"]
+    doc_per_crate,
+    #[doc = "Each module in its own document"]
+    doc_per_mod
+}
+
+#[doc = "The configuration for a rustdoc session"]
+type config = {
+    input_crate: str,
+    output_dir: str,
+    output_format: output_format,
+    output_style: output_style,
+    pandoc_cmd: option<str>
+};
+
+fn opt_output_dir() -> str { "output-dir" }
+fn opt_output_format() -> str { "output-format" }
+fn opt_output_style() -> str { "output-style" }
+fn opt_pandoc_cmd() -> str { "pandoc-cmd" }
+
+fn opts() -> [(getopts::opt, str)] {
+    [
+        (getopts::optopt(opt_output_dir()),
+         "put documents here"),
+        (getopts::optopt(opt_output_format()),
+         "either 'markdown' or 'html'"),
+        (getopts::optopt(opt_output_style()),
+         "either 'doc-per-crate' or 'doc-per-mod'"),
+        (getopts::optopt(opt_pandoc_cmd()),
+         "the command for running pandoc")
+    ]
+}
+
+fn default_config(input_crate: str) -> config {
+    {
+        input_crate: input_crate,
+        output_dir: ".",
+        output_format: pandoc_html,
+        output_style: doc_per_mod,
+        pandoc_cmd: none
+    }
+}
+
+fn parse_config(args: [str]) -> result::t<config, str> {
+    let args = vec::tail(args);
+    let opts = tuple::first(vec::unzip(opts()));
+    alt getopts::getopts(args, opts) {
+        result::ok(match) {
+            if vec::len(match.free) == 1u {
+                let input_crate = vec::head(match.free);
+                config_from_opts(input_crate, match)
+            } else if vec::is_empty(match.free) {
+                result::err("no crates specified")
+            } else {
+                result::err("multiple crates specified")
+            }
+        }
+        result::err(f) {
+            result::err(getopts::fail_str(f))
+        }
+    }
+}
+
+fn config_from_opts(
+    input_crate: str,
+    match: getopts::match
+) -> result::t<config, str> {
+
+    let config = default_config(input_crate);
+    let result = result::ok(config);
+    let result = result::chain(result) {|config|
+        let output_dir = getopts::opt_maybe_str(match, opt_output_dir());
+        result::ok({
+            output_dir: option::from_maybe(config.output_dir, output_dir)
+            with config
+        })
+    };
+    let result = result::chain(result) {|config|
+        let output_format = getopts::opt_maybe_str(
+            match, opt_output_format());
+        option::maybe(result::ok(config), output_format) {|output_format|
+            result::chain(parse_output_format(output_format)) {|output_format|
+                result::ok({
+                    output_format: output_format
+                    with config
+                })
+            }
+        }
+    };
+    let result = result::chain(result) {|config|
+        let output_style = getopts::opt_maybe_str(match, opt_output_style());
+        option::maybe(result::ok(config), output_style) {|output_style|
+            result::chain(parse_output_style(output_style)) {|output_style|
+                result::ok({
+                    output_style: output_style
+                    with config
+                })
+            }
+        }
+    };
+    let result = result::chain(result) {|config|
+        let pandoc_cmd = getopts::opt_maybe_str(match, opt_pandoc_cmd());
+        let pandoc_cmd = maybe_find_pandoc(config, pandoc_cmd);
+        result::chain(pandoc_cmd) {|pandoc_cmd|
+            result::ok({
+                pandoc_cmd: pandoc_cmd
+                with config
+            })
+        }
+    };
+    ret result;
+}
+
+fn parse_output_format(output_format: str) -> result::t<output_format, str> {
+    alt output_format {
+      "markdown" { result::ok(markdown) }
+      "html" { result::ok(pandoc_html) }
+      _ { result::err(#fmt("unknown output format '%s'", output_format)) }
+    }
+}
+
+fn parse_output_style(output_style: str) -> result::t<output_style, str> {
+    alt output_style {
+      "doc-per-crate" { result::ok(doc_per_crate) }
+      "doc-per-mod" { result::ok(doc_per_mod) }
+      _ { result::err(#fmt("unknown output style '%s'", output_style)) }
+    }
+}
+
+fn maybe_find_pandoc(
+    _config: config,
+    maybe_pandoc_cmd: option<str>
+) -> result::t<option<str>, str> {
+    // FIXME: When we actually need pandoc then look for it first
+    // on the path, then in cabal; test to make sure pandoc works
+    alt maybe_pandoc_cmd {
+      some(pandoc_cmd) { result::ok(some(pandoc_cmd)) }
+      none { result::ok(some("pandoc")) }
+    }
+}
+
+#[test]
+fn should_error_with_no_crates() {
+    let config = parse_config(["rustdoc"]);
+    assert result::get_err(config) == "no crates specified";
+}
+
+#[test]
+fn should_error_with_multiple_crates() {
+    let config = parse_config(["rustdoc", "crate1.rc", "crate2.rc"]);
+    assert result::get_err(config) == "multiple crates specified";
+}
+
+#[test]
+fn should_set_output_dir_to_cwd_if_not_provided() {
+    let config = parse_config(["rustdoc", "crate.rc"]);
+    assert result::get(config).output_dir == ".";
+}
+
+#[test]
+fn should_set_output_dir_if_provided() {
+    let config = parse_config([
+        "rustdoc", "crate.rc", "--output-dir", "snuggles"
+    ]);
+    assert result::get(config).output_dir == "snuggles";
+}
+
+#[test]
+fn should_set_output_format_to_pandoc_html_if_not_provided() {
+    let config = parse_config(["rustdoc", "crate.rc"]);
+    assert result::get(config).output_format == pandoc_html;
+}
+
+#[test]
+fn should_set_output_format_to_markdown_if_requested() {
+    let config = parse_config([
+        "rustdoc", "crate.rc", "--output-format", "markdown"
+    ]);
+    assert result::get(config).output_format == markdown;
+}
+
+#[test]
+fn should_set_output_format_to_pandoc_html_if_requested() {
+    let config = parse_config([
+        "rustdoc", "crate.rc", "--output-format", "html"
+    ]);
+    assert result::get(config).output_format == pandoc_html;
+}
+
+#[test]
+fn should_error_on_bogus_format() {
+    let config = parse_config([
+        "rustdoc", "crate.rc", "--output-format", "bogus"
+    ]);
+    assert result::get_err(config) == "unknown output format 'bogus'";
+}
+
+#[test]
+fn should_set_output_style_to_doc_per_mod_by_default() {
+    let config = parse_config(["rustdoc", "crate.rc"]);
+    assert result::get(config).output_style == doc_per_mod;
+}
+
+#[test]
+fn should_set_output_style_to_one_doc_if_requested() {
+    let config = parse_config([
+        "rustdoc", "crate.rc", "--output-style", "doc-per-crate"
+    ]);
+    assert result::get(config).output_style == doc_per_crate;
+}
+
+#[test]
+fn should_set_output_style_to_doc_per_mod_if_requested() {
+    let config = parse_config([
+        "rustdoc", "crate.rc", "--output-style", "doc-per-mod"
+    ]);
+    assert result::get(config).output_style == doc_per_mod;
+}
+
+#[test]
+fn should_error_on_bogus_output_style() {
+    let config = parse_config([
+        "rustdoc", "crate.rc", "--output-style", "bogus"
+    ]);
+    assert result::get_err(config) == "unknown output style 'bogus'";
+}
+
+#[test]
+fn should_set_pandoc_command_if_requested() {
+    let config = parse_config([
+        "rustdoc", "crate.rc", "--pandoc-cmd", "panda-bear-doc"
+    ]);
+    assert result::get(config).pandoc_cmd == some("panda-bear-doc");
+}
+
+#[test]
+fn should_set_pandoc_command_when_using_pandoc() {
+    let config = parse_config(["rustdoc", "crate.rc"]);
+    assert result::get(config).pandoc_cmd == some("pandoc");
+}

src/rustdoc/rustdoc.rc

@@ -12,6 +12,7 @@
 use std;
 use rustc;
 
+mod config;
 mod parse;
 mod extract;
 mod attr_parser;