Checkpoint

1 files changed, 101 insertions, 0 deletions

diff --git a/src/bin/br/main.rs b/src/bin/br/main.rs
new file mode 100644
index 0000000..4df8c67
--- /dev/null
+++ b/src/bin/br/main.rs
@@ -0,0 +1,101 @@
+mod asm;
+mod run;
+
+use switchboard::{Switchboard, SwitchQuery};
+
+
+fn main() {
+    let mut args = Switchboard::from_env();
+    if args.named("help").short('h').as_bool() {
+        print_help();
+    }
+    if args.named("version").as_bool() {
+        print_version();
+    }
+    if args.named("verbose").short('v').as_bool() {
+        log::set_log_level(log::LogLevel::Info);
+    }
+    match args.peek() {
+        Some("run") => { args.pop(); run::main(args) },
+        Some("asm") => { args.pop(); asm::main(args) },
+        _ => run::main(args),
+    }
+}
+
+
+fn print_help() -> ! {
+    println!("\
+Usage: br [source]
+       br asm [source] [destination] [extension]
+
+Integrated Bedrock assembler and emulator.
+
+Usage:
+  To load a Bedrock program from a file, run `br <path>`, where
+  <path> is the path to an assembled Bedrock program.
+
+  To load a Bedrock program from piped input, run `<command> | br`,
+  where <command> is a command that generates Bedrock bytecode.
+
+  To assemble a Bedrock program from a source file and write to an
+  output file, run `br asm <source> <output>`, where <source> is the
+  path of the source file and <output> is the path to write to.
+
+  To assemble and run a Bedrock program without saving to a file,
+  run `br asm <source> | br`, where <source> is the path of the
+  source file.
+
+Environment variables:
+  BEDROCK_PATH
+    A list of colon-separated paths which will be searched to find
+    a Bedrock program when the program doesn't exist in the current
+    directory. This allows the user to run frequently-used programs
+    from any directory.
+  BEDROCK_LIBS
+    A list of colon-separated paths which will be searched to find
+    Bedrock source code files to use as libraries when assembling a
+    Bedrock program. If a library file resolves an unresolved symbol
+    in the program being assembled, the library file will be merged
+    into the program.
+
+Arguments:
+  [program]            Path to a Bedrock program to run
+
+Switches:
+  --verbose,       (-v)  Print additional debug information
+  --version              Print the assembler version and exit
+  --help           (-h)  Prints help
+  --debug,         (-d)  Show debug information while the program is running
+  --fullscreen     (-f)  Start the program in fullscreen mode (toggle with F11)
+  --size=<dim>     (-s)  Set the initial window size in the format <width>x<height>
+  --zoom=<scale>   (-z)  Set the pixel size for the screen (change with F5/F6)
+  --palette=<pal>        Set a debug colour palette in the format <rgb>,... (toggle with F2)
+  --show-cursor    (-c)  Show the operating system cursor over the window
+  --decode-stdin   (-i)  Decode standard input
+  --encode-stdout  (-o)  Encode standard output
+
+Arguments (asm mode):
+  [source]               Bedrock source code file to assemble.
+  [destination]          Destination path for assembler output.
+  [extension]            File extension to identify source files.
+
+Switches (asm mode):
+  --no-libs              Don't include libraries or resolve references.
+  --no-project-libs      Don't include project libraries
+  --no-env-libs          Don't include environment libraries.
+  --tree                 Show the resolved source file heirarchy
+  --check                Assemble the program without saving any output
+  --resolve              Only return resolved source code.
+  --symbols              Generate debug symbols with file extension '.br.sym'
+");
+    std::process::exit(0);
+}
+
+
+fn print_version() -> ! {
+    let name = env!("CARGO_PKG_NAME");
+    let version = env!("CARGO_PKG_VERSION");
+    eprintln!("{name} v{version}");
+    eprintln!("Written by Ben Bridle.");
+    std::process::exit(0);
+}