Update readme, add license

LICENSE

@@ -0,0 +1,24 @@
+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <https://unlicense.org/>

README.md

@@ -1,18 +1,50 @@
 # buildmd
 
+Build markdown files to html
+
+## Usage
+
 ```
 buildmd - Build markdown files to html with templates and metadata
 
 Usage:
   buildmd file.md
   buildmd file.md -o output.html
+  buildmd ./src/*.md --outdir public
   echo "some markdown" | buildmd
 
 Options:
-  --outfile, -o <file>    Output file path
-  --template, -t <file>   Template file path
-  --stylesheet, -s <file> Stylesheet file path
+  --outfile, -o <file>    Output path
+  --outdir,  -d <dir>     Output directory
   --stdout                Force output to stdout
+  --template, -t <file>   Template path (default: _template.html)
+  --stylesheet, -s <file> Stylesheet path (default: _style.css)
+  --title, -T <string>    Document title override
   --help, -h              Show this help message
-
 ```
+
+## Templates
+
+`buildmd` uses simple HTML files as templates, replacing instances of `%key%` with the value of `key` in the metadata of the document.
+
+By default, `buildmd` will look for a `_template.html` file in the current working directory, unless an alternate template is specified with the `--template` or `-t` option.
+
+The following metadata is available by default:
+
+- `title`: The title of the document
+- `content`: The rendered markdown content
+- `stylesheet`: The document css styles
+- `timestamp`: An ISO string representing when the build occurred
+- `datetime` A localized string representing when the build occurred
+
+Additionally, any data defined in YAML frontmatter in the markdown file
+will be available for use in the template. Properties defined in frontmatter
+take precedence over the default metadata.
+
+If no template file is discovered, `buildmd` will inject a default template that includes the stylesheet, title, and content in well-structured HTML.
+
+## Styles
+
+`buildmd` will automatically look for a `_style.css` file in the current working directory, unless an alternate stylesheet is specified with the `--stylesheet` or `-s` option. The contents of the discovered stylesheet file will be available in the template as `%stylesheet%`.
+
+In the event that no stylesheet is found, `buildmd` will inject a default stylesheet.

src/index.ts

@@ -224,11 +224,12 @@ Usage:
   echo "some markdown" | buildmd
 
 Options:
-  --outfile, -o <file>    Output file path
-  --outdir,  -d <dir>     Output directory path
-  --template, -t <file>   Template file path
-  --stylesheet, -s <file> Stylesheet file path
-  --title, -T <string>    Override title in template
+  --outfile, -o <file>    Output path
+  --outdir,  -d <dir>     Output directory
+  --stdout                Force output to stdout
+  --template, -t <file>   Template path (default: _template.html)
+  --stylesheet, -s <file> Stylesheet path (default: _style.css)
+  --title, -T <string>    Document title override
   --help, -h              Show this help message
 `.trim(),
     );