fix: expose the Guess type

src/go/guess.rs

@@ -10,9 +10,13 @@ pub struct GoGuess {
 }
 
 
+/// The result of a language guess.
 #[derive(Debug)]
 pub struct Guess {
+    /// Which language it is
     pub language: String,
+    /// If there are more than one possibles languages, the first language
+    /// (alphabetically) will be returned, and this field will be set to false.
     pub safe: bool,
 }
 

src/lib.rs

@@ -3,7 +3,9 @@ use std::os::raw::c_uchar;
 
 use crate::go::slice::{GoSlice, ToGoSlice};
 use crate::go::string::{GoString, ToGoString};
-use crate::go::guess::{GoGuess, Guess};
+use crate::go::guess::GoGuess;
+
+pub use go::guess::Guess;
 
 mod go;
 
@@ -40,6 +42,18 @@ extern "C" {
     // fn GetLanguagesByVimModeline(filename: GoString, content: GoSlice, candidates: GoSlice, result: &mut GoSlice);
 }
 
+/// `get_languages()` applies a sequence of strategies based on the given filename and
+/// content to find out the most probable languages to return.
+///
+/// If it finds a strategy that produces a single result, it will be returned;
+/// otherise the last strategy that returned multiple results will be returned.
+/// If the content is binary, no results will be returned. This matches the
+/// behavior of [Linguist.detect]
+///
+/// At least one of arguments should be set. If content is missing, language
+/// detection will be based on the filename. The function won't read the file, given an empty content.
+///
+/// [Linguist.detect]: https://github.com/github/linguist/blob/aad49acc0624c70d654a8dce447887dbbc713c7a/lib/linguist.rb#L14-L49
 pub fn get_languages(filename: &str, content: &[u8]) -> Result<Vec<String>, NulError> {
     let c_filename = CString::new(filename).expect("Can't construct string");
     let c_content = CString::new(content).expect("Can't construct content string");
@@ -50,6 +64,12 @@ pub fn get_languages(filename: &str, content: &[u8]) -> Result<Vec<String>, NulE
     }
 }
 
+/// `get_languages_by_content()` returns a slice of languages for the given
+/// content. It is a Strategy that uses content-based regexp heuristics and a
+/// filename extension.
+///
+/// If there are more than one possibles languages it returns the first language
+/// by alphabetically order and the `safe` field of `Guess` will be set to false.
 pub fn get_language_by_content(filename: &str, content: &[u8]) -> Result<Guess, NulError> {
     let c_filename = CString::new(filename)?;
     let c_content = CString::new(content)?;
@@ -65,6 +85,7 @@ pub fn get_language_by_content(filename: &str, content: &[u8]) -> Result<Guess,
     }
 }
 
+/// `get_language_extensions()` returns all extensions associated with the given language.
 pub fn get_language_extensions(language: &str) -> Result<Vec<String>, NulError> {
     let c_language = CString::new(language)?;
     let mut go_result = GoSlice::default();
@@ -74,6 +95,8 @@ pub fn get_language_extensions(language: &str) -> Result<Vec<String>, NulError>
     }
 }
 
+/// `get_language()` applies a sequence of strategies based on the given filename
+/// and content to find out the most probable language to return.
 pub fn get_language(filename: &str, content: &[u8]) -> Result<String, NulError> {
     let c_filename = CString::new(filename)?;
     let c_content = CString::new(content)?;
@@ -88,6 +111,7 @@ pub fn get_language(filename: &str, content: &[u8]) -> Result<String, NulError>
     }
 }
 
+/// `get_mime_type()` returns a MIME type of a given file based on its languages.
 pub fn get_mime_type(path: &str, language: &str) -> Result<String, NulError> {
     let c_path = CString::new(path)?;
     let c_language = CString::new(language)?;
@@ -96,72 +120,107 @@ pub fn get_mime_type(path: &str, language: &str) -> Result<String, NulError> {
     }
 }
 
+
+/// `get_language_by_extension()` returns detected language.
+///
+/// If there are more than one possibles languages it returns the first language
+/// by alphabetically order and the `safe` field of `Guess` will be set to false.
 pub fn get_language_by_extension(filename: &str) -> Result<Guess, NulError> {
     let c_filename = CString::new(filename)?;
     unsafe { Ok(Guess::from(GetLanguageByExtension(c_filename.as_go_string()))) }
 }
 
+/// `get_language_by_filename()` returns detected language.
+///
+/// If there are more than one possibles languages it returns the first language
+/// by alphabetically order and the `safe` field of `Guess` will be set to false.
 pub fn get_language_by_filename(filename: &str) -> Result<Guess, NulError> {
     let c_filename = CString::new(filename)?;
     unsafe { Ok(Guess::from(GetLanguageByFilename(c_filename.as_go_string()))) }
 }
 
+/// `get_language_by_modeline()` returns detected language.
+///
+/// If there are more than one possibles languages it returns the first language
+/// by alphabetically order and the `safe` field of `Guess` will be set to false.
 pub fn get_language_by_modeline(content: &[u8]) -> Result<Guess, NulError> {
     let c_content = CString::new(content)?;
     unsafe { Ok(Guess::from(GetLanguageByModeline(c_content.as_go_slice()))) }
 }
 
+/// `get_language_by_shebang()` returns detected language.
+///
+/// If there are more than one possibles languages it returns the first language
+/// by alphabetically order and the `safe` field of `Guess` will be set to false.
 pub fn get_language_by_shebang(content: &[u8]) -> Result<Guess, NulError> {
     let c_content = CString::new(content)?;
     unsafe { Ok(Guess::from(GetLanguageByShebang(c_content.as_go_slice()))) }
 }
 
+/// `get_language_by_vim_modeline()` returns detected language.
+///
+/// If there are more than one possibles languages it returns the first language
+/// by alphabetically order and the `safe` field of `Guess` will be set to false.
 pub fn get_language_by_vim_modeline(content: &[u8]) -> Result<Guess, NulError> {
     let c_content = CString::new(content)?;
     unsafe { Ok(Guess::from(GetLanguageByVimModeline(c_content.as_go_slice()))) }
 }
 
+/// `get_language_by_emacs_modeline()` returns detected language.
+///
+/// If there are more than one possibles languages it returns the first language
+/// by alphabetically order and the `safe` field of `Guess` will be set to false.
 pub fn get_language_by_emacs_modeline(content: &[u8]) -> Result<Guess, NulError> {
     let c_content = CString::new(content)?;
     unsafe { Ok(Guess::from(GetLanguageByEmacsModeline(c_content.as_go_slice()))) }
 }
 
+/// `is_binary()` detects if data is a binary value based
+/// on this [code snippet](http://git.kernel.org/cgit/git/git.git/tree/xdiff-interface.c?id=HEAD#n198).
 pub fn is_binary(data: &[u8]) -> Result<bool, NulError> {
     let c_data = CString::new(data)?;
     unsafe { Ok(IsBinary(c_data.as_go_slice()) == 1) }
 }
 
+/// `is_configuration()` tells if filename is in one of the configuration languages.
 pub fn is_configuration(path: &str) -> Result<bool, NulError> {
     let c_path = CString::new(path)?;
     unsafe { Ok(IsConfiguration(c_path.as_go_string()) == 1) }
 }
 
+/// `is_documentation()` returns whether or not path is a documentation path.
 pub fn is_documentation(path: &str) -> Result<bool, NulError> {
     let c_path = CString::new(path)?;
     unsafe { Ok(IsDocumentation(c_path.as_go_string()) == 1) }
 }
 
+/// `is_dot_file()` returns whether or not path has dot as a prefix.
 pub fn is_dot_file(path: &str) -> Result<bool, NulError> {
     let c_path = CString::new(path)?;
     unsafe { Ok(IsDotFile(c_path.as_go_string()) == 1) }
 }
 
+/// `is_image()` tells if a given file is an image (PNG, JPEG or GIF format).
 pub fn is_image(path: &str) -> Result<bool, NulError> {
     let c_path = CString::new(path)?;
     unsafe { Ok(IsImage(c_path.as_go_string()) == 1) }
 }
 
+/// `is_vendor()` returns whether or not path is a vendor path.
 pub fn is_vendor(path: &str) -> Result<bool, NulError> {
     let c_path = CString::new(path)?;
     unsafe { Ok(IsVendor(c_path.as_go_string()) == 1) }
 }
 
+/// `is_generated()` returns whether the file with the given path and content
+/// is a generated file.
 pub fn is_generated(path: &str, content: &[u8]) -> Result<bool, NulError> {
     let c_path = CString::new(path)?;
     let c_content = CString::new(content)?;
     unsafe { Ok(IsGenerated(c_path.as_go_string(), c_content.as_go_slice()) == 1) }
 }
 
+/// `get_color()` returns the HTML color code of a given language.
 pub fn get_color(language: &str) -> Result<String, NulError> {
     let c_language = CString::new(language)?;
     unsafe { Ok(GetColor(c_language.as_go_string()).to_string()) }