1 files changed, 159 insertions, 0 deletions
diff --git a/clap/src/args/arg_builder/flag.rs b/clap/src/args/arg_builder/flag.rs
new file mode 100644
index 0000000..641e777
--- /dev/null
+++ b/clap/src/args/arg_builder/flag.rs
@@ -0,0 +1,159 @@
+// Std
+use std::convert::From;
+use std::fmt::{Display, Formatter, Result};
+use std::rc::Rc;
+use std::result::Result as StdResult;
+use std::ffi::{OsStr, OsString};
+use std::mem;
+
+// Internal
+use Arg;
+use args::{AnyArg, ArgSettings, Base, DispOrder, Switched};
+use map::{self, VecMap};
+
+#[derive(Default, Clone, Debug)]
+#[doc(hidden)]
+pub struct FlagBuilder<'n, 'e>
+where
+    'n: 'e,
+{
+    pub b: Base<'n, 'e>,
+    pub s: Switched<'e>,
+}
+
+impl<'n, 'e> FlagBuilder<'n, 'e> {
+    pub fn new(name: &'n str) -> Self {
+        FlagBuilder {
+            b: Base::new(name),
+            ..Default::default()
+        }
+    }
+}
+
+impl<'a, 'b, 'z> From<&'z Arg<'a, 'b>> for FlagBuilder<'a, 'b> {
+    fn from(a: &'z Arg<'a, 'b>) -> Self {
+        FlagBuilder {
+            b: Base::from(a),
+            s: Switched::from(a),
+        }
+    }
+}
+
+impl<'a, 'b> From<Arg<'a, 'b>> for FlagBuilder<'a, 'b> {
+    fn from(mut a: Arg<'a, 'b>) -> Self {
+        FlagBuilder {
+            b: mem::replace(&mut a.b, Base::default()),
+            s: mem::replace(&mut a.s, Switched::default()),
+        }
+    }
+}
+
+impl<'n, 'e> Display for FlagBuilder<'n, 'e> {
+    fn fmt(&self, f: &mut Formatter) -> Result {
+        if let Some(l) = self.s.long {
+            write!(f, "--{}", l)?;
+        } else {
+            write!(f, "-{}", self.s.short.unwrap())?;
+        }
+
+        Ok(())
+    }
+}
+
+impl<'n, 'e> AnyArg<'n, 'e> for FlagBuilder<'n, 'e> {
+    fn name(&self) -> &'n str { self.b.name }
+    fn overrides(&self) -> Option<&[&'e str]> { self.b.overrides.as_ref().map(|o| &o[..]) }
+    fn requires(&self) -> Option<&[(Option<&'e str>, &'n str)]> {
+        self.b.requires.as_ref().map(|o| &o[..])
+    }
+    fn blacklist(&self) -> Option<&[&'e str]> { self.b.blacklist.as_ref().map(|o| &o[..]) }
+    fn required_unless(&self) -> Option<&[&'e str]> { self.b.r_unless.as_ref().map(|o| &o[..]) }
+    fn is_set(&self, s: ArgSettings) -> bool { self.b.settings.is_set(s) }
+    fn has_switch(&self) -> bool { true }
+    fn takes_value(&self) -> bool { false }
+    fn set(&mut self, s: ArgSettings) { self.b.settings.set(s) }
+    fn max_vals(&self) -> Option<u64> { None }
+    fn val_names(&self) -> Option<&VecMap<&'e str>> { None }
+    fn num_vals(&self) -> Option<u64> { None }
+    fn possible_vals(&self) -> Option<&[&'e str]> { None }
+    fn validator(&self) -> Option<&Rc<Fn(String) -> StdResult<(), String>>> { None }
+    fn validator_os(&self) -> Option<&Rc<Fn(&OsStr) -> StdResult<(), OsString>>> { None }
+    fn min_vals(&self) -> Option<u64> { None }
+    fn short(&self) -> Option<char> { self.s.short }
+    fn long(&self) -> Option<&'e str> { self.s.long }
+    fn val_delim(&self) -> Option<char> { None }
+    fn help(&self) -> Option<&'e str> { self.b.help }
+    fn long_help(&self) -> Option<&'e str> { self.b.long_help }
+    fn val_terminator(&self) -> Option<&'e str> { None }
+    fn default_val(&self) -> Option<&'e OsStr> { None }
+    fn default_vals_ifs(&self) -> Option<map::Values<(&'n str, Option<&'e OsStr>, &'e OsStr)>> {
+        None
+    }
+    fn env<'s>(&'s self) -> Option<(&'n OsStr, Option<&'s OsString>)> { None }
+    fn longest_filter(&self) -> bool { self.s.long.is_some() }
+    fn aliases(&self) -> Option<Vec<&'e str>> {
+        if let Some(ref aliases) = self.s.aliases {
+            let vis_aliases: Vec<_> = aliases
+                .iter()
+                .filter_map(|&(n, v)| if v { Some(n) } else { None })
+                .collect();
+            if vis_aliases.is_empty() {
+                None
+            } else {
+                Some(vis_aliases)
+            }
+        } else {
+            None
+        }
+    }
+}
+
+impl<'n, 'e> DispOrder for FlagBuilder<'n, 'e> {
+    fn disp_ord(&self) -> usize { self.s.disp_ord }
+}
+
+impl<'n, 'e> PartialEq for FlagBuilder<'n, 'e> {
+    fn eq(&self, other: &FlagBuilder<'n, 'e>) -> bool { self.b == other.b }
+}
+
+#[cfg(test)]
+mod test {
+    use args::settings::ArgSettings;
+    use super::FlagBuilder;
+
+    #[test]
+    fn flagbuilder_display() {
+        let mut f = FlagBuilder::new("flg");
+        f.b.settings.set(ArgSettings::Multiple);
+        f.s.long = Some("flag");
+
+        assert_eq!(&*format!("{}", f), "--flag");
+
+        let mut f2 = FlagBuilder::new("flg");
+        f2.s.short = Some('f');
+
+        assert_eq!(&*format!("{}", f2), "-f");
+    }
+
+    #[test]
+    fn flagbuilder_display_single_alias() {
+        let mut f = FlagBuilder::new("flg");
+        f.s.long = Some("flag");
+        f.s.aliases = Some(vec![("als", true)]);
+
+        assert_eq!(&*format!("{}", f), "--flag");
+    }
+
+    #[test]
+    fn flagbuilder_display_multiple_aliases() {
+        let mut f = FlagBuilder::new("flg");
+        f.s.short = Some('f');
+        f.s.aliases = Some(vec![
+            ("alias_not_visible", false),
+            ("f2", true),
+            ("f3", true),
+            ("f4", true),
+        ]);
+        assert_eq!(&*format!("{}", f), "-f");
+    }
+}