Remove duplicated is_tag() function implementation

libimagentrytag/src/tag.rs

@@ -17,6 +17,8 @@
 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 //
 
+use regex::Regex;
+
 pub type Tag = String;
 pub type TagSlice<'a> = &'a str;
 
@@ -31,8 +33,9 @@ pub fn is_tag_str(s: &String) -> Result<(), String> {
     let is_lower      = |s: &String| s.chars().all(|c| c.is_lowercase());
     let no_whitespace = |s: &String| s.chars().all(|c| !c.is_whitespace());
     let is_alphanum   = |s: &String| s.chars().all(|c| c.is_alphanumeric());
+    let matches_regex = |s: &String| Regex::new("^[a-zA-Z]([a-zA-Z0-9_-]*)$").unwrap().captures(s).is_some();
 
-    if is_lower.and(no_whitespace).and(is_alphanum).filter(s) {
+    if is_lower.and(no_whitespace).and(is_alphanum).and(matches_regex).filter(s) {
         Ok(())
     } else {
         Err(format!("The string '{}' is not a valid tag", s))

libimagentrytag/src/tagable.rs

@@ -27,7 +27,7 @@ use error::TagErrorKind;
 use error::MapErrInto;
 use result::Result;
 use tag::{Tag, TagSlice};
-use util::is_tag;
+use tag::is_tag_str;
 
 use toml::Value;
 
@@ -55,7 +55,7 @@ impl Tagable for Value {
                     return Err(TagErrorKind::TagTypeError.into());
                 }
                 if tags.iter().any(|t| match *t {
-                    Value::String(ref s) => !is_tag(s),
+                    Value::String(ref s) => !is_tag_str(s).is_ok(),
                     _ => unreachable!()})
                 {
                     return Err(TagErrorKind::NotATag.into());
@@ -77,8 +77,8 @@ impl Tagable for Value {
     }
 
     fn set_tags(&mut self, ts: &[Tag]) -> Result<()> {
-        if ts.iter().any(|tag| !is_tag(tag)) {
-            debug!("Not a tag: '{}'", ts.iter().filter(|t| !is_tag(t)).next().unwrap());
+        if ts.iter().any(|tag| !is_tag_str(tag).is_ok()) {
+            debug!("Not a tag: '{}'", ts.iter().filter(|t| !is_tag_str(t).is_ok()).next().unwrap());
             return Err(TagErrorKind::NotATag.into());
         }
 
@@ -90,7 +90,7 @@ impl Tagable for Value {
     }
 
     fn add_tag(&mut self, t: Tag) -> Result<()> {
-        if !is_tag(&t) {
+        if !try!(is_tag_str(&t).map(|_| true).map_err(|_| TagErrorKind::NotATag.into_error())) {
             debug!("Not a tag: '{}'", t);
             return Err(TagErrorKind::NotATag.into());
         }
@@ -104,7 +104,7 @@ impl Tagable for Value {
     }
 
     fn remove_tag(&mut self, t: Tag) -> Result<()> {
-        if !is_tag(&t) {
+        if !try!(is_tag_str(&t).map(|_| true).map_err(|_| TagErrorKind::NotATag.into_error())) {
             debug!("Not a tag: '{}'", t);
             return Err(TagErrorKind::NotATag.into());
         }

libimagentrytag/src/ui.rs

@@ -20,8 +20,7 @@
 use clap::{Arg, ArgMatches, App, SubCommand};
 
 use tag::Tag;
-
-use libimagutil::cli_validators::is_tag;
+use tag::is_tag;
 
 /// Generates a `clap::SubCommand` to be integrated in the commandline-ui builder for building a
 /// "tags --add foo --remove bar" subcommand to do tagging action.

libimagutil/src/cli_validators.rs

@@ -47,12 +47,3 @@ pub fn is_url(s: String) -> Result<(), String> {
     Url::parse(&s).map(|_| ()).map_err(|_| format!("Not a URL: {}", s))
 }
 
-pub fn is_tag(s: String) -> Result<(), String> {
-    use regex::Regex;
-    lazy_static! { static ref TAG_RE : Regex = Regex::new("[:alpha:][:word:]*").unwrap(); }
-
-    TAG_RE
-        .is_match(&s)
-        .as_result((), format!("Not a valid Tag: '{}' - Valid is [a-zA-Z][0-9a-zA-Z]*", s))
-}
-