Add filter: header::field_grep::FieldGrep

libimagentryfilter/src/builtin/header/field_grep.rs

@@ -0,0 +1,43 @@
+use regex::Regex;
+use toml::Value;
+
+use libimagstore::store::Entry;
+
+use builtin::header::field_path::FieldPath;
+use filter::Filter;
+
+/// Check whether certain header field in a entry is equal to a value
+pub struct FieldGrep {
+    header_field_path: FieldPath,
+    grep: Regex,
+}
+
+impl FieldGrep {
+
+    pub fn new(path: FieldPath, grep: Regex) -> FieldGrep {
+        FieldGrep {
+            header_field_path: path,
+            grep: grep,
+        }
+    }
+
+}
+
+impl Filter for FieldGrep {
+
+    fn filter(&self, e: &Entry) -> bool {
+        let header = e.get_header();
+        self.header_field_path
+            .walk(header)
+            .map(|v| {
+                match v {
+                    Value::String(s) => self.grep.captures(&s[..]).is_some(),
+                    _ => false,
+                }
+            })
+            .unwrap_or(false)
+    }
+
+}
+
+

libimagentryfilter/src/builtin/header/mod.rs

@@ -1,3 +1,4 @@
 pub mod field_eq;
+pub mod field_grep;
 pub mod field_path;