Add builtin content filter: grep

2 files changed, 58 insertions, 0 deletions

diff --git a/libimagentryfilter/src/builtin/content/grep.rs b/libimagentryfilter/src/builtin/content/grep.rs
new file mode 100644
index 00000000..a3d89af4
--- /dev/null
+++ b/libimagentryfilter/src/builtin/content/grep.rs
@@ -0,0 +1,57 @@
+use std::convert::Into;
+
+use regex::Regex;
+use regex::Error as RError;
+
+use libimagstore::store::Entry;
+
+use builtin::header::field_path::FieldPath;
+use filter::Filter;
+
+pub trait IntoRegex {
+
+    fn into_regex(self) -> Result<Regex, RError>;
+
+}
+
+impl<'a> IntoRegex for &'a str {
+
+    fn into_regex(self) -> Result<Regex, RError> {
+        Regex::new(self)
+    }
+}
+
+impl<'a> IntoRegex for Regex {
+
+    fn into_regex(self) -> Result<Regex, RError> {
+        Ok(self)
+    }
+}
+
+pub struct ContentGrep {
+    regex: Regex,
+}
+
+impl ContentGrep {
+
+    pub fn new<IR>(regex: IR) -> Result<ContentGrep, RError>
+        where IR: IntoRegex
+    {
+        regex.into_regex()
+            .map(|reg| {
+                ContentGrep {
+                    regex: reg,
+                }
+            })
+    }
+
+}
+
+impl Filter for ContentGrep {
+
+    fn filter(&self, e: &Entry) -> bool {
+        self.regex.captures(&e.get_content()[..]).is_some()
+    }
+
+}
+
diff --git a/libimagentryfilter/src/builtin/content/mod.rs b/libimagentryfilter/src/builtin/content/mod.rs
index e69de29b..21e9e600 100644
--- a/libimagentryfilter/src/builtin/content/mod.rs
+++ b/libimagentryfilter/src/builtin/content/mod.rs
@@ -0,0 +1 @@
+pub mod grep;