diff --git a/libimagentryfilter/Cargo.toml b/libimagentryfilter/Cargo.toml
new file mode 100644
index 00000000..00aae942
--- /dev/null
+++ b/libimagentryfilter/Cargo.toml
@@ -0,0 +1,15 @@
+[package]
+name = "libimagentryfilter"
+version = "0.1.0"
+authors = ["Matthias Beyer <mail@beyermatthias.de>"]
+
+[dependencies]
+clap = "1.5.5"
+itertools = "0.4.7"
+log = "0.3.4"
+regex = "0.1.48"
+toml = "0.1.27"
+
+[dependencies.libimagstore]
+path = "../libimagstore"
+
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/length/is_over.rs b/libimagentryfilter/src/builtin/content/length/is_over.rs
new file mode 100644
index 00000000..f8016805
--- /dev/null
+++ b/libimagentryfilter/src/builtin/content/length/is_over.rs
@@ -0,0 +1,28 @@
+use libimagstore::store::Entry;
+
+use builtin::header::field_path::FieldPath;
+use filter::Filter;
+
+pub struct ContentLengthIsOver {
+    val: usize
+}
+
+impl ContentLengthIsOver {
+
+    pub fn new(value: usize) -> ContentLengthIsOver {
+        ContentLengthIsOver {
+            val: value,
+        }
+    }
+
+}
+
+impl Filter for ContentLengthIsOver {
+
+    fn filter(&self, e: &Entry) -> bool {
+        e.get_content().len() > self.val
+    }
+
+}
+
+
diff --git a/libimagentryfilter/src/builtin/content/length/is_under.rs b/libimagentryfilter/src/builtin/content/length/is_under.rs
new file mode 100644
index 00000000..07ade8dc
--- /dev/null
+++ b/libimagentryfilter/src/builtin/content/length/is_under.rs
@@ -0,0 +1,28 @@
+use libimagstore::store::Entry;
+
+use builtin::header::field_path::FieldPath;
+use filter::Filter;
+
+pub struct ContentLengthIsUnder {
+    val: usize
+}
+
+impl ContentLengthIsUnder {
+
+    pub fn new(value: usize) -> ContentLengthIsUnder {
+        ContentLengthIsUnder {
+            val: value,
+        }
+    }
+
+}
+
+impl Filter for ContentLengthIsUnder {
+
+    fn filter(&self, e: &Entry) -> bool {
+        e.get_content().len() < self.val
+    }
+
+}
+
+
diff --git a/libimagentryfilter/src/builtin/content/length/mod.rs b/libimagentryfilter/src/builtin/content/length/mod.rs
new file mode 100644
index 00000000..94121f96
--- /dev/null
+++ b/libimagentryfilter/src/builtin/content/length/mod.rs
@@ -0,0 +1,2 @@
+pub mod is_over;
+pub mod is_under;
diff --git a/libimagentryfilter/src/builtin/content/mod.rs b/libimagentryfilter/src/builtin/content/mod.rs
new file mode 100644
index 00000000..b0ec6127
--- /dev/null
+++ b/libimagentryfilter/src/builtin/content/mod.rs
@@ -0,0 +1,2 @@
+pub mod grep;
+pub mod length;
diff --git a/libimagentryfilter/src/builtin/header/field_eq.rs b/libimagentryfilter/src/builtin/header/field_eq.rs
new file mode 100644
index 00000000..fc4e1e77
--- /dev/null
+++ b/libimagentryfilter/src/builtin/header/field_eq.rs
@@ -0,0 +1,36 @@
+use libimagstore::store::Entry;
+
+use builtin::header::field_path::FieldPath;
+use filter::Filter;
+
+use toml::Value;
+
+/// Check whether certain header field in a entry is equal to a value
+pub struct FieldEq {
+    header_field_path: FieldPath,
+    expected_value: Value
+}
+
+impl FieldEq {
+
+    pub fn new(path: FieldPath, expected_value: Value) -> FieldEq {
+        FieldEq {
+            header_field_path: path,
+            expected_value: expected_value,
+        }
+    }
+
+}
+
+impl Filter for FieldEq {
+
+    fn filter(&self, e: &Entry) -> bool {
+        let header = e.get_header();
+        self.header_field_path
+            .walk(header)
+            .map(|v| self.expected_value == v.clone())
+            .unwrap_or(false)
+    }
+
+}
+
diff --git a/libimagentryfilter/src/builtin/header/field_exists.rs b/libimagentryfilter/src/builtin/header/field_exists.rs
new file mode 100644
index 00000000..45bc870a
--- /dev/null
+++ b/libimagentryfilter/src/builtin/header/field_exists.rs
@@ -0,0 +1,31 @@
+use libimagstore::store::Entry;
+
+use builtin::header::field_path::FieldPath;
+use filter::Filter;
+
+use toml::Value;
+
+pub struct FieldExists {
+    header_field_path: FieldPath,
+}
+
+impl FieldExists {
+
+    pub fn new(path: FieldPath) -> FieldExists {
+        FieldExists {
+            header_field_path: path,
+        }
+    }
+
+}
+
+impl Filter for FieldExists {
+
+    fn filter(&self, e: &Entry) -> bool {
+        let header = e.get_header();
+        self.header_field_path.walk(header).is_some()
+    }
+
+}
+
+
diff --git a/libimagentryfilter/src/builtin/header/field_grep.rs b/libimagentryfilter/src/builtin/header/field_grep.rs
new file mode 100644
index 00000000..f1535602
--- /dev/null
+++ b/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)
+    }
+
+}
+
+
diff --git a/libimagentryfilter/src/builtin/header/field_isempty.rs b/libimagentryfilter/src/builtin/header/field_isempty.rs
new file mode 100644
index 00000000..83f74984
--- /dev/null
+++ b/libimagentryfilter/src/builtin/header/field_isempty.rs
@@ -0,0 +1,45 @@
+use libimagstore::store::Entry;
+
+use builtin::header::field_path::FieldPath;
+use filter::Filter;
+
+use toml::Value;
+
+pub struct FieldIsEmpty {
+    header_field_path: FieldPath,
+}
+
+impl FieldIsEmpty {
+
+    pub fn new(path: FieldPath) -> FieldIsEmpty {
+        FieldIsEmpty {
+            header_field_path: path,
+        }
+    }
+
+}
+
+impl Filter for FieldIsEmpty {
+
+    fn filter(&self, e: &Entry) -> bool {
+        let header = e.get_header();
+        self.header_field_path
+            .walk(header)
+            .map(|v| {
+                match v {
+                    Value::Array(a)   => a.is_empty(),
+                    Value::Boolean(_) => false,
+                    Value::Float(_)   => false,
+                    Value::Integer(_) => false,
+                    Value::String(_)  => false,
+                    Value::Table(t)   => t.is_empty(),
+                    _                 => true,
+                }
+            })
+            .unwrap_or(false)
+    }
+
+}
+
+
+
diff --git a/libimagentryfilter/src/builtin/header/field_istype.rs b/libimagentryfilter/src/builtin/header/field_istype.rs
new file mode 100644
index 00000000..23191611
--- /dev/null
+++ b/libimagentryfilter/src/builtin/header/field_istype.rs
@@ -0,0 +1,62 @@
+use libimagstore::store::Entry;
+
+use builtin::header::field_path::FieldPath;
+use filter::Filter;
+
+use toml::Value;
+
+pub enum Type {
+    Array,
+    Boolean,
+    Float,
+    Integer,
+    None,
+    String,
+    Table,
+}
+
+impl Type {
+
+    fn matches(&self, v: &Value) -> bool {
+        match (self, v) {
+            (&Type::String,  &Value::String(_))  => true,
+            (&Type::Integer, &Value::Integer(_)) => true,
+            (&Type::Float,   &Value::Float(_))   => true,
+            (&Type::Boolean, &Value::Boolean(_)) => true,
+            (&Type::Array,   &Value::Array(_))   => true,
+            (&Type::Table,   &Value::Table(_))   => true,
+            _                                    => false,
+        }
+    }
+
+}
+
+pub struct FieldIsType {
+    header_field_path: FieldPath,
+    expected_type: Type,
+}
+
+impl FieldIsType {
+
+    pub fn new(path: FieldPath, expected_type: Type) -> FieldIsType {
+        FieldIsType {
+            header_field_path: path,
+            expected_type: expected_type,
+        }
+    }
+
+}
+
+impl Filter for FieldIsType {
+
+    fn filter(&self, e: &Entry) -> bool {
+        let header = e.get_header();
+        self.header_field_path
+            .walk(header)
+            .map(|v| self.expected_type.matches(&v))
+            .unwrap_or(false)
+    }
+
+}
+
+
diff --git a/libimagentryfilter/src/builtin/header/field_path/element.rs b/libimagentryfilter/src/builtin/header/field_path/element.rs
new file mode 100644
index 00000000..d6ad599a
--- /dev/null
+++ b/libimagentryfilter/src/builtin/header/field_path/element.rs
@@ -0,0 +1,47 @@
+use std::fmt::{Display, Formatter};
+use std::fmt::Error as FmtError;
+
+use toml::Value;
+
+#[derive(Clone, Debug)]
+pub struct FieldPathElement {
+    name: String
+}
+
+impl FieldPathElement {
+
+    pub fn new(name: String) -> FieldPathElement {
+        FieldPathElement { name: name }
+    }
+
+    pub fn apply(&self, value: Value) -> Option<Value> {
+        use std::str::FromStr;
+        use std::ops::Index;
+
+        match value {
+            Value::Table(t) => {
+                t.get(&self.name).map(|a| a.clone())
+            },
+
+            Value::Array(a) => {
+                usize::from_str(&self.name[..])
+                    .ok()
+                    .and_then(|i| Some(a[i].clone()))
+            },
+
+            _ => None,
+        }
+    }
+
+}
+
+impl Display for FieldPathElement {
+
+    fn fmt(&self, fmt: &mut Formatter) -> Result<(), FmtError> {
+        try!(write!(fmt, "{}", self.name));
+        Ok(())
+    }
+
+}
+
+
diff --git a/libimagentryfilter/src/builtin/header/field_path/error.rs b/libimagentryfilter/src/builtin/header/field_path/error.rs
new file mode 100644
index 00000000..69703cbf
--- /dev/null
+++ b/libimagentryfilter/src/builtin/header/field_path/error.rs
@@ -0,0 +1,39 @@
+use std::fmt::{Display, Formatter};
+use std::fmt::Error as FmtError;
+use std::error::Error;
+
+use builtin::header::field_path::element::FieldPathElement;
+
+#[derive(Debug)]
+pub struct FieldPathParsingError {
+    source: String,
+    token: FieldPathElement
+}
+
+impl FieldPathParsingError {
+
+    pub fn new(source: String, token: FieldPathElement) -> FieldPathParsingError {
+        FieldPathParsingError { source: source, token: token }
+    }
+}
+
+impl Display for FieldPathParsingError {
+
+    fn fmt(&self, fmt: &mut Formatter) -> Result<(), FmtError> {
+        try!(write!(fmt, "Failed to compile '{}', failed at: '{}'", self.source, self.token));
+        Ok(())
+    }
+
+}
+
+impl Error for FieldPathParsingError {
+
+    fn description(&self) -> &str {
+        &self.source[..]
+    }
+
+    fn cause(&self) -> Option<&Error> {
+        None
+    }
+
+}
diff --git a/libimagentryfilter/src/builtin/header/field_path/mod.rs b/libimagentryfilter/src/builtin/header/field_path/mod.rs
new file mode 100644
index 00000000..0760c596
--- /dev/null
+++ b/libimagentryfilter/src/builtin/header/field_path/mod.rs
@@ -0,0 +1,44 @@
+use std::fmt::{Display, Formatter};
+use std::fmt::Error as FmtError;
+use std::error::Error;
+
+use toml::Value;
+
+pub mod element;
+pub mod error;
+
+use libimagstore::store::Entry;
+use libimagstore::store::EntryHeader;
+
+use builtin::header::field_path::element::FieldPathElement;
+use builtin::header::field_path::error::FieldPathParsingError;
+
+pub struct FieldPath {
+    elements: Vec<FieldPathElement>,
+}
+
+impl FieldPath {
+
+    pub fn new(elements: Vec<FieldPathElement>) -> FieldPath {
+        FieldPath {
+            elements: elements,
+        }
+    }
+
+    pub fn compile(source: String) -> Result<FieldPath, FieldPathParsingError> {
+        unimplemented!()
+    }
+
+    pub fn walk(&self, e: &EntryHeader) -> Option<Value> {
+        let init_val : Value = Value::Table(e.toml().clone());
+
+        self.elements
+            .clone()
+            .into_iter()
+            .fold(Some(init_val), |acc: Option<Value>, token: FieldPathElement| {
+                acc.and_then(|element| token.apply(element))
+            })
+    }
+
+}
+
diff --git a/libimagentryfilter/src/builtin/header/mod.rs b/libimagentryfilter/src/builtin/header/mod.rs
new file mode 100644
index 00000000..886e5ce6
--- /dev/null
+++ b/libimagentryfilter/src/builtin/header/mod.rs
@@ -0,0 +1,6 @@
+pub mod field_eq;
+pub mod field_exists;
+pub mod field_grep;
+pub mod field_isempty;
+pub mod field_istype;
+pub mod field_path;
diff --git a/libimagentryfilter/src/builtin/mod.rs b/libimagentryfilter/src/builtin/mod.rs
new file mode 100644
index 00000000..260f1a1b
--- /dev/null
+++ b/libimagentryfilter/src/builtin/mod.rs
@@ -0,0 +1,2 @@
+pub mod content;
+pub mod header;
diff --git a/libimagentryfilter/src/cli.rs b/libimagentryfilter/src/cli.rs
new file mode 100644
index 00000000..e69de29b
diff --git a/libimagentryfilter/src/filter.rs b/libimagentryfilter/src/filter.rs
new file mode 100644
index 00000000..2d0015a1
--- /dev/null
+++ b/libimagentryfilter/src/filter.rs
@@ -0,0 +1,54 @@
+use libimagstore::store::Entry;
+
+pub use ops::and::And;
+pub use ops::not::Not;
+pub use ops::or::Or;
+
+pub trait Filter {
+
+    fn filter(&self, &Entry) -> bool;
+
+    fn not(self) -> Not
+        where Self: Sized + 'static
+    {
+        Not::new(Box::new(self))
+    }
+
+    fn or(self, other: Box<Filter>) -> Or
+        where Self: Sized + 'static
+    {
+        Or::new(Box::new(self), other)
+    }
+
+    fn or_not(self, other: Box<Filter>) -> Or
+        where Self: Sized + 'static
+    {
+        self.or(Box::new(Not::new(other)))
+    }
+
+    fn or3(self, other: Box<Filter>, other2: Box<Filter>) -> Or
+        where Self: Sized + 'static
+    {
+        Or::new(Box::new(self), Box::new(Or::new(other, other2)))
+    }
+
+    fn and(self, other: Box<Filter>) -> And
+        where Self: Sized + 'static
+    {
+        And::new(Box::new(self), other)
+    }
+
+    fn and3(self, other: Box<Filter>, other2: Box<Filter>) -> And
+        where Self: Sized + 'static
+    {
+        And::new(Box::new(self), Box::new(And::new(other, other2)))
+    }
+
+    fn and_not(self, other: Box<Filter>) -> And
+        where Self: Sized + 'static
+    {
+        self.and(Box::new(Not::new(other)))
+    }
+
+}
+
diff --git a/libimagentryfilter/src/lib.rs b/libimagentryfilter/src/lib.rs
new file mode 100644
index 00000000..0a3c4316
--- /dev/null
+++ b/libimagentryfilter/src/lib.rs
@@ -0,0 +1,12 @@
+#[macro_use] extern crate log;
+
+extern crate itertools;
+extern crate regex;
+extern crate toml;
+
+extern crate libimagstore;
+
+pub mod cli;
+pub mod builtin;
+pub mod filter;
+pub mod ops;
diff --git a/libimagentryfilter/src/ops/and.rs b/libimagentryfilter/src/ops/and.rs
new file mode 100644
index 00000000..79470b9b
--- /dev/null
+++ b/libimagentryfilter/src/ops/and.rs
@@ -0,0 +1,24 @@
+use libimagstore::store::Entry;
+
+use filter::Filter;
+
+pub struct And {
+    a: Box<Filter>,
+    b: Box<Filter>
+}
+
+impl And {
+
+    pub fn new(a: Box<Filter>, b: Box<Filter>) -> And {
+        And { a: a, b: b }
+    }
+
+}
+
+impl Filter for And {
+
+    fn filter(&self, e: &Entry) -> bool {
+        self.a.filter(e) && self.b.filter(e)
+    }
+
+}
diff --git a/libimagentryfilter/src/ops/mod.rs b/libimagentryfilter/src/ops/mod.rs
new file mode 100644
index 00000000..668eedc5
--- /dev/null
+++ b/libimagentryfilter/src/ops/mod.rs
@@ -0,0 +1,3 @@
+pub mod and;
+pub mod not;
+pub mod or;
diff --git a/libimagentryfilter/src/ops/not.rs b/libimagentryfilter/src/ops/not.rs
new file mode 100644
index 00000000..a709d95b
--- /dev/null
+++ b/libimagentryfilter/src/ops/not.rs
@@ -0,0 +1,23 @@
+use libimagstore::store::Entry;
+
+use filter::Filter;
+
+pub struct Not {
+    a: Box<Filter>
+}
+
+impl Not {
+
+    pub fn new(a: Box<Filter>) -> Not {
+        Not { a: a }
+    }
+
+}
+
+impl Filter for Not {
+
+    fn filter(&self, e: &Entry) -> bool {
+        !self.a.filter(e)
+    }
+
+}
diff --git a/libimagentryfilter/src/ops/or.rs b/libimagentryfilter/src/ops/or.rs
new file mode 100644
index 00000000..e2ca810b
--- /dev/null
+++ b/libimagentryfilter/src/ops/or.rs
@@ -0,0 +1,24 @@
+use libimagstore::store::Entry;
+
+use filter::Filter;
+
+pub struct Or {
+    a: Box<Filter>,
+    b: Box<Filter>
+}
+
+impl Or {
+
+    pub fn new(a: Box<Filter>, b: Box<Filter>) -> Or {
+        Or { a: a, b: b }
+    }
+
+}
+
+impl Filter for Or {
+
+    fn filter(&self, e: &Entry) -> bool {
+        self.a.filter(e) || self.b.filter(e)
+    }
+
+}