diff --git a/pgr-bin/src/bin/pgr-pbundle-shmmr2dist.rs b/pgr-bin/src/bin/pgr-pbundle-shmmr2dist.rs
new file mode 100644
index 0000000..f280730
--- /dev/null
+++ b/pgr-bin/src/bin/pgr-pbundle-shmmr2dist.rs
@@ -0,0 +1,384 @@
+const VERSION_STRING: &str = env!("VERSION_STRING");
+use clap::{self, CommandFactory, Parser};
+use kodama::{linkage, Method};
+use rustc_hash::{FxHashMap, FxHashSet};
+use std::io::{BufRead, BufReader, BufWriter, Write};
+use std::path::Path;
+use std::{fs::File, path};
+
+/// Generate alignment scores between sequences using bundle decomposition from a principal bundle bed file
+#[derive(Parser, Debug)]
+#[clap(name = "pgr-pbundle-bed2dist")]
+#[clap(author, version)]
+#[clap(about, long_about = None)]
+struct CmdOptions {
+    /// the path to the principal bundle bed file
+    idx_file_path: String,
+    /// the prefix of the output file
+    output_prefix: String,
+}
+
+type Smps = Vec<(String, u32, u32, u8)>; // shmmr_string, bgn, end, orientation
+
+fn align_smps(smps0: &Smps, smps1: &Smps) -> (f32, usize, usize, i64, isize) {
+    // return: dist, diff_len, max_len, best_score, best_offset
+    let mut smp_to_frags0 = FxHashMap::<(String, u8), Vec<(u32, u32)>>::default();
+    let mut smp_to_frags1 = FxHashMap::<(String, u8), Vec<(u32, u32)>>::default();
+    let mut all_smps = FxHashSet::<(String, u8)>::default();
+    let mut length0 = 0_u32;
+    let mut length1 = 0_u32;
+    smps0.iter().for_each(|(frag_id, bgn, end, orientation)| {
+        let e = smp_to_frags0
+            .entry((frag_id.clone(), *orientation))
+            .or_default();
+        e.push((*bgn, *end));
+        all_smps.insert((frag_id.clone(), *orientation));
+        length0 += *end - *bgn;
+    });
+
+    smps1.iter().for_each(|(frag_id, bgn, end, orientation)| {
+        let e = smp_to_frags1
+            .entry((frag_id.clone(), *orientation))
+            .or_default();
+        e.push((*bgn, *end));
+        all_smps.insert((frag_id.clone(), *orientation));
+        length1 += *end - *bgn;
+    });
+
+    let mut match_score = 0_i32;
+    let mut diff_len = 0_u32;
+    let mut offsets = Vec::<(i32, u32)>::new();
+    for smp in all_smps {
+        if smp_to_frags0.contains_key(&smp) && smp_to_frags1.contains_key(&smp) {
+            let frags0 = &smp_to_frags0[&smp];
+            let frags1 = &smp_to_frags1[&smp];
+            let l0 = frags0.iter().map(|v| v.1 - v.0).sum::<u32>();
+            let l1 = frags1.iter().map(|v| v.1 - v.0).sum::<u32>();
+
+            if frags0.len() == frags1.len() {
+                match_score += (l0 + l1) as i32;
+                for i in 0..frags0.len() {
+                    let (bgn0, _end0) = frags0[i];
+                    let (bgn1, _end1) = frags1[i];
+                    if frags0.len() == 1 {
+                        // only use unique ones
+                        offsets.push((bgn1 as i32 - bgn0 as i32, l0 + l1));
+                    }
+                }
+            } else {
+                match_score += u32::min(l0, l1) as i32 - l0.abs_diff(l1) as i32;
+                diff_len += l0.abs_diff(l1);
+            };
+        } else if smp_to_frags0.contains_key(&smp) {
+            let frags0 = &smp_to_frags0[&smp];
+            let l0 = frags0.iter().map(|v| v.1 - v.0).sum::<u32>();
+            match_score -= l0 as i32;
+            diff_len += l0;
+        } else if smp_to_frags1.contains_key(&smp) {
+            let frags1 = &smp_to_frags1[&smp];
+            let l1 = frags1.iter().map(|v| v.1 - v.0).sum::<u32>();
+            match_score -= l1 as i32;
+            diff_len += l1;
+        }
+    }
+
+    offsets.sort();
+    let mut offset_clusters = Vec::<Vec<(i32, u32)>>::new();
+    const MERGE_LENGTH: i32 = 16;
+
+    let mut current_cluster = Vec::<(i32, u32)>::new();
+    let mut current_offset: Option<i32> = None;
+    for (offset, length) in offsets {
+        if let Some(last_offset) = current_offset {
+            if offset - last_offset < MERGE_LENGTH {
+                current_offset = Some(offset);
+                current_cluster.push((offset, length));
+            } else {
+                offset_clusters.push(current_cluster.clone());
+                current_cluster.clear();
+                current_offset = Some(offset);
+                current_cluster.push((offset, length));
+            }
+        } else {
+            current_offset = Some(offset);
+            current_cluster.push((offset, length));
+        };
+    }
+    if !current_cluster.is_empty() {
+        offset_clusters.push(current_cluster);
+    };
+    if offset_clusters.is_empty() {
+        return (1.0, diff_len as usize, usize::MAX, match_score as i64, 0);
+    };
+    offset_clusters.sort_by_key(|v| -(v.len() as isize));
+    let best_cluster = &offset_clusters[0];
+    let ave_offset = best_cluster.iter().map(|v| v.0).sum::<i32>() / best_cluster.len() as i32;
+    let max_len = best_cluster.iter().map(|v| v.1).sum::<u32>();
+    let dist = 1.0 - 0.5 * (match_score as f32 / (length0 + length1) as f32 + 1.0_f32);
+    // return: dist, diff_len, max_len, best_score, best_offset
+    (
+        dist,
+        diff_len as usize,
+        max_len as usize,
+        match_score as i64,
+        ave_offset as isize,
+    )
+}
+
+type Contigs = FxHashMap<u32, (String, String, u32)>; // contig_id -> contig_name, source, length
+type FragMap = FxHashMap<String, (u32, u32, u32, u8)>; // shmmr string -> seq_id, bgn, end, orientation
+type CtgToFrags = FxHashMap<String, Smps>; // contig_id -> shmmr_string, bgn, end, orientation
+
+fn main() -> Result<(), std::io::Error> {
+    CmdOptions::command().version(VERSION_STRING).get_matches();
+    let args = CmdOptions::parse();
+    let shmmr_idx_filename = path::Path::new(&args.idx_file_path);
+    let shmmr_idx_file =
+        BufReader::new(File::open(shmmr_idx_filename).expect("can't open the bed file"));
+    //let mut ctg_data = FxHashMap::<String, Vec<_>>::default();
+    let shmmr_idx_file_parse_err_msg = "shmmr idx file parsing error";
+    let mut contigs = Contigs::default();
+    let mut frag_map = FragMap::default();
+    let mut ctg_to_frags = CtgToFrags::default();
+    shmmr_idx_file.lines().for_each(|line| {
+        let line = line.unwrap().trim().to_string();
+        if line.is_empty() {
+            return;
+        }
+        let t = &line[0..1];
+        match t {
+            "#" | "K" => {}
+            "C" => {
+                let idx_fields = line.split('\t').collect::<Vec<&str>>();
+                let ctg_id: u32 = idx_fields[1].parse().expect(shmmr_idx_file_parse_err_msg);
+                let ctg_name: String = idx_fields[2].to_string();
+                let source = idx_fields[3].to_string();
+                let length: u32 = idx_fields[4].parse().expect(shmmr_idx_file_parse_err_msg);
+                contigs.entry(ctg_id).or_insert((ctg_name, source, length));
+            }
+            "F" => {
+                let idx_fields = line.split('\t').collect::<Vec<&str>>();
+                let frag_id = idx_fields[1].to_string();
+                let seq_id: u32 = idx_fields[3].parse().expect(shmmr_idx_file_parse_err_msg);
+                let bgn: u32 = idx_fields[4].parse().expect(shmmr_idx_file_parse_err_msg);
+                let end: u32 = idx_fields[5].parse().expect(shmmr_idx_file_parse_err_msg);
+                let orientation: u8 = idx_fields[6].parse().expect(shmmr_idx_file_parse_err_msg);
+                frag_map
+                    .entry(frag_id.clone())
+                    .or_insert((seq_id, bgn, end, orientation));
+                let ctg = contigs
+                    .get(&seq_id)
+                    .expect(shmmr_idx_file_parse_err_msg)
+                    .0
+                    .clone();
+                let e = ctg_to_frags.entry(ctg.clone()).or_default();
+                e.push((frag_id, bgn, end, orientation));
+            }
+            _ => panic!("{}", shmmr_idx_file_parse_err_msg),
+        }
+    });
+
+    let ctg_to_frags = ctg_to_frags
+        .into_iter()
+        .map(|(k, mut v)| {
+            v.sort_by_key(|k| k.1);
+            (k, v)
+        })
+        .collect::<Vec<_>>();
+
+    let n_ctg = ctg_to_frags.len();
+
+    let out_path = Path::new(&args.output_prefix).with_extension("dist");
+    let mut out_file = BufWriter::new(File::create(out_path).expect("can't create the dist file"));
+
+    let mut dist_map = FxHashMap::<(usize, usize), f32>::default();
+    let mut offset_map = FxHashMap::<(usize, usize), isize>::default();
+    let mut min_dist = 0.0_f32;
+    let mut max_dist = 1.0_f32;
+    (0..n_ctg)
+        .flat_map(|ctg_idx0| (0..n_ctg).map(move |ctg_idx1| (ctg_idx0, ctg_idx1)))
+        .for_each(|(ctg_idx0, ctg_idx1)| {
+            if ctg_idx0 > ctg_idx1 {
+                return;
+            };
+            let (ctg0, ctg0_smps) = &ctg_to_frags[ctg_idx0];
+            let (ctg1, ctg1_smps) = &ctg_to_frags[ctg_idx1];
+            let (dist, diff_len, max_len, best_score, best_offset) =
+                align_smps(ctg0_smps, ctg1_smps);
+            writeln!(
+                out_file,
+                "{} {} {} {} {} {} {}",
+                ctg0, ctg1, dist, diff_len, max_len, best_score, best_offset
+            )
+            .expect("writing error");
+
+            if ctg_idx1 != ctg_idx0 {
+                writeln!(
+                    out_file,
+                    "{} {} {} {} {} {} {}",
+                    ctg1, ctg0, dist, diff_len, max_len, best_score, -best_offset
+                )
+                .expect("writing error");
+                min_dist = if dist < min_dist { dist } else { min_dist };
+                max_dist = if dist > max_dist { dist } else { max_dist };
+                dist_map.insert((ctg_idx0, ctg_idx1), dist);
+                offset_map.insert((ctg_idx0, ctg_idx1), best_offset);
+                offset_map.insert((ctg_idx1, ctg_idx0), -best_offset);
+            }
+        });
+
+    let w = max_dist - min_dist + 0.01;
+    dist_map.iter_mut().for_each(|(_k, v)| {
+        *v = (*v - min_dist + 0.01) / w;
+    });
+    let mut dist_mat = vec![];
+    (0..n_ctg - 1).for_each(|i| {
+        (i + 1..n_ctg).for_each(|j| {
+            dist_mat.push(*dist_map.get(&(i, j)).unwrap());
+        })
+    });
+    let dend = linkage(&mut dist_mat, n_ctg, Method::Average);
+
+    let steps = dend.steps().to_vec();
+    let mut node_data = FxHashMap::<usize, (String, Vec<usize>, f32)>::default();
+    (0..n_ctg).for_each(|ctg_idx| {
+        node_data.insert(ctg_idx, (format!("{}", ctg_idx), vec![ctg_idx], 0.0_f32));
+    });
+
+    let mut last_node_id = 0_usize;
+    steps.iter().enumerate().for_each(|(c, s)| {
+        let (node_string1, nodes1, height1) = node_data.remove(&s.cluster1).unwrap();
+        let (node_string2, nodes2, height2) = node_data.remove(&s.cluster2).unwrap();
+        let new_node_id = c + n_ctg;
+        let mut nodes = Vec::<usize>::new();
+        let new_node_string = if nodes1.len() > nodes2.len() {
+            nodes.extend(nodes1);
+            nodes.extend(nodes2);
+            format!(
+                "({}:{}, {}:{})",
+                node_string1,
+                s.dissimilarity - height1,
+                node_string2,
+                s.dissimilarity - height2
+            )
+        } else {
+            nodes.extend(nodes2);
+            nodes.extend(nodes1);
+            format!(
+                "({}:{}, {}:{})",
+                node_string2,
+                s.dissimilarity - height2,
+                node_string1,
+                s.dissimilarity - height1
+            )
+        };
+        node_data.insert(new_node_id, (new_node_string, nodes, s.dissimilarity));
+        last_node_id = new_node_id;
+    });
+
+    let mut tree_file = BufWriter::new(
+        File::create(Path::new(&args.output_prefix).with_extension("nwk"))
+            .expect("can't create the nwk file"),
+    );
+
+    let emptyp_string = ("".to_string(), vec![], 0.0);
+    let (tree_string, nodes, _) = node_data.get(&last_node_id).unwrap_or(&emptyp_string);
+    writeln!(tree_file, "{};", tree_string).expect("can't write the nwk file");
+
+    let mut dendrogram_file = BufWriter::new(
+        File::create(Path::new(&args.output_prefix).with_extension("ddg"))
+            .expect("can't create the dendrogram file"),
+    );
+
+    let mut offset_file = BufWriter::new(
+        File::create(Path::new(&args.output_prefix).with_extension("offset"))
+            .expect("can't create the alignment offset file"),
+    );
+
+    let mut node_position_size = FxHashMap::<usize, ((f32, f32), usize)>::default();
+    let mut position = 0.0_f32;
+    let mut offset = 0_isize;
+    let mut p_idx: Option<usize> = None;
+    let mut offset_group = Vec::<_>::new();
+    let mut group_min_offset = 100000_isize;
+    nodes.iter().for_each(|&ctg_idx| {
+        node_position_size.insert(ctg_idx, ((position, 0.0), 1));
+        writeln!(
+            dendrogram_file,
+            "L\t{}\t{}",
+            ctg_idx, ctg_to_frags[ctg_idx].0
+        )
+        .expect("can't write the dendrogram file");
+        position += 1.0;
+        if let Some(p_idx) = p_idx {
+            let (idx0, idx1) = if p_idx < ctg_idx {
+                (p_idx, ctg_idx)
+            } else {
+                (ctg_idx, p_idx)
+            };
+            if *dist_map.get(&(idx0, idx1)).unwrap_or(&1.0) < 0.25 {
+                offset += *offset_map.get(&(p_idx, ctg_idx)).unwrap_or(&0);
+                offset_group.push((ctg_idx, offset));
+                if offset < group_min_offset {
+                    group_min_offset = offset;
+                };
+            } else {
+                offset_group.iter().for_each(|&(ctg_idx, offset)| {
+                    writeln!(
+                        offset_file,
+                        "{}\t{}",
+                        ctg_to_frags[ctg_idx].0,
+                        offset - group_min_offset
+                    )
+                    .expect("can't write the offset file");
+                });
+                group_min_offset = 100000_isize;
+                offset_group.clear();
+                offset = 0;
+            }
+        } else {
+            offset_group.push((ctg_idx, offset));
+        };
+        p_idx = Some(ctg_idx)
+    });
+
+    offset_group.iter().for_each(|&(ctg_idx, offset)| {
+        writeln!(
+            offset_file,
+            "{}\t{}",
+            ctg_to_frags[ctg_idx].0,
+            offset - group_min_offset
+        )
+        .expect("can't write the offset file");
+    });
+
+    steps.into_iter().enumerate().for_each(|(c, s)| {
+        let ((pos0, _), size0) = *node_position_size.get(&s.cluster1).unwrap();
+        let ((pos1, _), size1) = *node_position_size.get(&s.cluster2).unwrap();
+
+        let pos = ((size0 as f32) * pos0 + (size1 as f32) * pos1) / ((size0 + size1) as f32);
+        writeln!(
+            dendrogram_file,
+            "I\t{}\t{}\t{}\t{}\t{}",
+            c + n_ctg,
+            s.cluster1,
+            s.cluster2,
+            s.size,
+            s.dissimilarity,
+        )
+        .expect("can't write the dendrogram file");
+        node_position_size.insert(c + n_ctg, ((pos, s.dissimilarity), s.size));
+    });
+    let mut node_positions = node_position_size
+        .into_iter()
+        .collect::<Vec<(usize, ((f32, f32), usize))>>();
+    node_positions.sort_by(|a, b| a.0.partial_cmp(&b.0).unwrap());
+
+    node_positions
+        .into_iter()
+        .for_each(|(vid, ((pos, h), size))| {
+            writeln!(dendrogram_file, "P\t{}\t{}\t{}\t{}", vid, pos, h, size)
+                .expect("can't write the dendrogram file");
+        });
+    Ok(())
+}