Add subcommand to mask sequences

src/masker.hpp

@@ -0,0 +1,57 @@
+#ifndef VG_MASKER_HPP_INCLUDED
+#define VG_MASKER_HPP_INCLUDED
+
+#include <memory>
+
+#include <gbwtgraph/gbwtgraph.h>
+
+#include "handle.hpp"
+#include "snarls.hpp"
+#include "region.hpp"
+
+namespace vg {
+
+/*
+ * Class to mask out graph regions with N's
+ */
+class Masker {
+
+public:
+
+    // construct own snarl decomposition
+    // use external snarl decomposition
+    Masker(gbwtgraph::GBWTGraph& graph, const SnarlManager* snarl_manager = nullptr);
+    Masker(MutablePathDeletableHandleGraph& graph, const SnarlManager* snarl_manager = nullptr);
+    Masker() = default;
+    ~Masker() = default;
+
+    // move
+    Masker(Masker&& other) = default;
+    Masker& operator=(Masker&& other) = default;
+
+    // replace regions with N's, with regions given as tuples of (path name, region begin, region end).
+    // regions indexes are assumed to be 0-based and end-exclusive
+    void mask_sequences(const std::vector<std::tuple<std::string, size_t, size_t>>& regions) const;
+
+private:
+
+    // make our own snarl manager
+    void init_snarls();
+
+    // takes tuples of (first step, offset in first step, last step, end in last step)
+    // uses the lambda function provided to apply mask sequences to the graph
+    void apply_mask_sequences(const std::vector<std::tuple<step_handle_t, size_t, step_handle_t, size_t>>& mask_intervals,
+                              const std::function<void(handle_t, const std::string&)>& apply_mask) const;
+
+    PathHandleGraph* graph = nullptr;
+    const SnarlManager* snarl_manager = nullptr;
+
+    // if not given a snarl manager, we construct one and make the snarl_manager
+    // point to it
+    std::unique_ptr<SnarlManager> own_snarl_manager;
+
+};
+
+}
+
+#endif

src/subcommand/mask_main.cpp

@@ -0,0 +1,177 @@
+#include "subcommand.hpp"
+#include "../io/save_handle_graph.hpp"
+#include "../handle.hpp"
+#include "../xg.hpp"
+#include "../utility.hpp"
+#include "../snarls.hpp"
+#include "../masker.hpp"
+#include <vg/io/stream.hpp>
+#include <vg/io/vpkg.hpp>
+#include <gbwtgraph/gbz.h>
+
+#include <unistd.h>
+#include <getopt.h>
+#include <sstream>
+
+using namespace vg;
+using namespace vg::subcommand;
+using namespace vg::io;
+using namespace std;
+
+vector<tuple<string, size_t, size_t>> parse_bed(istream& in){
+
+    vector<tuple<string, size_t, size_t>> regions;
+
+    string line_buffer;
+    string token_buffer;
+    while (getline(in, line_buffer)) {
+
+        if (line_buffer.empty() || line_buffer.front() == '#' || line_buffer.substr(0, 5) == "track" || line_buffer.substr(0, 7) == "browser") {
+            // header line
+            continue;
+        }
+        istringstream line_strm(line_buffer);
+
+        regions.emplace_back();
+
+        getline(line_strm, token_buffer, '\t');
+        get<0>(regions.back()) = token_buffer;
+        getline(line_strm, token_buffer, '\t');
+        get<1>(regions.back()) = parse<int64_t>(token_buffer);
+        getline(line_strm, token_buffer, '\t');
+        get<2>(regions.back()) = parse<int64_t>(token_buffer);
+    }
+
+    return regions;
+}
+
+void help_mask(char** argv) {
+  cerr << "usage: " << argv[0] << " [options] <graph>" << endl
+       << "Mask out specified regions of a graph with N's" << endl
+       << endl
+       << "input options: " << endl
+       << "    -b, --bed FILE       BED regions corresponding to path intervals of the graph to target (required)" << endl
+       << "    -g, --gbz-input      Input graph is in GBZ format" << endl
+       << "    -s, --snarls FILE    Snarls from vg snarls (computed directly if not provided)" << endl
+
+       << endl;
+}    
+
+int main_mask(int argc, char** argv) {
+
+    string bed_filepath;
+    string snarls_filepath;
+    bool gbz_input = false;
+
+    int c;
+    optind = 2; // force optind past command positional argument
+    while (true) {
+        static struct option long_options[] =
+        {
+            {"help", no_argument, 0, 'h'},
+            {"bed", required_argument, 0, 'b'},
+            {"gbz-input", no_argument, 0, 'g'},
+            {"snarls", required_argument, 0, 's'},
+            {0, 0, 0, 0}
+
+        };
+        int option_index = 0;
+        c = getopt_long (argc, argv, "hb:gs:", long_options, &option_index);
+
+        // Detect the end of the options.
+        if (c == -1)
+            break;
+
+        switch (c)
+        {
+
+            case '?':
+            case 'h':
+                help_mask(argv);
+                return 0;
+            case 'b':
+                bed_filepath = optarg;
+                break;
+            case 'g':
+                gbz_input = true;
+                break;
+            case 's':
+                snarls_filepath = optarg;
+                break;
+            default:
+                help_mask(argv);
+                return 1;
+        }
+    }
+
+
+    if (argc - optind != 1) {
+        cerr << "error: vg mask requires exactly 1 positional argument" << endl;
+        help_mask(argv);
+        return 1;
+    }
+
+    if (bed_filepath.empty()) {
+        cerr << "error: vg mask requires an input BED file from -b / --bed" << endl;
+        return 1;
+    }
+    if (bed_filepath != "-") {
+        if (!ifstream(bed_filepath)) {
+            cerr << "error: could not open BED file from " << bed_filepath << endl;
+            return 1;
+        }
+    }
+    if (!snarls_filepath.empty() && snarls_filepath != "-") {
+        if (!ifstream(snarls_filepath)) {
+            cerr << "error: could not open snarls file from " << snarls_filepath << endl;
+            return 1;
+        }
+    }
+
+    // load the graph
+    string graph_path = get_input_file_name(optind, argc, argv);
+    unique_ptr<MutablePathDeletableHandleGraph> graph;
+    unique_ptr<gbwtgraph::GBZ> gbz;
+    if (gbz_input) {
+        gbz = vg::io::VPKG::load_one<gbwtgraph::GBZ>(graph_path);;
+    }
+    else {
+        graph = vg::io::VPKG::load_one<MutablePathDeletableHandleGraph>(graph_path);
+    }
+
+    // load the BED
+    vector<tuple<string, size_t, size_t>> regions;
+    get_input_file(bed_filepath, [&](istream& in) {
+        regions = std::move(parse_bed(in));
+    });
+
+    // load the snarls
+    unique_ptr<SnarlManager> snarl_manager;
+    if (!snarls_filepath.empty()) {
+        snarl_manager = vg::io::VPKG::load_one<SnarlManager>(snarls_filepath);
+    }
+
+    Masker masker;
+    if (gbz.get()) {
+        masker = std::move(Masker(gbz->graph, snarl_manager.get()));
+    }
+    else {
+        masker = std::move(Masker(*graph, snarl_manager.get()));
+    }
+
+    masker.mask_sequences(regions);
+
+    // write the graph
+    if (gbz.get()) {
+        gbz->simple_sds_serialize(cout);
+    }
+    else {
+        vg::io::save_handle_graph(graph.get(), cout);
+    }
+
+    return 0;
+}
+
+
+// Register subcommand
+static Subcommand vg_mask("mask", "Mask out sequences in a graph with N's", main_mask);