From a7ef79a69c6af2593eea9f74b1ff64e39379f73f Mon Sep 17 00:00:00 2001
From: Zach Musgrave <zach@dolthub.com>
Date: Wed, 7 Jul 2021 15:33:08 -0700
Subject: [PATCH] Added a simple shell for exploring a noms dataset

---
 go/store/cmd/noms/splunk.pl | 103 ++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100755 go/store/cmd/noms/splunk.pl

diff --git a/go/store/cmd/noms/splunk.pl b/go/store/cmd/noms/splunk.pl
new file mode 100755
index 00000000000..1f2afacbe1b
--- /dev/null
+++ b/go/store/cmd/noms/splunk.pl
@@ -0,0 +1,103 @@
+#!/usr/bin/perl
+
+my $noms_dir = '.dolt/noms';
+
+if (! -d $noms_dir) {
+    die "Use splunk in a dolt directory";
+}
+
+if (! check_exists_command('noms')) {
+    die "noms binary not found on $PATH";
+}   
+
+print "Welcome to the splunk shell for exploring dolt repository storage.\n";
+
+my $manifest = `noms manifest $noms_dir`;
+my $root = get_root($manifest);
+
+my $message = "Currently examining root.\nUse numeric labels to navigate the tree\n.. to back up a level, / to return to root.\nType quit or exit to exit.\n";
+
+my $hash = $root;
+my @stack = ($root);
+
+while (true) {
+    my $labels = print_show($hash);
+
+    print $message if $message;
+    $message = "";
+    
+    print "> ";
+    my $input = <>;
+    chomp $input;
+    if ($input eq "quit" or $input eq "exit") {
+        print "Bye\n";
+        exit 0;
+    }
+
+    if ($input eq "..") {
+        if (scalar @stack <= 1) {
+            $message = "At top level, cannot go back\n";
+            next;
+        }
+
+        shift @stack;
+        $hash = $stack[0];
+        next;
+    }
+
+    if ($input eq "/") {
+        $hash = $root;
+        @stack = ($root);
+        next;
+    }
+
+    if (not defined $labels->{$input}) {
+        $message = "Invalid selection\nChoose a numeric label from the output above, or:\n.. to go back a level, / to go to the root\n";
+        next;
+    }
+
+    $hash = $labels->{$input};
+    unshift @stack, $hash;
+}
+
+sub show {
+    my $hash = shift;
+    my $cmd = "noms show $noms_dir\:\:#$hash";
+    return `$cmd`;
+}
+
+sub get_root {
+    my $manifest = shift;
+    for my $line (split /\n/, $manifest) {
+        next unless $line =~ /root/;
+        $line =~ /root:\s+([a-z0-9]{32})/;
+        return $1;
+    }
+
+    die "couldn't determine root in $manifest";
+}
+
+sub print_show {
+    my $hash = shift;
+
+    my %hashes;
+    my $label = 1;
+    
+    my $noms_show_output = show($hash);
+    for my $line (split /\n/, $noms_show_output) {
+        if ($line =~ /#([a-z0-9]{32})/) {
+            $hashes{$label} = $1;
+            print "$label)   $line\n";
+            $label++;
+        } else {
+            print "     $line\n";
+        }
+    }
+
+    return \%hashes;
+}
+
+sub check_exists_command { 
+    my $check = `sh -c 'command -v $_[0]'`; 
+    return $check;
+}