Support comma-separated numeric values with --collate (fixes #505)

12 files changed, 1116 insertions, 39 deletions

diff --git a/ChangeLog b/ChangeLog
index a5bc330a..c5336c11 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,7 +1,11 @@
 2024-01-01  Jay Berkenbilt  <ejb@ql.org>
 
+	* Support comma-separated numeric values with --collate to select
+	different group sizes from different files. Fixes #505.
+
 	* Support "x" before a group in a numeric range to exclude a group
-	from the previous group. Details are in the manual.
+	from the previous group. Details are in the manual. Fixes #564,
+	#790.
 
 2023-12-29  Jay Berkenbilt  <ejb@ql.org>
 
diff --git a/include/qpdf/QPDFJob.hh b/include/qpdf/QPDFJob.hh
index d7f14957..3cfc550e 100644
--- a/include/qpdf/QPDFJob.hh
+++ b/include/qpdf/QPDFJob.hh
@@ -637,7 +637,7 @@ class QPDFJob
         bool show_filtered_stream_data{false};
         bool show_pages{false};
         bool show_page_images{false};
-        size_t collate{0};
+        std::vector<size_t> collate;
         bool flatten_rotation{false};
         bool list_attachments{false};
         std::string attachment_to_show;
diff --git a/job.sums b/job.sums
index adde95f6..bf044dcb 100644
--- a/job.sums
+++ b/job.sums
@@ -9,12 +9,12 @@ include/qpdf/auto_job_c_pages.hh b3cc0f21029f6d89efa043dcdbfa183cb59325b6506001c
 include/qpdf/auto_job_c_uo.hh ae21b69a1efa9333050f4833d465f6daff87e5b38e5106e49bbef5d4132e4ed1
 job.yml 4f89fc7b622df897d30d403d8035aa36fc7de8d8c43042c736e0300d904cb05c
 libqpdf/qpdf/auto_job_decl.hh 9c6f701c29f3f764d620186bed92685a2edf2e4d11e4f4532862c05470cfc4d2
-libqpdf/qpdf/auto_job_help.hh 838f4065f64dc3fbd493510fd21d8ab4e16ee2434592776f44f80cbe3045cb50
+libqpdf/qpdf/auto_job_help.hh ea0d0cdebeb190d305bd5f9bca85a4430dbcfa0881ac9be839216b878765b379
 libqpdf/qpdf/auto_job_init.hh b4c2b3724fba61f1206fd3bae81951636852592f67a63ef9539839c2c5995065
 libqpdf/qpdf/auto_job_json_decl.hh 06caa46eaf71db8a50c046f91866baa8087745a9474319fb7c86d92634cc8297
 libqpdf/qpdf/auto_job_json_init.hh f5acb9aa103131cb68dec0e12c4d237a6459bdb49b24773c24f0c2724a462b8f
 libqpdf/qpdf/auto_job_schema.hh b53c006fec2e75b1b73588d242d49a32f7d3db820b1541de106c5d4c27fbb4d9
 manual/_ext/qpdf.py 6add6321666031d55ed4aedf7c00e5662bba856dfcd66ccb526563bffefbb580
-manual/cli.rst d6d1ca82c936ffeaf137c586f988f80043db4c3b226d26fdf94f19a6005d012e
-manual/qpdf.1 10dc52d32a6d8885ce4e4292875ee7fe8e7a826ef3fc28db5671be413bcaacc7
+manual/cli.rst fc8488129c479b6cde9dffbbddb150bc1ffb45bc38b3bff2c5dba4378f0edb67
+manual/qpdf.1 738dc9b732ad4c880d034b99f957077628fde1d0006943aaf813e98f8e2f9635
 manual/qpdf.1.in 436ecc85d45c4c9e2dbd1725fb7f0177fb627179469f114561adf3cb6cbb677b
diff --git a/libqpdf/QPDFJob.cc b/libqpdf/QPDFJob.cc
index b2f905a1..a7cb3e3a 100644
--- a/libqpdf/QPDFJob.cc
+++ b/libqpdf/QPDFJob.cc
@@ -1,10 +1,6 @@
 #include <qpdf/QPDFJob.hh>
 
-#include <cctype>
-#include <cstdio>
-#include <cstdlib>
 #include <cstring>
-#include <fcntl.h>
 #include <iostream>
 #include <memory>
 
@@ -14,13 +10,11 @@
 #include <qpdf/Pl_DCT.hh>
 #include <qpdf/Pl_Discard.hh>
 #include <qpdf/Pl_Flate.hh>
-#include <qpdf/Pl_OStream.hh>
 #include <qpdf/Pl_StdioFile.hh>
 #include <qpdf/Pl_String.hh>
 #include <qpdf/QIntC.hh>
 #include <qpdf/QPDF.hh>
 #include <qpdf/QPDFAcroFormDocumentHelper.hh>
-#include <qpdf/QPDFArgParser.hh>
 #include <qpdf/QPDFCryptoProvider.hh>
 #include <qpdf/QPDFEmbeddedFileDocumentHelper.hh>
 #include <qpdf/QPDFExc.hh>
@@ -2419,26 +2413,32 @@ QPDFJob::handlePageSpecs(QPDF& pdf, std::vector<std::unique_ptr<QPDF>>& page_hea
         dh.removePage(page);
     }
 
-    if (m->collate && (parsed_specs.size() > 1)) {
+    auto n_collate = m->collate.size();
+    auto n_specs = parsed_specs.size();
+    if (n_collate > 0 && n_specs > 1) {
         // Collate the pages by selecting one page from each spec in order. When a spec runs out of
         // pages, stop selecting from it.
         std::vector<QPDFPageData> new_parsed_specs;
-        size_t nspecs = parsed_specs.size();
-        size_t cur_page = 0;
+        // Make sure we have a collate value for each spec. We have already checked that a non-empty
+        // collate has either one value or one value per spec.
+        for (auto i = n_collate; i < n_specs; ++i) {
+            m->collate.push_back(m->collate.at(0));
+        }
+        std::vector<size_t> cur_page(n_specs, 0);
         bool got_pages = true;
         while (got_pages) {
             got_pages = false;
-            for (size_t i = 0; i < nspecs; ++i) {
+            for (size_t i = 0; i < n_specs; ++i) {
                 QPDFPageData& page_data = parsed_specs.at(i);
-                for (size_t j = 0; j < m->collate; ++j) {
-                    if (cur_page + j < page_data.selected_pages.size()) {
+                for (size_t j = 0; j < m->collate.at(i); ++j) {
+                    if (cur_page.at(i) + j < page_data.selected_pages.size()) {
                         got_pages = true;
                         new_parsed_specs.emplace_back(
-                            page_data, page_data.selected_pages.at(cur_page + j));
+                            page_data, page_data.selected_pages.at(cur_page.at(i) + j));
                     }
                 }
+                cur_page.at(i) += m->collate.at(i);
             }
-            cur_page += m->collate;
         }
         parsed_specs = new_parsed_specs;
     }
@@ -3019,9 +3019,10 @@ QPDFJob::writeOutfile(QPDF& pdf)
             try {
                 QUtil::remove_file(backup.c_str());
             } catch (QPDFSystemError& e) {
-                *m->log->getError() << m->message_prefix << ": unable to delete original file ("
-                                    << e.what() << ");" << " original file left in " << backup
-                                    << ", but the input was successfully replaced\n";
+                *m->log->getError()
+                    << m->message_prefix << ": unable to delete original file (" << e.what() << ");"
+                    << " original file left in " << backup
+                    << ", but the input was successfully replaced\n";
             }
         }
     }
diff --git a/libqpdf/QPDFJob_config.cc b/libqpdf/QPDFJob_config.cc
index 4798ce9b..a0dc10f6 100644
--- a/libqpdf/QPDFJob_config.cc
+++ b/libqpdf/QPDFJob_config.cc
@@ -98,8 +98,27 @@ QPDFJob::Config::collate()
 QPDFJob::Config*
 QPDFJob::Config::collate(std::string const& parameter)
 {
-    auto n = (parameter.empty() ? 1 : QUtil::string_to_uint(parameter.c_str()));
-    o.m->collate = QIntC::to_size(n);
+    if (parameter.empty()) {
+        o.m->collate.push_back(1);
+        return this;
+    }
+    size_t pos = 0;
+    // Parse a,b,c
+    while (true) {
+        auto end = parameter.find(',', pos);
+        auto n = parameter.substr(pos, end);
+        if (n.empty()) {
+            usage("--collate: trailing comma");
+        }
+        o.m->collate.push_back(QIntC::to_size(QUtil::string_to_uint(n.c_str())));
+        if (end == std::string::npos) {
+            break;
+        }
+        pos = end + 1;
+    }
+    if (o.m->collate.empty()) {
+        o.m->collate.push_back(1);
+    }
     return this;
 }
 
@@ -932,9 +951,15 @@ QPDFJob::Config::pages()
 QPDFJob::Config*
 QPDFJob::PagesConfig::endPages()
 {
-    if (this->config->o.m->page_specs.empty()) {
+    auto n_specs = config->o.m->page_specs.size();
+    if (n_specs == 0) {
         usage("--pages: no page specifications given");
     }
+    auto n_collate = config->o.m->collate.size();
+    if (!(n_collate == 0 || n_collate == 1 || n_collate == n_specs)) {
+        usage("--pages: if --collate has more than one value, it must have one value per page "
+              "specification");
+    }
     return this->config;
 }
 
diff --git a/libqpdf/qpdf/auto_job_help.hh b/libqpdf/qpdf/auto_job_help.hh
index 4ee0f56e..c83f94b4 100644
--- a/libqpdf/qpdf/auto_job_help.hh
+++ b/libqpdf/qpdf/auto_job_help.hh
@@ -315,11 +315,13 @@ ap.addOptionHelp("--pages", "modification", "begin page selection", R"(--pages f
 
 Run qpdf --help=page-selection for details.
 )");
-ap.addOptionHelp("--collate", "modification", "collate with --pages", R"(--collate[=n]
+ap.addOptionHelp("--collate", "modification", "collate with --pages", R"(--collate[=n[,m,...]]
 
 Collate rather than concatenate pages specified with --pages.
 With a numeric parameter, collate in groups of n. The default
-is 1. Run qpdf --help=page-selection for additional details.
+is 1. With comma-separated numeric parameters, take n from the
+first file, m from the second, etc. Run
+qpdf --help=page-selection for additional details.
 )");
 ap.addOptionHelp("--split-pages", "modification", "write pages to separate files", R"(--split-pages[=n]
 
@@ -607,6 +609,8 @@ Run qpdf --help=page-ranges for help with page ranges.
 
 Use --collate=n to cause pages to be collated in groups of n pages
 (default 1) instead of concatenating the input.
+Use --collate=i,j,k,... to take i from the first, then j from the
+second, then k from the third, then i from the first, etc.
 
 Examples:
 
diff --git a/manual/cli.rst b/manual/cli.rst
index 592ba6ef..4927205a 100644
--- a/manual/cli.rst
+++ b/manual/cli.rst
@@ -1403,18 +1403,21 @@ Related Options
    See also :qpdf:ref:`--split-pages`, :qpdf:ref:`--collate`,
    :ref:`page-ranges`.
 
-.. qpdf:option:: --collate[=n]
+.. qpdf:option:: --collate[=n[,m,...]]
 
    .. help: collate with --pages
 
       Collate rather than concatenate pages specified with --pages.
       With a numeric parameter, collate in groups of n. The default
-      is 1. Run qpdf --help=page-selection for additional details.
+      is 1. With comma-separated numeric parameters, take n from the
+      first file, m from the second, etc. Run
+      qpdf --help=page-selection for additional details.
 
    This option causes :command:`qpdf` to collate rather than
    concatenate pages specified with :qpdf:ref:`--pages`. With a
    numeric parameter, collate in groups of :samp:`{n}`. The default
-   is 1.
+   is 1. With comma-separated numeric parameters, take :samp:`{n}`
+   from the first file, :samp:`{m}` from the second, etc.
 
    Please see :ref:`page-selection` for additional details.
 
@@ -2335,6 +2338,8 @@ Page Selection
 
    Use --collate=n to cause pages to be collated in groups of n pages
    (default 1) instead of concatenating the input.
+   Use --collate=i,j,k,... to take i from the first, then j from the
+   second, then k from the third, then i from the first, etc.
 
    Examples:
 
@@ -2383,9 +2388,13 @@ Notes:
 See :ref:`page-ranges` for help on specifying a page range.
 
 Use :samp:`--collate={n}` to cause pages to be collated in groups of
-:samp:`{n}` pages (default 1) instead of concatenating the input. Note
-that the :qpdf:ref:`--collate` appears outside of ``--pages ... --``
-(before ``--pages`` or after ``--``). Pages are pulled from each
+:samp:`{n}` pages (default 1) instead of concatenating the input. Use
+:samp:`--collate={i},{j},{k},...` to take :samp:`{i}` from the first,
+then :samp:`{j}` from the second, then :samp:`{k}` from the third,
+then :samp:`{i}` from the first, etc.
+
+Note that the :qpdf:ref:`--collate` appears outside of ``--pages ...
+--`` (before ``--pages`` or after ``--``). Pages are pulled from each
 document in turn. When a document is out of pages, it is skipped. See
 examples below.
 
@@ -2481,6 +2490,34 @@ Examples
 
   - a.pdf page 5
 
+- You can specify a multiple numeric parameters to :qpdf:ref:`--collate`. With
+  :samp:`--collate={i,j,k}`, pull groups of :samp:`{i}` pages from the
+  first file, then :samp:`{j}` from the second, thenm :samp:`{k}` from
+  the third, repeating. The number of parameters must equal the number
+  of groups. For example, if you ran
+
+  ::
+
+     qpdf --collate=2,1,3 --empty --pages a.pdf 1-5 b.pdf 6-4 c.pdf r1-r4 -- out.pdf
+
+  you would get the following pages in this order:
+
+  - a.pdf pages 1 and 2
+
+  - b.pdf page 6
+
+  - c.pdf last three pages in reverse order
+
+  - a.pdf pages 3 and 4
+
+  - b.pdf page 5
+
+  - c.pdf fourth to last page
+
+  - a.pdf page 5
+
+  - b.pdf page 4
+
 - Take pages 1 through 5 from :file:`file1.pdf` and pages 11 through
   15 in reverse from :file:`file2.pdf`, taking document-level metadata
   from :file:`file2.pdf`.
diff --git a/manual/qpdf.1 b/manual/qpdf.1
index d758dca3..bf5e9792 100644
--- a/manual/qpdf.1
+++ b/manual/qpdf.1
@@ -414,11 +414,13 @@ Related Options:
 Run qpdf --help=page-selection for details.
 .TP
 .B --collate \-\- collate with --pages
---collate[=n]
+--collate[=n[,m,...]]
 
 Collate rather than concatenate pages specified with --pages.
 With a numeric parameter, collate in groups of n. The default
-is 1. Run qpdf --help=page-selection for additional details.
+is 1. With comma-separated numeric parameters, take n from the
+first file, m from the second, etc. Run
+qpdf --help=page-selection for additional details.
 .TP
 .B --split-pages \-\- write pages to separate files
 --split-pages[=n]
@@ -737,6 +739,8 @@ Run qpdf --help=page-ranges for help with page ranges.
 
 Use --collate=n to cause pages to be collated in groups of n pages
 (default 1) instead of concatenating the input.
+Use --collate=i,j,k,... to take i from the first, then j from the
+second, then k from the third, then i from the first, etc.
 
 Examples:
 
diff --git a/manual/release-notes.rst b/manual/release-notes.rst
index 17dc116d..72b1aad6 100644
--- a/manual/release-notes.rst
+++ b/manual/release-notes.rst
@@ -50,6 +50,10 @@ Planned changes for future 12.x (subject to change):
       of pages within a page range. See :ref:`page-ranges` for
       details.
 
+    - Support comma-separated numeric values with
+      :qpdf:ref:`--collate` to select different numbers of pages from
+      different groups.
+
 11.7.0: December 24, 2023
   - Bug fixes:
 
diff --git a/qpdf/qtest/arg-parsing.test b/qpdf/qtest/arg-parsing.test
index aca8c7ef..82594674 100644
--- a/qpdf/qtest/arg-parsing.test
+++ b/qpdf/qtest/arg-parsing.test
@@ -15,7 +15,7 @@ cleanup();
 
 my $td = new TestDriver('arg-parsing');
 
-my $n_tests = 22;
+my $n_tests = 23;
 
 $td->runtest("required argument",
              {$td->COMMAND => "qpdf --password minimal.pdf"},
@@ -94,6 +94,14 @@ $td->runtest("v2-only qpdf json-key",
              {$td->REGEXP => ".*\"qpdf\" is only valid for json version > 1.*",
                   $td->EXIT_STATUS => 2},
              $td->NORMALIZE_NEWLINES);
+$td->runtest("wrong number of collate args",
+             {$td->COMMAND =>
+                  "qpdf --collate=2,3 collate-odd.pdf" .
+                  " --pages . minimal.pdf collate-even.pdf -- a.pdf"},
+             {$td->REGEXP => ".*--collate has more than one value.*",
+                  $td->EXIT_STATUS => 2},
+             $td->NORMALIZE_NEWLINES);
+
 # Ignoring -- at the top level was never intended but turned out to
 # have been there for a long time so that people relied on it. It is
 # intentionally not documented.
diff --git a/qpdf/qtest/collate.test b/qpdf/qtest/collate.test
index fbbea641..fb296e29 100644
--- a/qpdf/qtest/collate.test
+++ b/qpdf/qtest/collate.test
@@ -17,9 +17,11 @@ my $td = new TestDriver('collate');
 my @collate = (
     ["", "three-files", "collate-odd",
      "collate-odd.pdf 1-5 minimal.pdf collate-even.pdf 7-1"],
-    [1, "three-files", "collate-odd",
+    ["1", "three-files", "collate-odd",
      "collate-odd.pdf 1-5 minimal.pdf collate-even.pdf 7-1"],
-    [2, "three-files-2", "collate-odd",
+    ["2", "three-files-2", "collate-odd",
+     "collate-odd.pdf 1-5 minimal.pdf collate-even.pdf 7-1"],
+    ["2,3,4", "three-files-2,3,4", "collate-odd",
      "collate-odd.pdf 1-5 minimal.pdf collate-even.pdf 7-1"],
     );
 my $n_tests = 2 * scalar(@collate);
@@ -28,7 +30,7 @@ foreach my $d (@collate)
 {
     my ($n, $description, $first, $args) = @$d;
     my $collate = '--collate';
-    if ($n)
+    if ($n ne "")
     {
         $collate .= "=$n";
     }
diff --git a/qpdf/qtest/qpdf/three-files-2,3,4-collate-out.pdf b/qpdf/qtest/qpdf/three-files-2,3,4-collate-out.pdf
new file mode 100644
index 00000000..8be9c056
--- /dev/null
+++ b/qpdf/qtest/qpdf/three-files-2,3,4-collate-out.pdf
@@ -0,0 +1,988 @@
+%PDF-1.3
+%¿÷¢þ
+%QDF-1.0
+
+%% Original object ID: 1 0
+1 0 obj
+<<
+  /Outlines 2 0 R
+  /PageLabels <<
+    /Nums [
+      0
+      <<
+        /P ()
+        /St 1
+      >>
+      1
+      <<
+        /S /r
+        /St 1
+      >>
+      2
+      <<
+        /St 3
+      >>
+      3
+      <<
+        /S /D
+        /St 3
+      >>
+      4
+      <<
+        /P ()
+        /St 1
+      >>
+      5
+      <<
+        /S /r
+        /St 6
+      >>
+      6
+      <<
+        /P ()
+        /St 1
+      >>
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+      <<
+        /S /r
+        /St 3
+      >>
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+      <<
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+      >>
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+      >>
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+      <<
+        /S /r
+        /St 2
+      >>
+      11
+      <<
+        /P ()
+        /St 2
+      >>
+      12
+      <<
+        /P ()
+        /St 2
+      >>
+    ]
+  >>
+  /PageMode /UseOutlines
+  /Pages 3 0 R
+  /Type /Catalog
+>>
+endobj
+
+%% Original object ID: 2 0
+2 0 obj
+<<
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+  /First 4 0 R
+  /Last 5 0 R
+  /Type /Outlines
+>>
+endobj
+
+%% Original object ID: 3 0
+3 0 obj
+<<
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+    13 0 R
+    14 0 R
+    15 0 R
+    16 0 R
+    17 0 R
+    18 0 R
+  ]
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+>>
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+
+%% Original object ID: 4 0
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