Fix zsh completion arguments (fixes #473)

ChangeLog

@@ -1,3 +1,8 @@
+2021-01-03  Jay Berkenbilt  <ejb@ql.org>
+
+	* Don't include -o nospace with zsh completion setup so file
+	completion works normally. Fixes #473.
+
 2021-01-02  Jay Berkenbilt  <ejb@ql.org>
 
 	* Make QPDFPageObjectHelper methods pipeContents, parseContents,

TODO

@@ -1,11 +1,6 @@
 Candidates for upcoming release
 ===============================
 
-* Open "next" issues
-  * bugs
-    * #473: zsh completion with directories
-      * Investigate how serverless does completion
-
 * Remember to check work `qpdf` project for private issues
   * file with very slow page extraction
   * big page even with --remove-unreferenced-resources=yes, even with --empty

manual/qpdf-manual.xml

@@ -5021,6 +5021,12 @@ print "\n";
           was broken for pages with multiple content streams.
          </para>
         </listitem>
+        <listitem>
+         <para>
+          Tweak zsh completion code to behave a little better with
+          respect to path completion.
+         </para>
+        </listitem>
        </itemizedlist>
       </listitem>
      </itemizedlist>

qpdf/qpdf.cc

@@ -726,6 +726,8 @@ class ArgParser
     OptionEntry oe_optionalParameter(param_arg_handler_t);
     OptionEntry oe_requiredChoices(param_arg_handler_t, char const** choices);
 
+    void completionCommon(bool zsh);
+
     void argHelp();
     void argVersion();
     void argCopyright();
@@ -1637,7 +1639,7 @@ ArgParser::argHelp()
 }
 
 void
-ArgParser::argCompletionBash()
+ArgParser::completionCommon(bool zsh)
 {
     std::string progname = argv[0];
     std::string executable;
@@ -1657,8 +1659,16 @@ ArgParser::argCompletionBash()
             progname = appimage;
         }
     }
-    std::cout << "complete -o bashdefault -o default -o nospace"
-              << " -C " << progname << " " << whoami << std::endl;
+    if (zsh)
+    {
+        std::cout << "autoload -U +X bashcompinit && bashcompinit && ";
+    }
+    std::cout << "complete -o bashdefault -o default";
+    if (! zsh)
+    {
+        std::cout << " -o nospace";
+    }
+    std::cout << " -C " << progname << " " << whoami << std::endl;
     // Put output before error so calling from zsh works properly
     std::string path = progname;
     size_t slash = path.find('/');
@@ -1669,11 +1679,16 @@ ArgParser::argCompletionBash()
     }
 }
 
+void
+ArgParser::argCompletionBash()
+{
+    completionCommon(false);
+}
+
 void
 ArgParser::argCompletionZsh()
 {
-    std::cout << "autoload -U +X bashcompinit && bashcompinit && ";
-    argCompletionBash();
+    completionCommon(true);
 }
 void
 ArgParser::argJsonHelp()
@@ -3373,10 +3388,20 @@ ArgParser::addOptionsToCompletions()
          iter != this->option_table->end(); ++iter)
     {
         std::string const& arg = (*iter).first;
+        if (arg == "--")
+        {
+            continue;
+        }
         OptionEntry& oe = (*iter).second;
         std::string base = "--" + arg;
         if (oe.param_arg_handler)
         {
+            if (zsh_completion)
+            {
+                // zsh doesn't treat = as a word separator, so add all
+                // the options so we don't get a space after the =.
+                addChoicesToCompletions(arg, base + "=");
+            }
             completions.insert(base + "=");
         }
         if (! oe.parameter_needed)

qpdf/qtest/qpdf/completion-decode-l-zsh.out

@@ -0,0 +1,2 @@
+--decode-level=all
+!--help

qpdf/qtest/qpdf/completion-encrypt-40-zsh.out

@@ -0,0 +1,4 @@
+--annotate=n
+!----
+!--force-R5
+!--force-V4

qpdf/qtest/qpdf/completion-encrypt-40.out

@@ -1,3 +1,4 @@
 --annotate=
+!----
 !--force-R5
 !--force-V4

qpdf/qtest/qpdf/completion-later-arg-zsh.out

@@ -0,0 +1,7 @@
+--check
+--decode-level=all
+--encrypt
+!--completion-bash
+!--copyright
+!--help
+!--version

qpdf/qtest/qpdf/completion-top-arg-zsh.out

@@ -0,0 +1,7 @@
+--check
+--completion-bash
+--copyright
+--decode-level=none
+--encrypt
+--help
+--version