Add psql expanded auto mode

This adds the "auto" option to the \x command, which switches to the
expanded mode when the normal output would be wider than the screen.

reviewed by Noah Misch

diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index d6941e0bd338782a5dbde564cd795858b7cadb8d..01f57c4eeb9febf6bfe8c9b82adf26fd711b35e6 100644 (file)
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1860,7 +1860,8 @@ lo_import 152801
           <para>
           Sets the target width for the <literal>wrapped</> format, and also
           the width limit for determining whether output is wide enough to
-          require the pager.
+          require the pager or switch to the vertical display in expanded auto
+          mode.
           Zero (the default) causes the target width to be controlled by the
           environment variable <envar>COLUMNS</>, or the detected screen width
           if <envar>COLUMNS</> is not set.
@@ -1876,15 +1877,19 @@ lo_import 152801
           <term><literal>expanded</literal> (or <literal>x</literal>)</term>
           <listitem>
           <para>
-          If <replaceable class="parameter">value</replaceable> is specified
-          it must be either <literal>on</literal> or <literal>off</literal>
-          which will enable or disable expanded mode.  If <replaceable
-          class="parameter">value</replaceable> is omitted the command toggles
-          between regular and expanded mode.
-          When expanded mode is enabled, query results
-          are displayed in two columns, with the column name on the left and
-          the data on the right. This mode is useful if the data wouldn't fit
-          on the screen in the normal <quote>horizontal</quote> mode.
+          If <replaceable class="parameter">value</replaceable> is specified it
+          must be either <literal>on</literal> or <literal>off</literal>, which
+          will enable or disable expanded mode, or <literal>auto</literal>.
+          If <replaceable class="parameter">value</replaceable> is omitted the
+          command toggles between the on and off settings.  When expanded mode
+          is enabled, query results are displayed in two columns, with the
+          column name on the left and the data on the right. This mode is
+          useful if the data wouldn't fit on the screen in the
+          normal <quote>horizontal</quote> mode.  In the auto setting, the
+          expanded mode is used whenever the query output is wider than the
+          screen, otherwise the regular mode is used.  The auto setting is only
+          effective in the aligned and wrapped formats.  In other formats, it
+          always behaves as if the expanded mode is off.
           </para>
           </listitem>
           </varlistentry>
@@ -2326,10 +2331,10 @@ lo_import 152801
 
 
       <varlistentry>
-        <term><literal>\x</literal></term>
+        <term><literal>\x [ <replaceable class="parameter">on</replaceable> | <replaceable class="parameter">off</replaceable> | <replaceable class="parameter">auto</replaceable> ]</literal></term>
         <listitem>
         <para>
-        Toggles expanded table formatting mode. As such it is equivalent to
+        Sets or toggles expanded table formatting mode. As such it is equivalent to
         <literal>\pset expanded</literal>.
        </para>
        </listitem>
@@ -3197,7 +3202,8 @@ $endif
      <para>
       If <literal>\pset columns</> is zero, controls the
       width for the <literal>wrapped</> format and width for determining
-      if wide output requires the pager.
+      if wide output requires the pager or should be switched to the
+      vertical format in expanded auto mode.
      </para>
     </listitem>
    </varlistentry>

diff --git a/src/bin/psql/command.c b/src/bin/psql/command.c
index 5970ab32c15b34cbc35e4929c0fc0669f1fa028d..9cc73beabff615430393456d093c8880e322d4fb 100644 (file)
--- a/src/bin/psql/command.c
+++ b/src/bin/psql/command.c
@@ -1355,7 +1355,7 @@ exec_command(const char *cmd,
        free(fname);
    }
 
-   /* \x -- toggle expanded table representation */
+   /* \x -- set or toggle expanded table representation */
    else if (strcmp(cmd, "x") == 0)
    {
        char       *opt = psql_scan_slash_option(scan_state,
@@ -2189,14 +2189,21 @@ do_pset(const char *param, const char *value, printQueryOpt *popt, bool quiet)
    /* set expanded/vertical mode */
    else if (strcmp(param, "x") == 0 || strcmp(param, "expanded") == 0 || strcmp(param, "vertical") == 0)
    {
-       if (value)
+       if (value && pg_strcasecmp(value, "auto") == 0)
+           popt->topt.expanded = 2;
+       else if (value)
            popt->topt.expanded = ParseVariableBool(value);
        else
            popt->topt.expanded = !popt->topt.expanded;
        if (!quiet)
-           printf(popt->topt.expanded
-                  ? _("Expanded display is on.\n")
-                  : _("Expanded display is off.\n"));
+       {
+           if (popt->topt.expanded == 1)
+               printf(_("Expanded display is on.\n"));
+           else if (popt->topt.expanded == 2)
+               printf(_("Expanded display is used automatically.\n"));
+           else
+               printf(_("Expanded display is off.\n"));
+       }
    }
 
    /* locale-aware numeric output */
@@ -2356,7 +2363,7 @@ do_pset(const char *param, const char *value, printQueryOpt *popt, bool quiet)
            popt->topt.columns = atoi(value);
 
        if (!quiet)
-           printf(_("Target width for \"wrapped\" format is %d.\n"), popt->topt.columns);
+           printf(_("Target width is %d.\n"), popt->topt.columns);
    }
 
    else

diff --git a/src/bin/psql/help.c b/src/bin/psql/help.c
index 53e4cd0c0e22552245f3fc2f9c1e06ee0fc6a317..4649e944755a5edd5b53f3a8143e4d7656b3a345 100644 (file)
--- a/src/bin/psql/help.c
+++ b/src/bin/psql/help.c
@@ -242,8 +242,8 @@ slashUsage(unsigned short int pager)
    fprintf(output, _("  \\t [on|off]            show only rows (currently %s)\n"),
            ON(pset.popt.topt.tuples_only));
    fprintf(output, _("  \\T [STRING]            set HTML <table> tag attributes, or unset if none\n"));
-   fprintf(output, _("  \\x [on|off]            toggle expanded output (currently %s)\n"),
-           ON(pset.popt.topt.expanded));
+   fprintf(output, _("  \\x [on|off|auto]       toggle expanded output (currently %s)\n"),
+           pset.popt.topt.expanded == 2 ? "auto" : ON(pset.popt.topt.expanded));
    fprintf(output, "\n");
 
    fprintf(output, _("Connection\n"));

diff --git a/src/bin/psql/print.c b/src/bin/psql/print.c
index 0d18665566f4f50c3a5aee2c3ba3bf4736de8a60..b19159d543b8b5ea100051266aa0e98ba2a2b890 100644 (file)
--- a/src/bin/psql/print.c
+++ b/src/bin/psql/print.c
@@ -122,9 +122,11 @@ const printTextFormat pg_utf8format =
 
 /* Local functions */
 static int strlen_max_width(unsigned char *str, int *target_width, int encoding);
-static void IsPagerNeeded(const printTableContent *cont, const int extra_lines,
+static void IsPagerNeeded(const printTableContent *cont, const int extra_lines, bool expanded,
              FILE **fout, bool *is_pager);
 
+static void print_aligned_vertical(const printTableContent *cont, FILE *fout);
+
 
 static void *
 pg_local_malloc(size_t size)
@@ -713,6 +715,17 @@ print_aligned_text(const printTableContent *cont, FILE *fout)
        }
    }
 
+   /*
+    * If in expanded auto mode, we have now calculated the expected width, so
+    * we can now escape to vertical mode if necessary.
+    */
+   if (cont->opt->expanded == 2 && output_columns > 0 &&
+       (output_columns < total_header_width || output_columns < width_total))
+   {
+       print_aligned_vertical(cont, fout);
+       return;
+   }
+
    /* If we wrapped beyond the display width, use the pager */
    if (!is_pager && fout == stdout && output_columns > 0 &&
        (output_columns < total_header_width || output_columns < width_total))
@@ -756,7 +769,7 @@ print_aligned_text(const printTableContent *cont, FILE *fout)
                extra_row_output_lines = 0;
            }
        }
-       IsPagerNeeded(cont, extra_output_lines, &fout, &is_pager);
+       IsPagerNeeded(cont, extra_output_lines, false, &fout, &is_pager);
    }
 
    /* time to output */
@@ -1125,6 +1138,7 @@ print_aligned_vertical(const printTableContent *cont, FILE *fout)
                dformatsize = 0;
    struct lineptr *hlineptr,
               *dlineptr;
+   bool        is_pager = false;
 
    if (cancel_pressed)
        return;
@@ -1139,6 +1153,13 @@ print_aligned_vertical(const printTableContent *cont, FILE *fout)
        return;
    }
 
+   /*
+    * Deal with the pager here instead of in printTable(), because we could
+    * get here via print_aligned_text() in expanded auto mode, and so we have
+    * to recalcuate the pager requirement based on vertical output.
+    */
+   IsPagerNeeded(cont, 0, true, &fout, &is_pager);
+
    /* Find the maximum dimensions for the headers */
    for (i = 0; i < cont->ncolumns; i++)
    {
@@ -1295,6 +1316,9 @@ print_aligned_vertical(const printTableContent *cont, FILE *fout)
    free(dlineptr->ptr);
    free(hlineptr);
    free(dlineptr);
+
+   if (is_pager)
+       ClosePager(fout);
 }
 
 
@@ -2265,14 +2289,14 @@ printTableCleanup(printTableContent *const content)
  * Setup pager if required
  */
 static void
-IsPagerNeeded(const printTableContent *cont, const int extra_lines, FILE **fout,
+IsPagerNeeded(const printTableContent *cont, const int extra_lines, bool expanded, FILE **fout,
              bool *is_pager)
 {
    if (*fout == stdout)
    {
        int         lines;
 
-       if (cont->opt->expanded)
+       if (expanded)
            lines = (cont->ncolumns + 1) * cont->nrows;
        else
            lines = cont->nrows + 1;
@@ -2310,11 +2334,10 @@ printTable(const printTableContent *cont, FILE *fout, FILE *flog)
    if (cont->opt->format == PRINT_NOTHING)
        return;
 
-   /* print_aligned_text() handles the pager itself */
-   if ((cont->opt->format != PRINT_ALIGNED &&
-        cont->opt->format != PRINT_WRAPPED) ||
-       cont->opt->expanded)
-       IsPagerNeeded(cont, 0, &fout, &is_pager);
+   /* print_aligned_*() handles the pager themselves */
+   if (cont->opt->format != PRINT_ALIGNED &&
+       cont->opt->format != PRINT_WRAPPED)
+       IsPagerNeeded(cont, 0, (cont->opt->expanded == 1), &fout, &is_pager);
 
    /* print the stuff */
 
@@ -2324,32 +2347,32 @@ printTable(const printTableContent *cont, FILE *fout, FILE *flog)
    switch (cont->opt->format)
    {
        case PRINT_UNALIGNED:
-           if (cont->opt->expanded)
+           if (cont->opt->expanded == 1)
                print_unaligned_vertical(cont, fout);
            else
                print_unaligned_text(cont, fout);
            break;
        case PRINT_ALIGNED:
        case PRINT_WRAPPED:
-           if (cont->opt->expanded)
+           if (cont->opt->expanded == 1)
                print_aligned_vertical(cont, fout);
            else
                print_aligned_text(cont, fout);
            break;
        case PRINT_HTML:
-           if (cont->opt->expanded)
+           if (cont->opt->expanded == 1)
                print_html_vertical(cont, fout);
            else
                print_html_text(cont, fout);
            break;
        case PRINT_LATEX:
-           if (cont->opt->expanded)
+           if (cont->opt->expanded == 1)
                print_latex_vertical(cont, fout);
            else
                print_latex_text(cont, fout);
            break;
        case PRINT_TROFF_MS:
-           if (cont->opt->expanded)
+           if (cont->opt->expanded == 1)
                print_troff_ms_vertical(cont, fout);
            else
                print_troff_ms_text(cont, fout);

diff --git a/src/bin/psql/print.h b/src/bin/psql/print.h
index 35bb4cde1d9be1ded49c99d9237bee4b6f1d4efa..bb206136294efe701703daae1c3933108b35ef9d 100644 (file)
--- a/src/bin/psql/print.h
+++ b/src/bin/psql/print.h
@@ -70,8 +70,8 @@ typedef struct printTextFormat
 typedef struct printTableOpt
 {
    enum printFormat format;    /* see enum above */
-   bool        expanded;       /* expanded/vertical output (if supported by
-                                * output format) */
+   unsigned short int expanded;/* expanded/vertical output (if supported by
+                                * output format); 0=no, 1=yes, 2=auto */
    unsigned short int border;  /* Print a border around the table. 0=none,
                                 * 1=dividing lines, 2=full */
    unsigned short int pager;   /* use pager for output (if to stdout and