feat: add -vv option to list features (#645)

Author: tueda

doc/form.1

@@ -96,6 +96,9 @@ the program.
 .BR "-v"
 Only the version will be printed. The program terminates immediately after it.
 .TP
+.BR "-vv"
+The same as \fB-v\fR, but additionally prints a list indicating which features are supported.
+.TP
 .BR "-w"
 This should be followed immediately by a number without any space. The number
 indicates the number of worker threads for \fBtform\fR. All other versions of

doc/manual/startup.tex

@@ -62,6 +62,8 @@ \chapter{Running FORM}
      information see the "On TotalSize;" statement~\ref{ontotalsize}.
 \item[-v] Only the version will be printed. The program terminates 
      immediately after it.
+\item[-vv] The same as -v, but additionally prints a list indicating
+     which features are supported.
 \item[-w] This should be followed immediately by a number. The 
      number indicates the number of worker threads for \TFORM\@. All other 
      versions of \FORM\ ignore this parameter. It should be noted that \TFORM\ 

sources/Makefile.am

@@ -15,6 +15,7 @@ SRCBASE = \
 	execute.c \
 	extcmd.c \
 	factor.c \
+	features.cc \
 	findpat.c \
 	form3.h \
 	fsizes.h \

sources/declare.h

@@ -671,6 +671,7 @@ extern int    Product(UWORD *,WORD *,WORD);
 extern void   PrtLong(UWORD *,WORD,UBYTE *);
 extern void   PrtTerms(void);
 extern void   PrintDeprecation(const char *,const char *);
+extern void   PrintFeatureList(void);
 extern void   PrintRunningTime(void);
 extern LONG   GetRunningTime(void);
 extern int    PutBracket(PHEAD WORD *);

sources/features.cc

@@ -0,0 +1,212 @@
+/** @file features.cc
+ *
+ *   Utility code for printing available features.
+ */
+/* #[ License : */
+/*
+ *   Copyright (C) 1984-2026 J.A.M. Vermaseren
+ *   When using this file you are requested to refer to the publication
+ *   J.A.M.Vermaseren "New features of FORM" math-ph/0010025
+ *   This is considered a matter of courtesy as the development was paid
+ *   for by FOM the Dutch physics granting agency and we would like to
+ *   be able to track its scientific use to convince FOM of its value
+ *   for the community.
+ *
+ *   This file is part of FORM.
+ *
+ *   FORM is free software: you can redistribute it and/or modify it under the
+ *   terms of the GNU General Public License as published by the Free Software
+ *   Foundation, either version 3 of the License, or (at your option) any later
+ *   version.
+ *
+ *   FORM is distributed in the hope that it will be useful, but WITHOUT ANY
+ *   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ *   FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ *   details.
+ *
+ *   You should have received a copy of the GNU General Public License along
+ *   with FORM.  If not, see <http://www.gnu.org/licenses/>.
+ */
+/* #] License : */
+//	#[ Includes :
+
+extern "C" {
+#include "form3.h"
+}
+
+#include <algorithm>
+#include <string>
+#include <vector>
+
+#ifdef WITHFLINT
+#include <flint/flint.h>
+#endif
+
+#ifdef WITHGMP
+#include <gmp.h>
+#endif
+
+#ifdef WITHMPFR
+#include <mpfr.h>
+#endif
+
+#ifdef WITHZLIB
+#include <zlib.h>
+#endif
+
+#ifdef WITHZSTD
+#include <zstd.h>
+#endif
+
+//	#] Includes : 
+//	#[ PrintFeatureList :
+
+/**
+ * Prints a list of strings in multiple columns to fit within the line length.
+ *
+ * @param lines  List of strings to print.
+ */
+static void PrintMulticolumn(const std::vector<std::string>& lines)
+{
+	const std::size_t n_lines = lines.size();
+
+	if ( n_lines == 0 ) return;
+
+	const std::size_t line_len = AC.LineLength > 0 ? AC.LineLength : 79;
+	constexpr std::size_t max_cols = 6;
+	constexpr std::size_t col_spacing = 2;
+
+	std::vector<std::size_t> col_lens(max_cols);
+
+	for ( std::size_t n_cols = max_cols; n_cols >= 2; n_cols-- ) {
+		const std::size_t n_rows = (n_lines - 1) / n_cols + 1;
+
+		// Check whether `n_cols` columns fit within the line length.
+		// Columns are filled top-to-bottom, then left-to-right.
+
+		std::fill(col_lens.begin(),col_lens.begin()+n_cols,0);
+
+		std::size_t total_len = 0;
+		for ( std::size_t  j = 0; j < n_cols; j++ ) {
+			for ( std::size_t i = 0; i < n_rows; i++ ) {
+				const std::size_t k = i + j * n_rows;
+				if ( k >= n_lines ) break;
+				col_lens[j] = std::max(col_lens[j],lines[k].size());
+			}
+			total_len += col_lens[j];
+		}
+		total_len += (n_cols - 1) * col_spacing;
+
+		if ( total_len > line_len ) continue;
+
+		// Output using `n_cols` columns.
+
+		std::string line;
+		line.reserve(line_len);
+		for ( std::size_t i = 0; i < n_rows; i++ ) {
+			line.clear();
+			for ( std::size_t j = 0; j < n_cols; j++ ) {
+				const std::size_t k = i + j * n_rows;
+				if ( k >= n_lines ) break;
+				line += lines[k];
+				if ( j < n_cols - 1 ) {
+					line += std::string(col_lens[j]-lines[k].size()+col_spacing,' ');
+				}
+			}
+			MesPrint("%s",line.c_str());
+		}
+		return;
+	}
+
+	// Fallback to a single column.
+
+	for ( const auto& f : lines ) {
+		MesPrint("%s",f.c_str());
+	}
+}
+
+/**
+ * Prints the list of available features.
+ */
+void PrintFeatureList(void)
+{
+	std::vector<std::string> feature_list = {
+
+#ifdef ENABLE_BACKTRACE
+		"+backtrace",
+#else
+		"-backtrace",
+#endif
+
+#ifdef DEBUGGING
+		"+debugging",
+#else
+		"-debugging",
+#endif
+
+#ifdef WITHFLINT
+		"+flint=" + std::string(flint_version),
+#else
+		"-flint",
+#endif
+
+#ifdef WITHFLOAT
+		"+float",
+#else
+		"-float",
+#endif
+
+#ifdef WITHGMP
+		"+gmp=" + std::string(gmp_version),
+#else
+		"-gmp",
+#endif
+
+#ifdef WITHMPFR
+		"+mpfr=" + std::string(mpfr_get_version()),
+#else
+		"-mpfr",
+#endif
+
+#ifdef WITHMPI
+		"+mpi",
+#else
+		"-mpi",
+#endif
+
+#ifdef UNIX
+		"+posix",
+#else
+		"-posix",
+#endif
+
+#ifdef WITHPTHREADS
+		"+pthreads",
+#else
+		"-pthreads",
+#endif
+
+#ifdef WINDOWS
+		"+windows",
+#else
+		"-windows",
+#endif
+
+#ifdef WITHZLIB
+		"+zlib=" + std::string(zlibVersion()),
+#else
+		"-zlib",
+#endif
+
+#ifdef WITHZSTD
+		"+zstd=" + std::string(ZSTD_versionString()),
+#else
+		"-zstd",
+#endif
+
+	};
+
+	PrintMulticolumn(feature_list);
+}
+
+//	#] PrintFeatureList : 

sources/startup.c

@@ -109,9 +109,12 @@
 /**
  * Prints the header line of the output.
  *
- * @param  with_full_info  True for printing also runtime information.
+ * @param  par  Controls the output mode
+ *              (0: default,
+ *               1: including runtime information,
+ *               2: including the feature list).
  */
-static void PrintHeader(int with_full_info)
+static void PrintHeader(int par)
 {
 #ifdef WITHMPI
 	if ( PF.me == MASTER && !AM.silent ) {
@@ -147,7 +150,7 @@ static void PrintHeader(int with_full_info)
 		s += snprintf(s,250-(s-buffer1)," %d-bits",(WORD)(sizeof(WORD)*16));
 		*s = 0;
 */
-		if ( with_full_info ) {
+		if ( par == 1 ) {
 #if defined(WITHPTHREADS) || defined(WITHMPI)
 #if defined(WITHPTHREADS)
 			int nworkers = AM.totalnumberofthreads-1;
@@ -200,6 +203,10 @@ static void PrintHeader(int with_full_info)
 			MesPrint("%s",buffer1);
 			AC.LineLength = oldLineLength;
 		}
+
+		if ( par == 2 ) {
+			PrintFeatureList();
+		}
 	}
 #ifdef WINDOWS
 	PrintDeprecation("the native Windows version", "issues/623");
@@ -414,12 +421,13 @@ int DoTail(int argc, UBYTE **argv)
 							break;
 				case 'T': /* Print the total size used at end of job */
 							AM.PrintTotalSize = 1; break;
-				case 'v':
+				case 'v': /* Print version information */
+							if ( s[1] == 'v' ) {
+								PrintHeader(2);
+								return(1);
+							}
 printversion:;
-#ifdef WITHMPI
-							if ( PF.me == MASTER )
-#endif
-								PrintHeader(0);
+							PrintHeader(0);
 							if ( onlyversion ) return(1);
 							goto NoFile;
 				case 'y': /* Preprocessor dumps output. No compilation. */