rename: add option --interactive to ask before overwriting

The option name -i/--interactive is picked from mv(1) and cp(1) from GNU
and BSD.

Also update the manpage.

1 files changed, 49 insertions, 9 deletions

diff --git a/misc-utils/rename.c b/misc-utils/rename.c
index 8f5d41a69..d98e9d8f9 100644
--- a/misc-utils/rename.c
+++ b/misc-utils/rename.c
@@ -27,6 +27,7 @@ for i in $@; do N=`echo "$i" | sed "s/$FROM/$TO/g"`; mv "$i" "$N"; done
 #include "xalloc.h"
 #include "c.h"
 #include "closestream.h"
+#include "rpmatch.h"
 
 #define RENAME_EXIT_SOMEOK	2
 #define RENAME_EXIT_NOTHING	4
@@ -54,7 +55,30 @@ static int string_replace(char *from, char *to, char *s, char *orig, char **newn
 	return 0;
 }
 
-static int do_symlink(char *from, char *to, char *s, int verbose, int noact, int nooverwrite)
+static int ask(char *name)
+{
+	int c;
+	char buf[2];
+	printf(_("%s: overwrite `%s'? "), program_invocation_short_name, name);
+	fflush(stdout);
+	if ((c = fgetc(stdin)) == EOF) {
+		buf[0] = '\0';
+		clearerr(stdin); errno = 0;
+		printf("\n");
+	}
+	else {
+		buf[0] = c; buf[1] = '\0';
+		if (c != '\n')
+			while ((c = fgetc(stdin)) != '\n' && c != EOF);
+	}
+	if (rpmatch(buf) == RPMATCH_YES)
+		return 0;
+	else
+		return 1;
+}
+
+static int do_symlink(char *from, char *to, char *s, int verbose, int noact,
+                      int nooverwrite, int interactive)
 {
 	char *newname = NULL, *target = NULL;
 	int ret = 1;
@@ -87,10 +111,14 @@ static int do_symlink(char *from, char *to, char *s, int verbose, int noact, int
 	if (string_replace(from, to, target, target, &newname))
 		ret = 0;
 
-	if (ret == 1 && nooverwrite && lstat(target, &sb) == 0) {
+	if (ret == 1 && (nooverwrite || interactive) && lstat(newname, &sb) != 0)
+		nooverwrite = interactive = 0;
+
+	if ( ret == 1 &&
+	     (nooverwrite || (interactive && (noact || ask(newname) != 0))) )
+	{
 		if (verbose)
 			printf(_("Skipping existing link: `%s' -> `%s'\n"), s, target);
-
 		ret = 0;
 	}
 
@@ -111,7 +139,8 @@ static int do_symlink(char *from, char *to, char *s, int verbose, int noact, int
 	return ret;
 }
 
-static int do_file(char *from, char *to, char *s, int verbose, int noact, int nooverwrite)
+static int do_file(char *from, char *to, char *s, int verbose, int noact,
+                   int nooverwrite, int interactive)
 {
 	char *newname = NULL, *file=NULL;
 	int ret = 1;
@@ -128,7 +157,10 @@ static int do_file(char *from, char *to, char *s, int verbose, int noact, int no
 	if (string_replace(from, to, file, s, &newname))
 		return 0;
 
-	if (nooverwrite && access(newname, F_OK) == 0) {
+	if ((nooverwrite || interactive) && access(newname, F_OK) != 0)
+		nooverwrite = interactive = 0;
+
+	if (nooverwrite || (interactive && (noact || ask(newname) != 0))) {
 		if (verbose)
 			printf(_("Skipping existing file: `%s'\n"), newname);
 		ret = 0;
@@ -159,6 +191,7 @@ static void __attribute__((__noreturn__)) usage(void)
 	fputs(_(" -s, --symlink       act on the target of symlinks\n"), out);
 	fputs(_(" -n, --no-act        do not make any changes\n"), out);
 	fputs(_(" -o, --no-overwrite  don't overwrite existing files\n"), out);
+	fputs(_(" -i, --interactive   prompt before overwrite\n"), out);
 	fputs(USAGE_SEPARATOR, out);
 	printf(USAGE_HELP_OPTIONS(21));
 	printf(USAGE_MAN_TAIL("rename(1)"));
@@ -168,8 +201,9 @@ static void __attribute__((__noreturn__)) usage(void)
 int main(int argc, char **argv)
 {
 	char *from, *to;
-	int i, c, ret = 0, verbose = 0, noact = 0, nooverwrite = 0;
-	int (*do_rename)(char *from, char *to, char *s, int verbose, int noact, int nooverwrite) = do_file;
+	int i, c, ret = 0, verbose = 0, noact = 0, nooverwrite = 0, interactive = 0;
+	int (*do_rename)(char *from, char *to, char *s, int verbose, int noact,
+	                 int nooverwrite, int interactive) = do_file;
 
 	static const struct option longopts[] = {
 		{"verbose", no_argument, NULL, 'v'},
@@ -177,6 +211,7 @@ int main(int argc, char **argv)
 		{"help", no_argument, NULL, 'h'},
 		{"no-act", no_argument, NULL, 'n'},
 		{"no-overwrite", no_argument, NULL, 'o'},
+		{"interactive", no_argument, NULL, 'i'},
 		{"symlink", no_argument, NULL, 's'},
 		{NULL, 0, NULL, 0}
 	};
@@ -186,7 +221,7 @@ int main(int argc, char **argv)
 	textdomain(PACKAGE);
 	atexit(close_stdout);
 
-	while ((c = getopt_long(argc, argv, "vsVhno", longopts, NULL)) != -1)
+	while ((c = getopt_long(argc, argv, "vsVhnoi", longopts, NULL)) != -1)
 		switch (c) {
 		case 'n':
 			noact = 1;
@@ -196,6 +231,11 @@ int main(int argc, char **argv)
 			break;
 		case 'o':
 			nooverwrite = 1;
+			interactive = 0;
+			break;
+		case 'i':
+			interactive = 1;
+			nooverwrite = 0;
 			break;
 		case 's':
 			do_rename = do_symlink;
@@ -224,7 +264,7 @@ int main(int argc, char **argv)
 		return RENAME_EXIT_NOTHING;
 
 	for (i = 2; i < argc; i++)
-		ret |= do_rename(from, to, argv[i], verbose, noact, nooverwrite);
+		ret |= do_rename(from, to, argv[i], verbose, noact, nooverwrite, interactive);
 
 	switch (ret) {
 	case 0: