From b1122ce4f579824cd5182f5bdd1f5c780c652d3b Mon Sep 17 00:00:00 2001
From: Francois Fleuret <francois@fleuret.org>
Date: Mon, 8 Mar 2010 08:17:18 +0100
Subject: [PATCH] Changed the syntax for negation from ^ to not:

---
 finddup.1 | 15 +++++----------
 finddup.c |  8 ++++----
 2 files changed, 9 insertions(+), 14 deletions(-)

diff --git a/finddup.1 b/finddup.1
index 3ae9a42..d0c0eba 100644
--- a/finddup.1
+++ b/finddup.1
@@ -10,19 +10,14 @@ finddup \- Find files common to two directories (or not)
 
 .SH "SYNOPSIS"
 
-\fBfinddup\fP [OPTION]... DIR1 [[^]DIR2]
+\fBfinddup\fP [OPTION]... DIR1 [[not:]DIR2]
 
 .SH "DESCRIPTION"
 
-\fBfinddup\fP is a command line utility to find duplicate files, files
-common to two directories or files existing in one directory and not
-in another one.
-
-With a single directory argument, prints the duplicate files found in
-it. With two directories, prints the files common to both.
-
-If the second directory name starts with a ^, prints the files
-existing in DIR1 which do not exist in DIR2.
+With a single directory argument, \fBfinddup\fP prints the duplicate
+files found in it. With two directories, it prints either the files
+common to both DIR1 and DIR2, or with the not: prefix, the ones
+present in DIR1 and not in DIR2.
 
 .SH "OPTIONS"
 .TP
diff --git a/finddup.c b/finddup.c
index 9a6e6be..91079de 100644
--- a/finddup.c
+++ b/finddup.c
@@ -221,9 +221,9 @@ void start(const char *dirname1, const char *dirname2) {
   struct file_with_size *node1, *node2;
   int not_in, found;
 
-  if(dirname2[0] == '^') {
+  if(strncmp(dirname2, "not:", 4) == 0) {
     not_in = 1;
-    dirname2++;
+    dirname2 += 4;
   } else {
     not_in = 0;
   }
@@ -272,9 +272,9 @@ void start(const char *dirname1, const char *dirname2) {
 }
 
 void print_help(FILE *out) {
-  fprintf(out, "Usage: finddup [OPTION]... DIR1 [[^]DIR2]\n");
+  fprintf(out, "Usage: finddup [OPTION]... DIR1 [[not:]DIR2]\n");
   fprintf(out, "Version %s (%s)\n", VERSION_NUMBER, UNAME);
-  fprintf(out, "Without DIR2, lists duplicated files in DIR1. With DIR2, list files common to both directories. With DIR2 starting with a ^, list files found in DIR1 which do not exist in DIR2.\n");
+  fprintf(out, "Without DIR2, lists duplicate files found in DIR1. With DIR2, lists files common to both directories. With the not: prefix, lists files found in DIR1 which do not exist in DIR2.\n");
   fprintf(out, "\n");
   fprintf(out, "   -h   show this help.\n");
   fprintf(out, "   -r   show the real file paths.\n");
-- 
2.20.1