allow no subdirectories and update usage

Author: joshuaboud

README.md

@@ -9,11 +9,11 @@ Biasing the distribution this way ensures that each directory has a similar numb
 * Download Binary
   - curl
   ```sh
-  sudo curl https://github.com/joshuaboud/gen-dataset/releases/download/v1.1/gen-dataset -o /usr/local/bin/gen-dataset
+  sudo curl https://github.com/joshuaboud/gen-dataset/releases/download/v1.2/gen-dataset -o /usr/local/bin/gen-dataset
   ```
   - wget
   ```sh
-  sudo wget https://github.com/joshuaboud/gen-dataset/releases/download/v1.1/gen-dataset -P /usr/local/bin
+  sudo wget https://github.com/joshuaboud/gen-dataset/releases/download/v1.2/gen-dataset -P /usr/local/bin
   ```
 * Mark Executable
   ```sh
@@ -32,18 +32,22 @@ Biasing the distribution this way ensures that each directory has a similar numb
 ### Usage
 ```
 usage:
-  gen-dataset -d -b -c [-s -w -t] [path]
+  gen-dataset  -c [-b -d -s -t -w -y] [path]
 
 flags:
-  -d, --depth <int>                 - number of directory levels
   -b, --branches <int>              - number of subdirectories per directory
   -c, --count <int>                 - total number of files to create
+  -d, --depth <int>                 - number of directory levels
   -s, --size <float [K..T][i]B>     - file size
-  -w, --max-wait <float (seconds)>  - max random wait between file creation
   -t, --threads <int>               - number of parallel file creation threads
+  -w, --max-wait <float (seconds)>  - max random wait between file creation
   -y, --yes                         - don't prompt before creating files
 ```
 #### Example
+Generate 10 1GiB files in a single subdirectory named 'subdir':
+```sh
+gen-dataset -c 10 -s 1GiB subdir
+```
 Generate 10,000 1M files in 3905 directories:
 ```sh
 gen-dataset -d 5 -b 5 -c 10000 -s 1MiB

src/impl/getopts.cpp

@@ -32,15 +32,15 @@ static void usage(void){
 	std::cout << 
 	"gen-dataset Copyright (C) 2021 Josh Boudreau <jboudreau@45drives.com>\n"
 	"usage:\n"
-	"  gen-dataset -d -b -c [-s -w -t] [path]\n"
+	"  gen-dataset -c [-b -d -s -t -w -y] [path]\n"
 	"\n"
 	"flags:\n"
-	"  -d, --depth <int>                 - number of directory levels\n"
 	"  -b, --branches <int>              - number of subdirectories per directory\n"
 	"  -c, --count <int>                 - total number of files to create\n"
+	"  -d, --depth <int>                 - number of directory levels\n"
 	"  -s, --size <float [K..T][i]B>     - file size\n"
-	"  -w, --max-wait <float (seconds)>  - max random wait between file creation\n"
 	"  -t, --threads <int>               - number of parallel file creation threads\n"
+	"  -w, --max-wait <float (seconds)>  - max random wait between file creation\n"
 	"  -y, --yes                         - don't prompt before creating files\n"
 	<< std::endl;
 }
@@ -90,11 +90,11 @@ static int parse_size(const std::string &arg){
 
 static void check_opts(const Options &opts){
 	bool errors = false;
-	if(opts.depth < 1){
+	if(opts.depth < 0){
 		std::cerr << "Invalid depth: " << opts.depth << std::endl;
 		errors = true;
 	}
-	if(opts.branches < 1){
+	if(opts.branches < 0){
 		std::cerr << "Invalid branches: " << opts.branches << std::endl;
 		errors = true;
 	}

src/incl/getopts.hpp

@@ -20,8 +20,8 @@
 #pragma once
 
 struct Options{
-	int depth = -1;
-	int branches = -1;
+	int depth = 0;
+	int branches = 0;
 	long int count = -1;
 	int size = 0;
 	int max_wait_ms = 0;