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Add help option

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This commit is contained in:
Dave Vasilevsky 2012-10-13 08:20:23 -04:00
parent 034805e2a6
commit 570b026d0a
1 changed files with 42 additions and 6 deletions
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48
pixz.c
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@ -13,6 +13,40 @@ static bool strsuf(char *big, char *small);
static char *subsuf(char *in, char *suf1, char *suf2);
static char *auto_output(pixz_op_t op, char *in);
static void usage(const char *msg) {
if (msg)
fprintf(stderr, "%s\n\n", msg);
fprintf(stderr,
"pixz: Parallel Indexing XZ compression, fully compatible with XZ\n"
"\n"
"Basic usage:\n"
" pixz input output.pxz # Compress a file in parallel\n"
" pixz -d input.pxz output # Decompress\n"
"\n"
"Tarballs:\n"
" pixz input.tar output.tpxz # Compress and index a tarball\n"
" pixz -d input.tpxz output.tar # Decompress\n"
" pixz -l input.tpxz # List tarball contents very fast\n"
" pixz -x path/to/file < input.tpxz | tar x # Extract one file very fast\n"
" tar -Ipixz -cf output.tpxz dir # Make tar use pixz automatically\n"
"\n"
"Input and output:\n"
" pixz < input > output.pxz # Same as `pixz input output.pxz`\n"
" pixz -i input -o output.pxz # Ditto\n"
" pixz [-d] input # Automatically choose output filename\n"
"\n"
"Other flags:\n"
" -0, -1 ... -9 Set compression level, from fastest to strongest\n"
" -t Don't assume input is in tar format\n"
" -h Print this help\n"
"\n"
"(C) 2009-2012 Dave Vasilevsky <dave@vasilevsky.ca>\n"
"https://github.com/vasi/pixz\n"
"You may use this software under the FreeBSD License\n"
);
exit(2);
}
int main(int argc, char **argv) {
uint32_t level = LZMA_PRESET_DEFAULT;
@ -21,7 +55,7 @@ int main(int argc, char **argv) {
char *ipath = NULL, *opath = NULL;
int ch;
while ((ch = getopt(argc, argv, "dxli:o:tv0123456789")) != -1) {
while ((ch = getopt(argc, argv, "dxli:o:tvh0123456789")) != -1) {
switch (ch) {
case 'd': op = OP_READ; break;
case 'x': op = OP_EXTRACT; break;
@ -29,11 +63,12 @@ int main(int argc, char **argv) {
case 'i': ipath = optarg; break;
case 'o': opath = optarg; break;
case 't': tar = false; break;
case 'h': usage(NULL);
default:
if (ch >= '0' && ch <= '9') {
level = ch - '0';
} else {
die("Unknown option");
usage("");
}
}
}
@ -45,18 +80,20 @@ int main(int argc, char **argv) {
bool iremove = false;
if (op != OP_EXTRACT && argc >= 1) {
if (argc > 2 || (op == OP_LIST && argc == 2))
die("Too many arguments");
usage("Too many arguments");
if (ipath)
die("Multiple input files specified");
usage("Multiple input files specified");
ipath = argv[0];
if (argc == 2) {
if (opath)
die("Multiple output files specified");
usage("Multiple output files specified");
opath = argv[1];
} else if (op != OP_LIST) {
iremove = true;
opath = auto_output(op, argv[0]);
if (!opath)
usage("Unknown suffix");
}
}
@ -92,7 +129,6 @@ static char *auto_output(pixz_op_t op, char *in) {
SUF(READ, ".xz", "");
SUF(WRITE, ".tar", ".tpxz");
SUF(WRITE, "", ".xz");
die("Unknown suffix");
return NULL;
}