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sortix--sortix/utils/column.cpp
2012-12-14 14:18:38 +01:00

186 lines
4.2 KiB
C++

/*******************************************************************************
COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2012.
This program 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.
This program 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
this program. If not, see <http://www.gnu.org/licenses/>.
cat.cpp
Columnate lists.
*******************************************************************************/
#define _SORTIX_SOURCE
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <error.h>
#include <string.h>
#include <termios.h>
int termwidth = 80;
size_t linesused = 0;
size_t lineslength = 0;
char** lines = 0;
size_t longestline = 0;
size_t measurelength(const char* line)
{
size_t len = 0;
bool escaped = false;
while ( char c = *line++ )
{
if ( escaped )
{
if ( isalpha(c) )
escaped = false;
continue;
}
if ( c == '\e' )
{
escaped = true;
continue;
}
len++;
}
return len;
}
bool processline(char* line)
{
if ( linesused == lineslength )
{
size_t newlineslength = lineslength ? 2 * lineslength : 32;
char** newlines = new char*[newlineslength];
memcpy(newlines, lines, sizeof(char*) * linesused);
delete[] lines;
lines = newlines;
lineslength = newlineslength;
}
lines[linesused++] = line;
size_t linelen = measurelength(line);
if ( longestline < linelen ) { longestline = linelen; }
return true;
}
bool processfp(const char* inputname, FILE* fp)
{
if ( strcmp(inputname, "-") == 0 ) { inputname = "<stdin>"; }
while ( true )
{
size_t linesize;
char* line = NULL;
ssize_t linelen = getline(&line, &linesize, fp);
if ( linelen < 0 )
{
if ( feof(fp) ) { return true; }
error(0, errno, "error reading: %s (%i)", inputname, fileno(fp));
return false;
}
line[--linelen] = 0;
if ( !processline(line) ) { exit(1); }
}
}
bool doformat()
{
size_t width = termwidth;
size_t columnwidth = longestline + 2;
size_t columns = width / columnwidth;
if ( !columns ) { columns = 1; }
bool newline = false;
for ( size_t i = 0; i < linesused; i++ )
{
newline = false;
size_t column = i % columns;
size_t offset = column * columnwidth;
printf("\e[%zuG%s", offset+1, lines[i]);
if ( columns <= column + 1 ) { printf("\n"); newline = true; }
}
if ( linesused && !newline ) { printf("\n"); }
return true;
}
void usage(const char* argv0)
{
printf("usage: %s [--help | --version | --usage] [-c width] [<FILE> ...]\n", argv0);
}
void help(const char* argv0)
{
usage(argv0);
}
void version(const char* argv0)
{
printf("%s (sortix)\n", argv0);
}
int main(int argc, char* argv[])
{
struct winsize ws;
if ( tcgetwinsize(1, &ws) == 0 )
termwidth = ws.ws_col;
const char* argv0 = argv[0];
for ( int i = 1; i < argc; i++ )
{
const char* arg = argv[i];
if ( arg[0] != '-' ) { continue; }
if ( strcmp(arg, "-") == 0 ) { continue; }
argv[i] = NULL;
if ( strcmp(arg, "--") == 0 ) { break; }
if ( strcmp(arg, "--usage") == 0 ) { usage(argv0); exit(0); }
if ( strcmp(arg, "--help") == 0 ) { help(argv0); exit(0); }
if ( strcmp(arg, "--version") == 0 ) { version(argv0); exit(0); }
if ( strcmp(arg, "-c") == 0 )
{
if ( i+1 == argc ) { usage(argv0); exit(1); }
termwidth = atoi(argv[++i]); argv[i] = NULL;
continue;
}
error(0, 0, "unknown option %s", arg);
usage(argv0);
return 1;
}
bool hadany = false;
for ( int i = 1; i < argc; i++ )
{
const char* arg = argv[i];
if ( !arg ) { continue; }
bool isstdin = strcmp(arg, "-") == 0;
FILE* fp = isstdin ? stdin : fopen(arg, "r");
if ( !fp ) { error(1, errno, "fopen failed: %s", arg); }
hadany = true;
if ( !processfp(arg, fp) ) { return 1; }
if ( fp != stdin ) { fclose(fp); }
}
if ( !hadany )
{
if ( !processfp("-", stdin) ) { return 1; }
}
if ( !doformat() ) { exit(1); }
return 0;
}