Add basic piped input support

This commit is contained in:
0xf8 2023-06-03 16:50:52 -04:00
parent 78f1ad7362
commit 24a8565f6d
Signed by: 0xf8
GPG Key ID: 446580D758689584
3 changed files with 60 additions and 26 deletions

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@ -14,8 +14,14 @@ OR
## runtime configuration
This is done by setting environment variables.
- `RBTEXT_FULLSCREEN` (default: Enabled) - Clear screen every print (useful for text that will wrap)
- `RBTEXT_FULLSCREEN` (default: Enabled, force disable when non-tty) - Clear screen every print (useful for text that will wrap)
### example
Runs rbtext without clearing the screen everytime
Runs rbtext without clearing the screen everytime <br/>
`RBTEXT_FULLSCREEN=-1 ./rbtext hello world`
<hr/>
Runs rbtext with piped input <br/>
`echo "hello world" | ./rbtext`
## note on piped input
Piping input will cause rbtext to stop refreshing the screen. This is because it expects constant output, like in the following command: `cat /dev/urandom | base -w 0 | ./rbtext`

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@ -0,0 +1 @@
text

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@ -16,7 +16,7 @@ this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <memory.h>
//#include <memory.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@ -31,7 +31,7 @@ this program. If not, see <https://www.gnu.org/licenses/>.
#define CONF_SLEEP_TIMESEC (time_t)0
// How many times a color should be shown before switching to the next ( DEFAULT
// = 2 )
#define CONF_COLOR_LAG 2
#define CONF_COLOR_LAG 3
// Don't set to 0
// Disabled = -1
@ -53,15 +53,33 @@ const char *COLORS[] = {
"193;71;153", // PINK
};
// Used for detecting pipe, don't change!
uint use_pipe = 0;
unsigned long COLORS_SIZE = sizeof(COLORS) / sizeof(char *);
unsigned long long t = 0;
void genColors(char *s) {
char *cstr = (char *)malloc(64 + 1);
for (unsigned long i = 0; i < strlen(s); i++) {
unsigned long c = ((t + i) / CONF_COLOR_LAG) % COLORS_SIZE;
snprintf(cstr, 64, "\e[38;2;%sm", COLORS[c]);
printf("%s%c\e[0m", cstr, s[i]);
if (use_pipe) {
char *buffer = (char *)malloc(1024 + 1);
long r = read(STDIN_FILENO, buffer, 1024);
if (r < 1) return;
for (unsigned long i = 0; i < r; i++) {
unsigned long c = ((t + 1) / CONF_COLOR_LAG) % COLORS_SIZE;
snprintf(cstr, 64, "\e[38;2;%sm", COLORS[c]);
printf("%s%c\e[0m", cstr, buffer[i]);
}
free(buffer);
} else {
for (unsigned long i = 0; i < strlen(s); i++) {
unsigned long c = ((t + i) / CONF_COLOR_LAG) % COLORS_SIZE;
snprintf(cstr, 64, "\e[38;2;%sm", COLORS[c]);
printf("%s%c\e[0m", cstr, s[i]);
}
}
free(cstr);
@ -79,42 +97,51 @@ void set_flag(int *flag, const char *env) {
}
int main(int argc, char **argv) {
if (argc < 2) {
if (!isatty(STDIN_FILENO)) {
use_pipe = 1;
} else if (argc < 2) {
// [ERROR] No arguments given. USAGE: ... <text>
printf("\e[1;31m[ERROR]\e[0m No arguments given.\n\tUSAGE: \e[34m%s "
"\e[33m<text>\e[0m\n",
"\e[33m[<text>...]\e[0m\n",
argv[0]);
return 1;
}
set_flag(&FLAG_FULLSCREEN, "RBTEXT_FULLSCREEN");
uint reqSize = 0;
for (int i = 1; i < argc; i++) {
reqSize += strlen(argv[i]);
}
char *text;
if (!use_pipe) {
uint reqSize = 0;
for (int i = 1; i < argc; i++) {
reqSize += strlen(argv[i]);
}
char *text = (char *)malloc(reqSize + argc);
text = (char *)malloc(reqSize + argc);
// Adds all the arguments together with spaces seperating them
for (int i = 1, j = 0; i < argc; i++) {
for (unsigned int k = 0; k < strlen(argv[i]); k++, j++)
text[j] = argv[i][k];
// Adds all the arguments together with spaces seperating them
for (int i = 1, j = 0; i < argc; i++) {
for (unsigned int k = 0; k < strlen(argv[i]); k++, j++)
text[j] = argv[i][k];
text[j] = ' ';
j++;
text[j] = ' ';
j++;
}
}
struct timespec rem,
req = {CONF_SLEEP_TIMESEC, CONF_SLEEP_TIMEMS * 1000 * 1000};
while (1) {
if (FLAG_FULLSCREEN == 1)
printf("\e[2J\e[f");
else
printf("\r");
if (!use_pipe) {
if (FLAG_FULLSCREEN == 1)
printf("\e[2J\e[f");
else
printf("\r");
}
genColors(text);
fflush(stdout);
nanosleep(&req, &rem);
t += 1;
}