From: Scott Worley Date: Wed, 13 Sep 2023 18:11:49 +0000 (-0700) Subject: Interactive mode: Prompt, feedback, & screen clearing X-Git-Tag: v1.0.0~13 X-Git-Url: http://git.scottworley.com/tl-append/commitdiff_plain/e81b7a5faa3c713ce4d4e0952d7640517f13ef69?hp=2998af81dfb7be9b5c1cfe6d7e5a5a167ebbfd81 Interactive mode: Prompt, feedback, & screen clearing --- diff --git a/tl-append.c b/tl-append.c index f8bacdd..c4a4ac6 100644 --- a/tl-append.c +++ b/tl-append.c @@ -1,11 +1,39 @@ +#define _POSIX_C_SOURCE 199309L + +#include #include #include +#include +#include +#include #include "common.h" const size_t BUF_SIZE = 1024; -static void read_line(char *buf) { +const char PROMPT[] = "\33[H" /* Move cursor 'home' */ + "\33[J" /* Clear screen */ + "> "; +const char ACKNOWLEDGE[] = "[OK]"; +const struct timespec ACKNOWLEDGE_DELAY = {0, 300000000}; + +typedef struct { + int interactive; +} conf_t; + +conf_t parse_command_line(int argc, char *argv[]) { + conf_t conf = {0}; + + if (argc == 2 && strcmp(argv[1], "-i") == 0 && isatty(2)) + conf.interactive = 1; + + return conf; +} + +static void read_line(conf_t conf, char *buf) { + if (conf.interactive) + if (fputs(PROMPT, stderr) == EOF) + die("I/O error writing prompt"); if (fgets(buf, BUF_SIZE, stdin) == NULL) { if (ferror(stdin)) die("I/O error reading line"); @@ -17,7 +45,7 @@ static void read_line(char *buf) { } } -static void write_line(const char *line) { +static void write_line(conf_t conf, const char *line) { const char *now = encode_time(time(NULL)); FILE *f = fopen(FILENAME, "a"); if (f == NULL) @@ -30,12 +58,19 @@ static void write_line(const char *line) { die("Error writing to output file"); if (fclose(f) != 0) die_err("Error closing output file"); + if (conf.interactive) { + if (fputs(ACKNOWLEDGE, stderr) == EOF) + die("Error writing acknowledgment"); + if (nanosleep(&ACKNOWLEDGE_DELAY, NULL) == -1 && errno != EINTR) + die_err("Error sleeping"); + } } -int main() { +int main(int argc, char *argv[]) { + conf_t conf = parse_command_line(argc, argv); char buf[BUF_SIZE]; - for (read_line(buf); buf[0]; read_line(buf)) { - write_line(buf); + for (read_line(conf, buf); buf[0]; read_line(conf, buf)) { + write_line(conf, buf); } return 0; }