watch: refactor code, add output_header() and run_command()
The main() was starting to be quite long with deep indents. Both signs of clean up being welcome change. FIXME: The comment also changes -g option to exit immediately, when screen contents change. This should be separated commit, e.g. the stuff is not ready to be merged. Signed-off-by: Sami Kerola <kerolasa@iki.fi>
This commit is contained in:
Sami Kerola
parent
dbedc905fe
commit
85e0a23347
583
watch.c
583
watch.c
@ -62,6 +62,16 @@
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# define isprint(x) ( (x>=' '&&x<='~') || (x>=0xa0) )
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#endif
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/* Boolean command line options */
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static int flags;
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#define WATCH_DIFF (1 << 1)
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#define WATCH_CUMUL (1 << 2)
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#define WATCH_EXEC (1 << 3)
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#define WATCH_BEEP (1 << 4)
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#define WATCH_COLOR (1 << 5)
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#define WATCH_ERREXIT (1 << 6)
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#define WATCH_CHGEXIT (1 << 7)
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static int curses_started = 0;
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static long height = 24, width = 80;
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static int screen_size_changed = 0;
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@ -285,15 +295,268 @@ wint_t my_getwc(FILE * s)
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}
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#endif /* WITH_WATCH8BIT */
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void output_header(char *restrict command, double interval)
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{
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time_t t = time(NULL);
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char *ts = ctime(&t);
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int tsl = strlen(ts);
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char *header;
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/*
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* left justify interval and command, right justify time,
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* clipping all to fit window width
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*/
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int hlen = asprintf(&header, _("Every %.1fs: "), interval);
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/*
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* the rules:
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* width < tsl : print nothing
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* width < tsl + hlen + 1: print ts
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* width = tsl + hlen + 1: print header, ts
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* width < tsl + hlen + 4: print header, ..., ts
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* width < tsl + hlen + wcommand_columns: print header,
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* truncated wcommand, ..., ts
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* width > "": print header, wcomand, ts
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* this is slightly different from how it used to be
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*/
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if (width < tsl) {
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free(header);
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return;
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}
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if (tsl + hlen + 1 <= width) {
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mvaddstr(0, 0, header);
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if (tsl + hlen + 2 <= width) {
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if (width < tsl + hlen + 4) {
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mvaddstr(0, width - tsl - 4, "... ");
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} else {
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#ifdef WITH_WATCH8BIT
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if (width < tsl + hlen + wcommand_columns) {
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/* print truncated */
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int available = width - tsl - hlen;
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int in_use = wcommand_columns;
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int wcomm_len = wcommand_characters;
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while (available - 4 < in_use) {
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wcomm_len--;
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in_use = wcswidth(wcommand, wcomm_len);
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}
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mvaddnwstr(0, hlen, wcommand, wcomm_len);
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mvaddstr(0, width - tsl - 4, "... ");
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} else {
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mvaddwstr(0, hlen, wcommand);
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}
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#else
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mvaddnstr(0, hlen, command, width - tsl - hlen);
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#endif /* WITH_WATCH8BIT */
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}
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}
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}
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mvaddstr(0, width - tsl + 1, ts);
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free(header);
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return;
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}
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int run_command(char *restrict command, char **restrict command_argv)
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{
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FILE *p;
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int x, y;
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int oldeolseen = 1;
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int pipefd[2];
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pid_t child;
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int exit_early = 0;
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int status;
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/* allocate pipes */
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if (pipe(pipefd) < 0)
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xerr(7, _("unable to create IPC pipes"));
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/* flush stdout and stderr, since we're about to do fd stuff */
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fflush(stdout);
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fflush(stderr);
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/* fork to prepare to run command */
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child = fork();
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if (child < 0) { /* fork error */
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xerr(2, _("unable to fork process"));
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} else if (child == 0) { /* in child */
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close(pipefd[0]); /* child doesn't need read side of pipe */
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close(1); /* prepare to replace stdout with pipe */
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if (dup2(pipefd[1], 1) < 0) { /* replace stdout with write side of pipe */
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xerr(3, _("dup2 failed"));
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}
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dup2(1, 2); /* stderr should default to stdout */
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if (flags & WATCH_EXEC) { /* pass command to exec instead of system */
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if (execvp(command_argv[0], command_argv) == -1) {
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xerr(4, _("unable to execute '%s'"),
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command_argv[0]);
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}
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} else {
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status = system(command); /* watch manpage promises sh quoting */
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/* propagate command exit status as child exit status */
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if (!WIFEXITED(status)) { /* child exits nonzero if command does */
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exit(EXIT_FAILURE);
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} else {
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exit(WEXITSTATUS(status));
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}
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}
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}
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/* otherwise, we're in parent */
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close(pipefd[1]); /* close write side of pipe */
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if ((p = fdopen(pipefd[0], "r")) == NULL)
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xerr(5, _("fdopen"));
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for (y = show_title; y < height; y++) {
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int eolseen = 0, tabpending = 0;
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#ifdef WITH_WATCH8BIT
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wint_t carry = WEOF;
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#endif
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for (x = 0; x < width; x++) {
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#ifdef WITH_WATCH8BIT
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wint_t c = ' ';
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#else
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int c = ' ';
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#endif
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int attr = 0;
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if (!eolseen) {
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/* if there is a tab pending, just
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* spit spaces until the next stop
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* instead of reading characters */
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if (!tabpending)
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#ifdef WITH_WATCH8BIT
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do {
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if (carry == WEOF) {
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c = my_getwc(p);
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} else {
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c = carry;
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carry = WEOF;
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}
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} while (c != WEOF && !isprint(c)
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&& c < 12
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&& wcwidth(c) == 0
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&& c != L'\n'
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&& c != L'\t'
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&& (c != L'\033'
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|| !(flags & WATCH_COLOR)));
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#else
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do
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c = getc(p);
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while (c != EOF && !isprint(c)
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&& c != '\n'
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&& c != '\t'
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&& (c != L'\033'
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|| !(flags & WATCH_COLOR)));
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#endif
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if (c == L'\033' && (flags & WATCH_COLOR)) {
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x--;
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process_ansi(p);
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continue;
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}
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if (c == L'\n')
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if (!oldeolseen && x == 0) {
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x = -1;
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continue;
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} else
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eolseen = 1;
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else if (c == L'\t')
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tabpending = 1;
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#ifdef WITH_WATCH8BIT
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if (x == width - 1 && wcwidth(c) == 2) {
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y++;
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x = -1; /* process this double-width */
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carry = c; /* character on the next line */
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continue; /* because it won't fit here */
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}
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if (c == WEOF || c == L'\n' || c == L'\t')
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c = L' ';
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#else
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if (c == EOF || c == '\n' || c == '\t')
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c = ' ';
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#endif
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if (tabpending && (((x + 1) % 8) == 0))
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tabpending = 0;
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}
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move(y, x);
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if (!first_screen && !exit_early && (flags & WATCH_CHGEXIT)) {
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#ifdef WITH_WATCH8BIT
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cchar_t oldc;
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in_wch(&oldc);
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exit_early = (wchar_t) c != oldc.chars[0];
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#else
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chtype oldch = inch();
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unsigned char oldc = oldch & A_CHARTEXT;
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exit_early = (unsigned char)c != oldc;
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#endif
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}
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if (flags & WATCH_DIFF) {
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#ifdef WITH_WATCH8BIT
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cchar_t oldc;
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in_wch(&oldc);
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attr = !first_screen
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&& ((wchar_t) c != oldc.chars[0]
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((flags & WATCH_CUMUL)
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&& (oldc.attr & A_ATTRIBUTES)));
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#else
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chtype oldch = inch();
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unsigned char oldc = oldch & A_CHARTEXT;
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attr = !first_screen
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&& ((unsigned char)c != oldc
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((flags & WATCH_CUMUL)
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&& (oldch & A_ATTRIBUTES)));
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#endif
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}
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if (attr)
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standout();
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#ifdef WITH_WATCH8BIT
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addnwstr((wchar_t *) & c, 1);
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#else
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addch(c);
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#endif
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if (attr)
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standend();
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#ifdef WITH_WATCH8BIT
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if (wcwidth(c) == 0) {
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x--;
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}
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if (wcwidth(c) == 2) {
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x++;
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}
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#endif
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}
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oldeolseen = eolseen;
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}
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fclose(p);
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/* harvest child process and get status, propagated from command */
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if (waitpid(child, &status, 0) < 0)
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xerr(8, _("waitpid"));
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/* if child process exited in error, beep if option_beep is set */
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if ((!WIFEXITED(status) || WEXITSTATUS(status))) {
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if (flags & WATCH_BEEP)
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beep();
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if (flags & WATCH_ERREXIT) {
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mvaddstr(height - 1, 0,
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_("command exit with a non-zero status, press a key to exit"));
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refresh();
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fgetc(stdin);
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endwin();
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exit(8);
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}
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}
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first_screen = 0;
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refresh();
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return exit_early;
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}
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int main(int argc, char *argv[])
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{
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int optc;
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int option_differences = 0,
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option_differences_cumulative = 0,
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option_exec = 0,
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option_beep = 0,
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option_color = 0,
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option_errexit = 0, option_chgexit = 0;
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double interval = 2;
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char *command;
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char **command_argv;
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@ -306,11 +569,6 @@ int main(int argc, char *argv[])
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int wcommand_characters = 0; /* not including final \0 */
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#endif /* WITH_WATCH8BIT */
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int pipefd[2];
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int status;
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int exit_early = 0;
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pid_t child;
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static struct option longopts[] = {
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{"color", no_argument, 0, 'c'},
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{"differences", optional_argument, 0, 'd'},
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@ -336,27 +594,27 @@ int main(int argc, char *argv[])
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!= EOF) {
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switch (optc) {
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case 'b':
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option_beep = 1;
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flags |= WATCH_BEEP;
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break;
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case 'c':
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option_color = 1;
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flags |= WATCH_COLOR;
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break;
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case 'd':
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option_differences = 1;
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flags |= WATCH_DIFF;
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if (optarg)
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option_differences_cumulative = 1;
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flags |= WATCH_CUMUL;
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break;
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case 'e':
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option_errexit = 1;
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flags |= WATCH_ERREXIT;
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break;
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case 'g':
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option_chgexit = 1;
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flags |= WATCH_CHGEXIT;
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break;
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case 't':
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show_title = 0;
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break;
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case 'x':
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option_exec = 1;
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flags |= WATCH_EXEC;
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break;
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case 'n':
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interval = strtod_or_err(optarg, _("failed to parse argument"));
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@ -431,13 +689,14 @@ int main(int argc, char *argv[])
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/* Set up tty for curses use. */
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curses_started = 1;
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initscr();
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if (option_color) {
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if (flags & WATCH_COLOR) {
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if (has_colors()) {
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start_color();
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use_default_colors();
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init_ansi_colors();
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} else
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option_color = 0;
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} else {
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flags |= WATCH_COLOR;
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}
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}
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nonl();
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noecho();
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@ -446,15 +705,7 @@ int main(int argc, char *argv[])
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if (precise_timekeeping)
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next_loop = get_time_usec();
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do {
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time_t t = time(NULL);
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char *ts = ctime(&t);
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int tsl = strlen(ts);
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char *header;
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FILE *p;
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int x, y;
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int oldeolseen = 1;
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while (1) {
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if (screen_size_changed) {
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get_terminal_size();
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resizeterm(height, width);
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@ -464,272 +715,11 @@ int main(int argc, char *argv[])
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first_screen = 1;
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}
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if (show_title) {
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/*
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* left justify interval and command, right
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* justify time, clipping all to fit window
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* width
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*/
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int hlen = asprintf(&header, _("Every %.1fs: "), interval);
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if (show_title)
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output_header(command, interval);
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/*
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* the rules:
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* width < tsl : print nothing
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* width < tsl + hlen + 1: print ts
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* width = tsl + hlen + 1: print header, ts
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* width < tsl + hlen + 4: print header, ..., ts
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* width < tsl + hlen + wcommand_columns: print
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* header, truncated wcommand,
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* ..., ts
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* width > "": print header, wcomand, ts
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* this is slightly different from how it used to be
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*/
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if (width >= tsl) {
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if (width >= tsl + hlen + 1) {
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mvaddstr(0, 0, header);
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if (width >= tsl + hlen + 2) {
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if (width < tsl + hlen + 4) {
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mvaddstr(0,
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width - tsl -
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4, "... ");
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} else {
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#ifdef WITH_WATCH8BIT
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if (width <
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tsl + hlen +
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wcommand_columns) {
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/* print truncated */
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int avail_columns = width - tsl - hlen;
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int using_columns = wcommand_columns;
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int using_characters = wcommand_characters;
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while (using_columns > avail_columns - 4) {
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using_characters--;
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using_columns
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=
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wcswidth
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(wcommand,
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using_characters);
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}
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mvaddnwstr(0,
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hlen,
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wcommand,
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using_characters);
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mvaddstr(0,
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width -
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tsl -
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4,
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"... ");
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} else {
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mvaddwstr(0,
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hlen,
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wcommand);
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}
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#else
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mvaddnstr(0, hlen,
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command,
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width - tsl -
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hlen);
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#endif /* WITH_WATCH8BIT */
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}
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}
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}
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mvaddstr(0, width - tsl + 1, ts);
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}
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free(header);
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}
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/* allocate pipes */
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if (pipe(pipefd) < 0)
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xerr(7, _("unable to create IPC pipes"));
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/* flush stdout and stderr, since we're about to do fd stuff */
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fflush(stdout);
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fflush(stderr);
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/* fork to prepare to run command */
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child = fork();
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if (child < 0) { /* fork error */
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xerr(2, _("unable to fork process"));
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} else if (child == 0) { /* in child */
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close(pipefd[0]); /* child doesn't need read side of pipe */
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close(1); /* prepare to replace stdout with pipe */
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if (dup2(pipefd[1], 1) < 0) { /* replace stdout with write side of pipe */
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xerr(3, _("dup2 failed"));
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}
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dup2(1, 2); /* stderr should default to stdout */
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if (option_exec) { /* pass command to exec instead of system */
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if (execvp(command_argv[0], command_argv) == -1) {
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xerr(4, _("unable to execute '%s'"), command_argv[0]);
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}
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} else {
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status = system(command); /* watch manpage promises sh quoting */
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/* propagate command exit status as child exit status */
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if (!WIFEXITED(status)) { /* child exits nonzero if command does */
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exit(EXIT_FAILURE);
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} else {
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exit(WEXITSTATUS(status));
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}
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}
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}
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/* otherwise, we're in parent */
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close(pipefd[1]); /* close write side of pipe */
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if ((p = fdopen(pipefd[0], "r")) == NULL)
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xerr(5, _("fdopen"));
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for (y = show_title; y < height; y++) {
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int eolseen = 0, tabpending = 0;
|
||||
#ifdef WITH_WATCH8BIT
|
||||
wint_t carry = WEOF;
|
||||
#endif /* WITH_WATCH8BIT */
|
||||
for (x = 0; x < width; x++) {
|
||||
#ifdef WITH_WATCH8BIT
|
||||
wint_t c = ' ';
|
||||
#else
|
||||
int c = ' ';
|
||||
#endif /* WITH_WATCH8BIT */
|
||||
int attr = 0;
|
||||
|
||||
if (!eolseen) {
|
||||
/* if there is a tab pending, just
|
||||
* spit spaces until the next stop
|
||||
* instead of reading characters */
|
||||
if (!tabpending)
|
||||
#ifdef WITH_WATCH8BIT
|
||||
do {
|
||||
if (carry == WEOF) {
|
||||
c = my_getwc(p);
|
||||
} else {
|
||||
c = carry;
|
||||
carry = WEOF;
|
||||
}
|
||||
} while (c != WEOF
|
||||
&& !isprint(c)
|
||||
&& c < 12
|
||||
&& wcwidth(c) == 0
|
||||
&& c != L'\n'
|
||||
&& c != L'\t'
|
||||
&& (c != L'\033'
|
||||
|| option_color !=
|
||||
1));
|
||||
#else
|
||||
do
|
||||
c = getc(p);
|
||||
while (c != EOF && !isprint(c)
|
||||
&& c != '\n'
|
||||
&& c != '\t'
|
||||
&& (c != L'\033'
|
||||
|| option_color !=
|
||||
1));
|
||||
#endif /* WITH_WATCH8BIT */
|
||||
if (c == L'\033' && option_color == 1) {
|
||||
x--;
|
||||
process_ansi(p);
|
||||
continue;
|
||||
}
|
||||
if (c == L'\n')
|
||||
if (!oldeolseen && x == 0) {
|
||||
x = -1;
|
||||
continue;
|
||||
} else
|
||||
eolseen = 1;
|
||||
else if (c == L'\t')
|
||||
tabpending = 1;
|
||||
#ifdef WITH_WATCH8BIT
|
||||
if (x == width - 1 && wcwidth(c) == 2) {
|
||||
y++;
|
||||
x = -1; /* process this double-width */
|
||||
carry = c; /* character on the next line */
|
||||
continue; /* because it won't fit here */
|
||||
}
|
||||
if (c == WEOF || c == L'\n'
|
||||
|| c == L'\t')
|
||||
c = L' ';
|
||||
#else
|
||||
if (c == EOF || c == '\n' || c == '\t')
|
||||
c = ' ';
|
||||
#endif /* WITH_WATCH8BIT */
|
||||
if (tabpending && (((x + 1) % 8) == 0))
|
||||
tabpending = 0;
|
||||
}
|
||||
move(y, x);
|
||||
if (!first_screen && !exit_early && option_chgexit) {
|
||||
#ifdef WITH_WATCH8BIT
|
||||
cchar_t oldc;
|
||||
in_wch(&oldc);
|
||||
exit_early = (wchar_t) c != oldc.chars[0];
|
||||
#else
|
||||
chtype oldch = inch();
|
||||
unsigned char oldc = oldch & A_CHARTEXT;
|
||||
exit_early = (unsigned char) c != oldc;
|
||||
#endif /* WITH_WATCH8BIT */
|
||||
}
|
||||
if (option_differences) {
|
||||
#ifdef WITH_WATCH8BIT
|
||||
cchar_t oldc;
|
||||
in_wch(&oldc);
|
||||
attr = !first_screen
|
||||
&& ((wchar_t) c != oldc.chars[0]
|
||||
||
|
||||
(option_differences_cumulative
|
||||
&& (oldc.
|
||||
attr & A_ATTRIBUTES)));
|
||||
#else
|
||||
chtype oldch = inch();
|
||||
unsigned char oldc = oldch & A_CHARTEXT;
|
||||
attr = !first_screen
|
||||
&& ((unsigned char)c != oldc
|
||||
||
|
||||
(option_differences_cumulative
|
||||
&& (oldch & A_ATTRIBUTES)));
|
||||
#endif /* WITH_WATCH8BIT */
|
||||
}
|
||||
if (attr)
|
||||
standout();
|
||||
#ifdef WITH_WATCH8BIT
|
||||
addnwstr((wchar_t *) & c, 1);
|
||||
#else
|
||||
addch(c);
|
||||
#endif /* WITH_WATCH8BIT */
|
||||
if (attr)
|
||||
standend();
|
||||
#ifdef WITH_WATCH8BIT
|
||||
if (wcwidth(c) == 0) {
|
||||
x--;
|
||||
}
|
||||
if (wcwidth(c) == 2) {
|
||||
x++;
|
||||
}
|
||||
#endif /* WITH_WATCH8BIT */
|
||||
}
|
||||
oldeolseen = eolseen;
|
||||
}
|
||||
|
||||
fclose(p);
|
||||
|
||||
/* harvest child process and get status, propagated from command */
|
||||
if (waitpid(child, &status, 0) < 0)
|
||||
xerr(8, _("waitpid"));
|
||||
|
||||
/* if child process exited in error, beep if option_beep is set */
|
||||
if ((!WIFEXITED(status) || WEXITSTATUS(status))) {
|
||||
if (option_beep)
|
||||
beep();
|
||||
if (option_errexit) {
|
||||
mvaddstr(height - 1, 0,
|
||||
_("command exit with a non-zero status, press a key to exit"));
|
||||
refresh();
|
||||
fgetc(stdin);
|
||||
endwin();
|
||||
exit(8);
|
||||
}
|
||||
}
|
||||
first_screen = 0;
|
||||
refresh();
|
||||
if (run_command(command, command_argv))
|
||||
break;
|
||||
if (precise_timekeeping) {
|
||||
watch_usec_t cur_time = get_time_usec();
|
||||
next_loop += USECS_PER_SEC * interval;
|
||||
@ -737,9 +727,8 @@ int main(int argc, char *argv[])
|
||||
usleep(next_loop - cur_time);
|
||||
} else
|
||||
usleep(interval * 1000000);
|
||||
} while (!exit_early);
|
||||
}
|
||||
|
||||
endwin();
|
||||
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user