dotfiles

commit b140a8a0e418d5d0583df15655023e236be446f7
parent 3f41c8c96e27600924aaefa6b205442159bc05f9
Author: Anders Damsgaard <anders@adamsgaard.dk>
Date:   Tue, 30 Jul 2019 14:14:54 +0200

Add own watch implementation

Diffstat:
A
.local/lib/watch/Makefile
 | 
35
+++++++++++++++++++++++++++++++++++
A
.local/lib/watch/watch.c
 | 
137
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

2 files changed, 172 insertions(+), 0 deletions(-)
diff --git a/.local/lib/watch/Makefile b/.local/lib/watch/Makefile
@@ -0,0 +1,35 @@
+CFLAGS = -g -std=c99 -pedantic -Wall
+LDFLAGS = -lm
+SRC = $(wildcard *.c)
+OBJ = $(patsubst %.c,%.o,$(SRC))
+HDR = $(wildcard *.h)
+BIN = ./watch
+
+PREFIX ?= ~/.local/bin
+INSTALL ?= install
+STRIP ?= strip
+
+default: $(BIN)
+
+$(BIN): $(OBJ) $(HDR)
+	$(CC) $(LDFLAGS) $(OBJ) -o $@
+
+install: $(BIN)
+	$(STRIP) $(BIN)
+	$(INSTALL) -m 0755 -d $(DESTDIR)$(PREFIX)/bin
+	$(INSTALL) -m 0755 $(BIN) $(DESTDIR)$(PREFIX)/bin
+
+uninstall:
+	$(RM) $(DESTDIR)$(PREFIX)/bin/$(BIN)
+
+memtest: $(BIN)
+	valgrind --error-exitcode=1 --leak-check=full $(BIN) -h
+	valgrind --error-exitcode=1 --leak-check=full $(BIN) -v
+	valgrind --error-exitcode=1 --leak-check=full $(BIN) -q -r 2 date
+	valgrind --error-exitcode=1 --leak-check=full $(BIN) -q -n 2 -r 2 ls
+
+clean:
+	$(RM) *.o
+	$(RM) $(BIN)
+
+.PHONY: default install uninstall memtest clean
diff --git a/.local/lib/watch/watch.c b/.local/lib/watch/watch.c
@@ -0,0 +1,137 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <string.h>
+#include <unistd.h>
+
+#define VERSION "0.1.0"
+#define PROGNAME "watch"
+
+void
+usage(int interval)
+{
+	printf("%s: %s [OPTIONS] COMMAND\n"
+	       "will repeatedly run COMMAND every %d seconds.\n"
+	       "Following OPTIONS are valid:\n"
+	       "  -h, --help              show this message\n"
+	       "  -v, --version           show version and license information\n"
+	       "  -n, --interval SECONDS  set interval between command invocations\n"
+	       "  -r, --repeat N          repeat for N times and then quit\n"
+	       "  -q, --quiet             suppress output (stdout) from COMMAND\n"
+	       "  -c, --no-clear          do not clear screen between COMMAND calls\n"
+	       "  --                      do not consider any following args as options\n"
+	       ,
+	       __func__, PROGNAME, interval);
+}
+
+void
+version()
+{
+	printf("%s version %s\n"
+	       "Licensed under the GNU Public License, v3+\n"
+	       "Written by Anders Damsgaard, anders@adamsgaard.dk\n",
+	       PROGNAME, VERSION);
+}
+
+void
+die(char* error_message)
+{
+	fprintf(stderr, "%s", error_message);
+	exit(1);
+}
+
+void
+run_cmd(int sleeptime, char* command, int quiet, int clearscreen)
+{
+	if (!quiet) {
+		if (clearscreen)
+			printf("\e[1;1H\e[2J");  /* clear screen (POSIX) */
+		else
+			puts("");
+		printf("Every %ds: %s\n\n", sleeptime, command);
+	}
+	if (quiet)
+		strcat(command, " >/dev/null");
+	system(command);
+	sleep(sleeptime);
+}
+
+int
+main(int argc, char* argv[])
+{
+	int i, opt;
+	int interval, repeat, quiet, clearscreen;
+	const char* optstring;
+	char* command;
+
+	interval = 5;
+	quiet = 0;
+	optstring = "hvn:r:qc";
+	const struct option longopts[] = {
+		{"help",      no_argument,         NULL,  'h'},
+		{"version",   no_argument,         NULL,  'v'},
+		{"interval",  required_argument,   NULL,  'n'},
+		{"repeat",    required_argument,   NULL,  'r'},
+		{"quiet",     no_argument,         NULL,  'q'},
+		{"no-clear",  no_argument,         NULL,  'c'},
+		{NULL,        0,                   NULL,   0}
+	};
+
+	repeat = 0;
+	clearscreen = 1;
+	while ((opt = getopt_long(argc, argv, optstring, longopts, NULL)) != -1) {
+		switch (opt) {
+			case -1:   /* no more arguments */
+			case 0:    /* long options toggles*/
+				break;
+			case 'h':
+				usage(interval);
+				return 0;
+			case 'v':
+				version();
+				return 0;
+			case 'n':
+				interval = atoi(optarg);
+				break;
+			case 'r':
+				repeat = atoi(optarg);
+				break;
+			case 'q':
+				quiet = 1;
+				break;
+			case 'c':
+				clearscreen = 0;
+				break;
+			default:
+				fprintf(stderr, "%s: invalid option -- %c\n", argv[0], opt);
+				fprintf(stderr, "try `%s --help` for more information\n",
+				        argv[0]);
+				return -2;
+		}
+	}
+
+	if (optind == argc)
+		die("error: no COMMAND specified\n");
+
+	if ((command = malloc(512)) != NULL) {
+		command[0] = '\0';
+		strcat(command, "[ -f ~/.commands.sh ] && . ~/.commands.sh; ");
+		for (i=optind; i<argc; ++i) {
+			strcat(command, argv[i]);
+			if (i < argc-1)
+				strcat(command, " ");
+		}
+	} else {
+		die("command malloc failed");
+	}
+
+	if (repeat > 0) {
+		for (i=0; i<repeat; ++i)
+			run_cmd(interval, command, quiet, clearscreen);
+	} else {
+		for (;;)
+			run_cmd(interval, command, quiet, clearscreen);
+	}
+	free(command);
+	return 0;
+}