feat: added dvtm underneath source tree

3 files changed, 207 insertions, 0 deletions

diff --git a/bin/dvtm-editor.c b/bin/dvtm-editor.c
new file mode 100644
index 0000000..45a61b2
--- /dev/null
+++ b/bin/dvtm-editor.c
@@ -0,0 +1,180 @@
+/* Invoke $EDITOR as a filter.
+ *
+ * Copyright (c) 2016 Dmitry Bogatov <KAction@gnu.org>
+ * Copyright (c) 2017 Marc André Tanner <mat@brain-dump.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+static void error(const char *msg, ...) {
+	va_list ap;
+	va_start(ap, msg);
+	vfprintf(stderr, msg, ap);
+	va_end(ap);
+	if (errno)
+		fprintf(stderr, ": %s", strerror(errno));
+	fprintf(stderr, "\n");
+}
+
+int main(int argc, char *argv[])
+{
+	int exit_status = EXIT_FAILURE, tmp_write = -1;
+
+	const char *editor = getenv("DVTM_EDITOR");
+	if (!editor)
+		editor = getenv("VISUAL");
+	if (!editor)
+		editor = getenv("EDITOR");
+	if (!editor)
+		editor = "vi";
+
+	char tempname[] = "/tmp/dvtm-editor.XXXXXX";
+	if ((tmp_write = mkstemp(tempname)) == -1) {
+		error("failed to open temporary file `%s'", tempname);
+		goto err;
+	}
+
+	/* POSIX does not mandates modes of temporary file. */
+	if (fchmod(tmp_write, 0600) == -1) {
+		error("failed to change mode of temporary file `%s'", tempname);
+		goto err;
+	}
+
+	char buffer[2048];
+	ssize_t bytes;
+	while ((bytes = read(STDIN_FILENO, buffer, sizeof(buffer))) > 0) {
+		do {
+			ssize_t written = write(tmp_write, buffer, bytes);
+			if (written == -1) {
+				error("failed to write data to temporary file `%s'",
+				      tempname);
+				goto err;
+			}
+			bytes -= written;
+		} while (bytes > 0);
+	}
+
+	if (fsync(tmp_write) == -1) {
+		error("failed to fsync temporary file `%s'", tempname);
+		goto err;
+	}
+
+	struct stat stat_before;
+	if (fstat(tmp_write, &stat_before) == -1) {
+		error("failed to stat newly created temporary file `%s'", tempname);
+		goto err;
+	}
+
+	if (close(tmp_write) == -1) {
+		error("failed to close temporary file `%s'", tempname);
+		goto err;
+	}
+
+	pid_t pid = fork();
+	if (pid == -1) {
+		error("failed to fork editor process");
+		goto err;
+	} else if (pid == 0) {
+		int tty = open("/dev/tty", O_RDWR);
+		if (tty == -1) {
+			error("failed to open /dev/tty");
+			_exit(1);
+		}
+
+		if (dup2(tty, STDIN_FILENO) == -1) {
+			error("failed to set tty as stdin");
+			_exit(1);
+		}
+
+		if (dup2(tty, STDOUT_FILENO) == -1) {
+			error("failed to set tty as stdout");
+			_exit(1);
+		}
+
+		if (dup2(tty, STDERR_FILENO) == -1) {
+			error("failed to set tty as stderr");
+			_exit(1);
+		}
+
+		close(tty);
+
+		const char *editor_argv[argc+2];
+		editor_argv[0] = editor;
+		for (int i = 1; i < argc; i++)
+			editor_argv[i] = argv[i];
+		editor_argv[argc] = tempname;
+		editor_argv[argc+1] = NULL;
+
+		execvp(editor, (char* const*)editor_argv);
+		error("failed to exec editor process `%s'", editor);
+		_exit(127);
+	}
+
+	int status;
+	if (waitpid(pid, &status, 0) == -1) {
+		error("waitpid failed");
+		goto err;
+	}
+	if (!WIFEXITED(status)) {
+		error("editor invocation failed");
+		goto err;
+	}
+	if ((status = WEXITSTATUS(status)) != 0) {
+		error("editor terminated with exit status: %d", status);
+		goto err;
+	}
+
+	int tmp_read = open(tempname, O_RDONLY);
+	if (tmp_read == -1) {
+		error("failed to open for reading of edited temporary file `%s'",
+		      tempname);
+		goto err;
+	}
+
+	struct stat stat_after;
+	if (fstat(tmp_read, &stat_after) == -1) {
+		error("failed to stat edited temporary file `%s'", tempname);
+		goto err;
+	}
+
+	if (stat_before.st_mtime == stat_after.st_mtime)
+		goto ok; /* no modifications */
+
+	while ((bytes = read(tmp_read, buffer, sizeof(buffer))) > 0) {
+		do {
+			ssize_t written = write(STDOUT_FILENO, buffer, bytes);
+			if (written == -1) {
+				error("failed to write data to stdout");
+				goto err;
+			}
+			bytes -= written;
+		} while (bytes > 0);
+	}
+
+ok:
+	exit_status = EXIT_SUCCESS;
+err:
+	if (tmp_write != -1)
+		unlink(tempname);
+	return exit_status;
+}
diff --git a/bin/dvtm-pager b/bin/dvtm-pager
new file mode 100755
index 0000000..975582b
--- /dev/null
+++ b/bin/dvtm-pager
@@ -0,0 +1,11 @@
+#!/bin/sh
+
+if [ ! -z "$DVTM_PAGER" ]; then
+	PAGER="$DVTM_PAGER"
+elif [ ! -z "$PAGER" ]; then
+	PAGER="$PAGER"
+else
+	PAGER="less -R"
+fi
+
+exec $PAGER "$@"
diff --git a/bin/dvtm-status b/bin/dvtm-status
new file mode 100755
index 0000000..f841e3f
--- /dev/null
+++ b/bin/dvtm-status
@@ -0,0 +1,16 @@
+#!/bin/sh
+
+FIFO="/tmp/dvtm-status.$$"
+
+[ -p "$FIFO" ] || mkfifo -m 600 "$FIFO" || exit 1
+
+while true; do
+	date +%H:%M
+	sleep 60
+done > "$FIFO" &
+
+STATUS_PID=$!
+dvtm -s "$FIFO" "$@" 2> /dev/null
+kill $STATUS_PID
+wait $STATUS_PID 2> /dev/null
+rm -f "$FIFO"