New command, if-shell (alias if). Executes the tmux command in the second

argument if the shell command in the first succeeds, for example:

       if "[ -e ~/.tmux.conf.alt ]" "source .tmux.conf.alt"

Written by Tiago Cunha, many thanks.

1 files changed, 176 insertions, 0 deletions

diff --git a/cmd-if-shell.c b/cmd-if-shell.c
new file mode 100644
index 00000000..4f348a7e
--- /dev/null
+++ b/cmd-if-shell.c
@@ -0,0 +1,176 @@
+/* $OpenBSD$ */
+
+/*
+ * Copyright (c) 2009 Tiago Cunha <me@tiagocunha.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 MIND, 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/types.h>
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "tmux.h"
+
+/*
+ * Executes a tmux command if a shell command returns true.
+ */
+
+int	cmd_if_shell_parse(struct cmd *, int, char **, char **);
+int	cmd_if_shell_exec(struct cmd *, struct cmd_ctx *);
+void	cmd_if_shell_send(struct cmd *, struct buffer *);
+void	cmd_if_shell_recv(struct cmd *, struct buffer *);
+void	cmd_if_shell_free(struct cmd *);
+void	cmd_if_shell_init(struct cmd *, int);
+size_t	cmd_if_shell_print(struct cmd *, char *, size_t);
+
+struct cmd_if_shell_data {
+	char *cmd;
+	char *sh_cmd;
+};
+
+const struct cmd_entry cmd_if_shell_entry = {
+	"if-shell", "if",
+	"shell-command command",
+	0,
+	cmd_if_shell_init,
+	cmd_if_shell_parse,
+	cmd_if_shell_exec,
+	cmd_if_shell_send,
+	cmd_if_shell_recv,
+	cmd_if_shell_free,
+	cmd_if_shell_print
+};
+
+void
+cmd_if_shell_init(struct cmd *self, unused int arg)
+{
+	struct cmd_if_shell_data	*data;
+
+	self->data = data = xmalloc(sizeof *data);
+	data->cmd = NULL;
+	data->sh_cmd = NULL;
+}
+
+int
+cmd_if_shell_parse(struct cmd *self, int argc, char **argv, char **cause)
+{
+	struct cmd_if_shell_data	*data;
+	int				 opt;
+
+	self->entry->init(self, 0);
+	data = self->data;
+
+	while ((opt = getopt(argc, argv, "")) != -1) {
+		switch (opt) {
+		default:
+			goto usage;
+		}
+	}
+	argc -= optind;
+	argv += optind;
+	if (argc != 2)
+		goto usage;
+
+	data->sh_cmd = xstrdup(argv[0]);
+	data->cmd = xstrdup(argv[1]);
+	return (0);
+
+usage:
+	xasprintf(cause, "usage: %s %s", self->entry->name, self->entry->usage);
+
+	self->entry->free(self);
+	return (-1);
+}
+
+int
+cmd_if_shell_exec(struct cmd *self, struct cmd_ctx *ctx)
+{
+	struct cmd_if_shell_data	*data = self->data;
+	struct cmd_list			*cmdlist;
+	char				*cause;
+	int				 ret;
+
+	if ((ret = system(data->sh_cmd)) < 0) {
+		ctx->error(ctx, "system error: %s", strerror(errno));
+		return (-1);
+	} else if (ret != 0)
+		return (0);
+
+	if (cmd_string_parse(data->cmd, &cmdlist, &cause) != 0) {
+		if (cause != NULL) {
+			ctx->error(ctx, "%s", cause);
+			xfree(cause);
+		}
+		return (-1);
+	}
+
+	if (cmd_list_exec(cmdlist, ctx) < 0) {
+		cmd_list_free(cmdlist);
+		return (-1);
+	}
+
+	cmd_list_free(cmdlist);
+	return (0);
+}
+
+void
+cmd_if_shell_send(struct cmd *self, struct buffer *b)
+{
+	struct cmd_if_shell_data	*data = self->data;
+
+	buffer_write(b, data, sizeof *data);
+	cmd_send_string(b, data->cmd);
+	cmd_send_string(b, data->sh_cmd);
+}
+
+void
+cmd_if_shell_recv(struct cmd *self, struct buffer *b)
+{
+	struct cmd_if_shell_data	*data;
+
+	self->data = data = xmalloc(sizeof *data);
+	buffer_read(b, data, sizeof *data);
+	data->cmd = cmd_recv_string(b);
+	data->sh_cmd = cmd_recv_string(b);
+}
+
+void
+cmd_if_shell_free(struct cmd *self)
+{
+	struct cmd_if_shell_data	*data = self->data;
+
+	if (data->cmd != NULL)
+		xfree(data->cmd);
+	if (data->sh_cmd != NULL)
+		xfree(data->sh_cmd);
+	xfree(data);
+}
+
+size_t
+cmd_if_shell_print(struct cmd *self, char *buf, size_t len)
+{
+	struct cmd_if_shell_data	*data = self->data;
+	size_t				off = 0;
+
+	off += xsnprintf(buf, len, "%s", self->entry->name);
+	if (data == NULL)
+		return (off);
+	if (off < len && data->sh_cmd != NULL)
+		off += cmd_prarg(buf + off, len - off, " ", data->sh_cmd);
+	if (off < len && data->cmd != NULL)
+		off += cmd_prarg(buf + off, len - off, " ", data->cmd);
+	return (off);
+}