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	Make command exec functions return an enum rather than -1/0/1 values and
add a new value to mean "leave client running but don't attach" to fix problems with using some commands in a command sequence. Most of the work by Thomas Adam, problem reported by "jspenguin" on SF bug 3535531.
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		@@ -27,7 +27,7 @@
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 * Show environment.
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 */
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int	cmd_show_environment_exec(struct cmd *, struct cmd_ctx *);
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enum cmd_retval	 cmd_show_environment_exec(struct cmd *, struct cmd_ctx *);
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const struct cmd_entry cmd_show_environment_entry = {
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	"show-environment", "showenv",
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@@ -39,7 +39,7 @@ const struct cmd_entry cmd_show_environment_entry = {
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	cmd_show_environment_exec
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};
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int
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enum cmd_retval
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cmd_show_environment_exec(struct cmd *self, struct cmd_ctx *ctx)
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{
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	struct args		*args = self->args;
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@@ -51,7 +51,7 @@ cmd_show_environment_exec(struct cmd *self, struct cmd_ctx *ctx)
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		env = &global_environ;
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	else {
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		if ((s = cmd_find_session(ctx, args_get(args, 't'), 0)) == NULL)
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			return (-1);
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			return (CMD_RETURN_ERROR);
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		env = &s->environ;
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	}
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@@ -59,13 +59,13 @@ cmd_show_environment_exec(struct cmd *self, struct cmd_ctx *ctx)
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		envent = environ_find(env, args->argv[0]);
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		if (envent == NULL) {
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			ctx->error(ctx, "unknown variable: %s", args->argv[0]);
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			return (-1);
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			return (CMD_RETURN_ERROR);
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		}
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		if (envent->value != NULL)
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			ctx->print(ctx, "%s=%s", envent->name, envent->value);
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		else
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			ctx->print(ctx, "-%s", envent->name);
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		return (0);
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		return (CMD_RETURN_NORMAL);
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	}
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	RB_FOREACH(envent, environ, env) {
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@@ -75,5 +75,5 @@ cmd_show_environment_exec(struct cmd *self, struct cmd_ctx *ctx)
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			ctx->print(ctx, "-%s", envent->name);
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	}
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	return (0);
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	return (CMD_RETURN_NORMAL);
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}
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