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-rw-r--r--plugin.c188
1 files changed, 188 insertions, 0 deletions
diff --git a/plugin.c b/plugin.c
new file mode 100644
index 0000000..c7d6b2e
--- /dev/null
+++ b/plugin.c
@@ -0,0 +1,188 @@
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "plugin.h"
+#include "util/argconfig.h"
+
+static int version(struct plugin *plugin)
+{
+ struct program *prog = plugin->parent;
+
+ if (plugin->name)
+ printf("%s %s version %s\n", prog->name, plugin->name, prog->version);
+ else
+ printf("%s version %s\n", prog->name, prog->version);
+ return 0;
+}
+
+static int help(int argc, char **argv, struct plugin *plugin)
+{
+ char man[0x100];
+ struct program *prog = plugin->parent;
+ char *str = argv[1];
+ int i;
+
+ if (argc == 1) {
+ general_help(plugin);
+ return 0;
+ }
+
+ for (i = 0; plugin->commands[i]; i++) {
+ struct command *cmd = plugin->commands[i];
+
+ if (strcmp(str, cmd->name))
+ if (!cmd->alias || (cmd->alias && strcmp(str, cmd->alias)))
+ continue;
+
+ if (plugin->name)
+ sprintf(man, "%s-%s-%s", prog->name, plugin->name, cmd->name);
+ else
+ sprintf(man, "%s-%s", prog->name, cmd->name);
+ if (execlp("man", "man", man, (char *)NULL))
+ perror(argv[1]);
+ }
+ return 0;
+}
+
+void usage(struct plugin *plugin)
+{
+ struct program *prog = plugin->parent;
+
+ if (plugin->name)
+ printf("usage: %s %s %s\n", prog->name, plugin->name, prog->usage);
+ else
+ printf("usage: %s %s\n", prog->name, prog->usage);
+}
+
+void general_help(struct plugin *plugin)
+{
+ struct program *prog = plugin->parent;
+ struct plugin *extension;
+ unsigned i = 0;
+ unsigned padding = 15;
+ unsigned curr_length = 0;
+ printf("%s-%s\n", prog->name, prog->version);
+
+ usage(plugin);
+
+ printf("\n");
+ print_word_wrapped(prog->desc, 0, 0);
+ printf("\n");
+
+ if (plugin->desc) {
+ printf("\n");
+ print_word_wrapped(plugin->desc, 0, 0);
+ printf("\n");
+ }
+
+ printf("\nThe following are all implemented sub-commands:\n");
+
+ /* iterate through all commands to get maximum length */
+ /* Still need to handle the case of ultra long strings, help messages, etc */
+ for (; plugin->commands[i]; i++)
+ if (padding < (curr_length = 2 + strlen(plugin->commands[i]->name)))
+ padding = curr_length;
+
+ i = 0;
+ for (; plugin->commands[i]; i++)
+ printf(" %-*s %s\n", padding, plugin->commands[i]->name,
+ plugin->commands[i]->help);
+
+ printf(" %-*s %s\n", padding, "version", "Shows the program version");
+ printf(" %-*s %s\n", padding, "help", "Display this help");
+ printf("\n");
+
+ if (plugin->name)
+ printf("See '%s %s help <command>' for more information on a specific command\n",
+ prog->name, plugin->name);
+ else
+ printf("See '%s help <command>' for more information on a specific command\n",
+ prog->name);
+
+ /* The first plugin is the built-in. If we're not showing help for the
+ * built-in, don't show the program's other extensions */
+ if (plugin->name)
+ return;
+
+ extension = prog->extensions->next;
+ if (!extension)
+ return;
+
+ printf("\nThe following are all installed plugin extensions:\n");
+ while (extension) {
+ printf(" %-*s %s\n", 15, extension->name, extension->desc);
+ extension = extension->next;
+ }
+ printf("\nSee '%s <plugin> help' for more information on a plugin\n",
+ prog->name);
+}
+
+int handle_plugin(int argc, char **argv, struct plugin *plugin)
+{
+ unsigned i = 0;
+ char *str = argv[0];
+ char use[0x100];
+
+ struct plugin *extension;
+ struct program *prog = plugin->parent;
+
+ if (!argc) {
+ general_help(plugin);
+ return 0;
+ }
+
+ if (!plugin->name)
+ sprintf(use, "%s %s <device> [OPTIONS]", prog->name, str);
+ else
+ sprintf(use, "%s %s %s <device> [OPTIONS]", prog->name, plugin->name, str);
+ argconfig_append_usage(use);
+
+ /* translate --help and --version into commands */
+ while (*str == '-')
+ str++;
+
+ if (!strcmp(str, "help"))
+ return help(argc, argv, plugin);
+ if (!strcmp(str, "version"))
+ return version(plugin);
+
+ for (; plugin->commands[i]; i++) {
+ struct command *cmd = plugin->commands[i];
+
+ if (strcmp(str, cmd->name))
+ if (!cmd->alias || (cmd->alias && strcmp(str, cmd->alias)))
+ continue;
+
+ return (cmd->fn(argc, argv, cmd, plugin));
+ }
+
+ /* Check extensions only if this is running the built-in plugin */
+ if (plugin->name) {
+ printf("ERROR: Invalid sub-command '%s' for plugin %s\n", str, plugin->name);
+ return -ENOTTY;
+ }
+
+ extension = plugin->next;
+ while (extension) {
+ if (!strcmp(str, extension->name))
+ return handle_plugin(argc - 1, &argv[1], extension);
+ extension = extension->next;
+ }
+
+ /* If the command is executed with the extension name and
+ * command together ("plugin-command"), run the plug in */
+ extension = plugin->next;
+ while (extension) {
+ if (!strncmp(str, extension->name, strlen(extension->name))) {
+ argv[0] += strlen(extension->name);
+ while (*argv[0] == '-')
+ argv[0]++;
+ return handle_plugin(argc, &argv[0], extension);
+ }
+ extension = extension->next;
+ }
+ printf("ERROR: Invalid sub-command '%s'\n", str);
+ return -ENOTTY;
+}