Add script blockcustom-block

1 files changed, 87 insertions, 0 deletions

diff --git a/src/blocks/script.c b/src/blocks/script.c
new file mode 100644
index 0000000..fa3a9d9
--- /dev/null
+++ b/src/blocks/script.c
@@ -0,0 +1,87 @@
+#include <string.h>
+#include <stdio.h>
+#include <assert.h>
+#include <stdlib.h>
+
+#include "../block.h"
+
+#include "../any_log.h"
+
+typedef struct {
+    block_text_t block;
+    char *script;
+} block_script_t;
+
+static const struct timespec block_script_interval = {
+    .tv_sec = 30,
+    .tv_nsec = 0,
+};
+
+static void block_script_update(block_t *block)
+{
+    block_script_t *script = (block_script_t *)block;
+
+    FILE *output = popen(script->script, "r");
+    if (output == NULL) {
+        log_value_debug("Failed to execute a script",
+                        "s:label", block->label,
+                        "s:script", script->script,
+                        "i:errno", errno);
+        return;
+    }
+
+    char buffer[128] = { 0 };
+    fgets(buffer, sizeof(buffer), output);
+    pclose(output);
+
+    log_value_debug("Executed a script",
+                    "s:label", block->label,
+                    "s:script", script->script);
+
+    free(script->block.text);
+    script->block.text = strcopy(buffer);
+    assert(script->block.text != NULL);
+}
+
+static block_t *block_script_alloc(const block_scheme_t *scheme)
+{
+    block_t *block = calloc(1, sizeof(block_script_t));
+    block->type = BLOCK_TEXT;
+    block->update_interval = block_script_interval;
+    block->update_fn = block_script_update;
+    return block;
+}
+
+static void block_script_clean(block_t *block)
+{
+    block_script_t *script = (block_script_t *)block;
+    free(script->script);
+    free(script->block.text);
+}
+
+static bool block_script_validate(block_t *block, const block_scheme_t *scheme)
+{
+    block_script_t *script = (block_script_t *)block;
+
+    if (script->block.text == NULL) {
+        log_error("Block '%s' requires key '%s'", block->label, "text");
+        return false;
+    }
+
+    script->script = script->block.text;
+    script->block.text = NULL;
+    return true;
+}
+
+static const config_entry_t block_script_entries[] = {
+    { 0 },
+};
+
+const block_scheme_t block_script_scheme = {
+    .name = "script",
+    .entries = block_script_entries,
+    .alloc_fn = block_script_alloc,
+    .clean_fn = block_script_clean,
+    .validate_fn = block_script_validate,
+    .resolve_fn = NULL,
+};