Added function to print content from file (#331)

Added a function to print file contents to status bar without newlines.
Added tests for print file contents function
Added manpage entry for file contents

1 files changed, 73 insertions, 0 deletions

diff --git a/src/print_file_contents.c b/src/print_file_contents.c
new file mode 100644
index 0000000..afbe3e3
--- /dev/null
+++ b/src/print_file_contents.c
@@ -0,0 +1,73 @@
+// vim:ts=4:sw=4:expandtab
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <yajl/yajl_gen.h>
+#include <yajl/yajl_version.h>
+#include <sys/types.h>
+
+#include <sys/fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include "i3status.h"
+
+static void *scalloc(size_t size) {
+    void *result = calloc(size, 1);
+    if (result == NULL) {
+        die("Error: out of memory (calloc(%zu))\n", size);
+    }
+    return result;
+}
+
+void print_file_contents(yajl_gen json_gen, char *buffer, const char *title, const char *path, const char *format, const char *format_bad, const int max_chars) {
+    const char *walk = format;
+    char *outwalk = buffer;
+    char *buf = scalloc(max_chars * sizeof(char));
+
+    int n = -1;
+    int fd = open(path, O_RDONLY);
+
+    INSTANCE(path);
+
+    if (fd > -1) {
+        n = read(fd, buf, max_chars);
+        if (n != -1) {
+            buf[n] = '\0';
+        }
+        (void)close(fd);
+        START_COLOR("color_good");
+    } else if (errno != 0) {
+        walk = format_bad;
+        START_COLOR("color_bad");
+    }
+
+    for (; *walk != '\0'; walk++) {
+        if (*walk != '%') {
+            *(outwalk++) = *walk;
+        } else if (BEGINS_WITH(walk + 1, "title")) {
+            outwalk += sprintf(outwalk, "%s", title);
+            walk += strlen("title");
+        } else if (BEGINS_WITH(walk + 1, "content")) {
+            for (char *s = buf; *s != '\0' && n > 0; s++, n--) {
+                if (*s != '\n') {
+                    *(outwalk++) = *s;
+                }
+            }
+            walk += strlen("content");
+        } else if (BEGINS_WITH(walk + 1, "errno")) {
+            outwalk += sprintf(outwalk, "%d", errno);
+            walk += strlen("errno");
+        } else if (BEGINS_WITH(walk + 1, "error")) {
+            outwalk += sprintf(outwalk, "%s", strerror(errno));
+            walk += strlen("error");
+        } else {
+            *(outwalk++) = '%';
+        }
+    }
+
+    free(buf);
+
+    END_COLOR;
+    OUTPUT_FULL_TEXT(buffer);
+}