1 files changed, 56 insertions, 0 deletions
diff --git a/app/tools/halibut/help.c b/app/tools/halibut/help.c
new file mode 100644
index 0000000..8db2859
--- /dev/null
+++ b/app/tools/halibut/help.c
@@ -0,0 +1,56 @@
+/*
+ * help.c: usage instructions
+ */
+
+#include <stdio.h>
+#include "halibut.h"
+
+static const char *const helptext[] = {
+    "usage:   halibut [options] files",
+    "options: --text[=filename]     generate plain text output",
+    "         --html[=filename]     generate XHTML output",
+    "         --winhelp[=filename]  generate Windows Help output",
+    "         --man[=filename]      generate man page output",
+    "         --info[=filename]     generate GNU info output",
+    "         --ps[=filename]       generate PostScript output",
+    "         --pdf[=filename]      generate PDF output",
+    "         -Cfoo:bar:baz         append \\cfg{foo}{bar}{baz} to input",
+    "         --input-charset=cs    change default input file charset",
+    "         --list-charsets       display supported character set names",
+    "         --precise             report column numbers in error messages",
+    "         --help                display this text",
+    "         --version             display version number",
+    "         --licence             display licence text",
+    NULL
+};
+
+static const char *const usagetext[] = {
+    "usage: halibut [--format[=filename]] [options] file.but [file.but...]",
+    NULL
+};
+
+void help(void) {
+    const char *const *p;
+    for (p = helptext; *p; p++)
+	puts(*p);
+}
+
+void usage(void) {
+    const char *const *p;
+    for (p = usagetext; *p; p++)
+	puts(*p);
+}
+
+void showversion(void) {
+    printf("Halibut, %s\n", version);
+}
+
+void listcharsets(void) {
+    int i = 0, c;
+    do {
+	c = charset_localenc_nth(i);
+	if (c == CS_NONE) break;
+	printf("%s\n", charset_to_localenc(c));
+	i++;
+    } while (1);
+}