1 file changed, 92 insertions, 0 deletions
diff --git a/source/shared.h b/source/shared.h
new file mode 100644
index 0000000..9f4cba3
--- /dev/null
+++ b/source/shared.h
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+/*
+ * The helpers that belong to no single page. Repository registration, the
+ * lifetimes of the reference and commit records the renderers build, thin
+ * wrappers over git's diff machinery, and a handful of string, date and
+ * mimetype utilities all live here because several renderers need them. The
+ * two process-wide globals, ctx and cgit_repolist, are defined here as well.
+ */
+
+#ifndef CGIT_SHARED_H
+#define CGIT_SHARED_H
+
+#include "cgit.h"
+
+extern char *cgit_default_repo_desc;
+
+typedef void (*filepair_fn)(struct diff_filepair *pair);
+typedef void (*linediff_fn)(char *line, int len);
+
+/*
+ * Each of these returns its argument untouched when the syscall it wraps
+ * succeeded, and dies with the message and errno otherwise.
+ */
+extern int cgit_die_unless_zero(int result, const char *msg);
+extern int cgit_die_unless_positive(int result, const char *msg);
+extern int cgit_die_unless_non_negative(int result, const char *msg);
+
+/*
+ * Append a repository to cgit_repolist and return it, seeded from the current
+ * global configuration. The returned pointer is invalidated by the next call,
+ * because the list grows by reallocation.
+ */
+extern struct cgit_repo *cgit_add_repo(const char *url);
+extern struct cgit_repo *cgit_get_repoinfo(const char *url);
+
+// Export the CGIT_REPO_* variables that filters and hooks read.
+extern void cgit_prepare_repo_env(struct cgit_repo *repo);
+
+extern void cgit_free_reflist_inner(struct reflist *list);
+
+// Matches git's reference iteration callback, and appends each ref it is
+// given to the struct reflist passed as cb_data.
+extern int cgit_refs_cb(const struct reference *ref, void *cb_data);
+
+extern void cgit_free_commitinfo(struct commitinfo *info);
+extern void cgit_free_taginfo(struct taginfo *info);
+
+extern void cgit_diff_tree_cb(struct diff_queue_struct *q,
+			      struct diff_options *options, void *data);
+
+/*
+ * Diff two blobs and hand fn one line at a time. Returns non-zero when either
+ * blob could not be read. A blob that is binary or larger than max-blob-size
+ * sets binary instead, and produces no lines, so the caller can offer a link
+ * in place of the content.
+ */
+extern int cgit_diff_files(const struct object_id *old_oid,
+			   const struct object_id *new_oid,
+			   unsigned long *old_size, unsigned long *new_size,
+			   int *binary, int context, int ignorews,
+			   linediff_fn fn);
+
+extern void cgit_diff_tree(const struct object_id *old_oid,
+			   const struct object_id *new_oid,
+			   filepair_fn fn, const char *prefix, int ignorews);
+extern void cgit_diff_commit(struct commit *commit, filepair_fn fn,
+			     const char *prefix);
+
+// Accept only the date formats cgit documents, leaving mode unchanged for
+// anything else.
+extern void cgit_parse_date_format(const char *format, struct date_mode *mode);
+
+// Copy str without its trailing runs of c, returning NULL if nothing is left.
+extern char *cgit_trim_end(const char *str, char c);
+extern char *cgit_ensure_end(const char *str, char c);
+extern void strbuf_ensure_end(struct strbuf *sb, char c);
+
+/*
+ * Read the first line of a file into a newly allocated, zero terminated
+ * buffer. Returns 0 on success and an errno value otherwise.
+ */
+extern int cgit_read_first_line(const char *path, char **buf, size_t *size);
+extern char *cgit_strdup_first_line(const char *text);
+
+/*
+ * Replace every $token in text with the matching environment variable. The
+ * result is a static buffer, so a caller that needs to keep it must copy it.
+ */
+extern char *cgit_expand_macros(const char *text);
+
+extern char *cgit_get_mimetype_for_filename(const char *filename);
+
+#endif // CGIT_SHARED_H