format: create docs for pretty.h

Write some docs for functions in pretty.h.
Take it as a first draft, they would be changed later.

Signed-off-by: Olga Telezhnaia <[email protected]>
Mentored-by: Christian Couder <[email protected]>
Mentored by: Jeff King <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: telezhnaya

pretty.h

@@ -48,6 +48,7 @@ struct pretty_print_context {
 	int graph_width;
 };
 
+/* Check whether commit format is mail. */
 static inline int cmit_fmt_is_mail(enum cmit_fmt fmt)
 {
 	return (fmt == CMIT_FMT_EMAIL || fmt == CMIT_FMT_MBOXRD);
@@ -57,31 +58,74 @@ struct userformat_want {
 	unsigned notes:1;
 };
 
+/* Set the flag "w->notes" if there is placeholder %N in "fmt". */
 void userformat_find_requirements(const char *fmt, struct userformat_want *w);
+
+/*
+ * Shortcut for invoking pretty_print_commit if we do not have any context.
+ * Context would be set empty except "fmt".
+ */
 void pp_commit_easy(enum cmit_fmt fmt, const struct commit *commit,
 			struct strbuf *sb);
+
+/*
+ * Get information about user and date from "line", format it and
+ * put it into "sb".
+ * Format of "line" must be readable for split_ident_line function.
+ * The resulting format is "what: name <email> date".
+ */
 void pp_user_info(struct pretty_print_context *pp, const char *what,
 			struct strbuf *sb, const char *line,
 			const char *encoding);
+
+/*
+ * Format title line of commit message taken from "msg_p" and
+ * put it into "sb".
+ * First line of "msg_p" is also affected.
+ */
 void pp_title_line(struct pretty_print_context *pp, const char **msg_p,
 			struct strbuf *sb, const char *encoding,
 			int need_8bit_cte);
+
+/*
+ * Get current state of commit message from "msg_p" and continue formatting
+ * by adding indentation and '>' signs. Put result into "sb".
+ */
 void pp_remainder(struct pretty_print_context *pp, const char **msg_p,
 			struct strbuf *sb, int indent);
 
+/*
+ * Create a text message about commit using given "format" and "context".
+ * Put the result to "sb".
+ * Please use this function for custom formats.
+ */
 void format_commit_message(const struct commit *commit,
 			const char *format, struct strbuf *sb,
 			const struct pretty_print_context *context);
 
+/*
+ * Parse given arguments from "arg", check it for correctness and
+ * fill struct rev_info.
+ */
 void get_commit_format(const char *arg, struct rev_info *);
 
+/*
+ * Make a commit message with all rules from given "pp"
+ * and put it into "sb".
+ * Please use this function if you have a context (candidate for "pp").
+ */
 void pretty_print_commit(struct pretty_print_context *pp,
 			const struct commit *commit,
 			struct strbuf *sb);
 
+/*
+ * Change line breaks in "msg" to "line_separator" and put it into "sb".
+ * Return "msg" itself.
+ */
 const char *format_subject(struct strbuf *sb, const char *msg,
 			const char *line_separator);
 
+/* Check if "cmit_fmt" will produce an empty output. */
 int commit_format_is_empty(enum cmit_fmt);
 
 #endif /* PRETTY_H */