strbufs has some invariants that are very important to keep in mind:
-. The `buf` member is never NULL, so you it can be used in any usual C
+. The `buf` member is never NULL, so it can be used in any usual C
string operations safely. strbuf's _have_ to be initialized either by
`strbuf_init()` or by `= STRBUF_INIT` before the invariants, though.
+
* `struct strbuf`
-This is string buffer structure. The `len` member can be used to
+This is the string buffer structure. The `len` member can be used to
determine the current length of the string, and `buf` member provides access to
the string itself.
the length of the placeholder recognized and `strbuf_expand()` skips
over it.
+
+The format `%%` is automatically expanded to a single `%` as a quoting
+mechanism; callers do not need to handle the `%` placeholder themselves,
+and the callback function will not be invoked for this placeholder.
++
All other characters (non-percent and not skipped ones) are copied
verbatim to the strbuf. If the callback returned zero, meaning that the
placeholder is unknown, then the percent sign is copied, too.
placeholder and replacement string. The array needs to be
terminated by an entry with placeholder set to NULL.
+`strbuf_addbuf_percentquote`::
+
+ Append the contents of one strbuf to another, quoting any
+ percent signs ("%") into double-percents ("%%") in the
+ destination. This is useful for literal data to be fed to either
+ strbuf_expand or to the *printf family of functions.
+
`strbuf_addf`::
Add a formatted string to the buffer.
comments are considered contents to be removed or not.
`launch_editor`::
+
+ Launch the user preferred editor to edit a file and fill the buffer
+ with the file's contents upon the user completing their editing. The
+ third argument can be used to set the environment which the editor is
+ run in. If the buffer is NULL the editor is launched as usual but the
+ file's contents are not read into the buffer upon completion.