From: Austin Clements Date: Sun, 16 Dec 2012 03:17:23 +0000 (-0500) Subject: cli: Framework for structured output versioning X-Git-Tag: 0.15_rc1~79 X-Git-Url: https://git.cworth.org/git?a=commitdiff_plain;h=1c6195b9e35e511e115f94b45d97aa58ee41b307;hp=1c6195b9e35e511e115f94b45d97aa58ee41b307;p=notmuch cli: Framework for structured output versioning Currently there is a period of pain whenever we make backward-incompatible changes to the structured output format, which discourages not only backward-incompatible improvements to the format, but also backwards-compatible additions that may not be "perfect". In the end, these problems limit experimentation and innovation. This series of patches introduces a way for CLI callers to request a specific format version on the command line and to determine if the CLI does not supported the requested version (and perhaps present a useful diagnostic to the user). Since the caller requests a format version, it's also possible for the CLI to support multiple incompatible versions simultaneously, unlike the alternate approach of including version information in the output. This patch lays the groundwork by introducing a versioning convention, standard exit codes, and a utility function to check the requested version and produce standardized diagnostic messages and exit statuses. ---