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Munge special characters in env variables #8

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Munge special characters in env variables #8

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24 changes: 23 additions & 1 deletion src/omniconf/core.clj
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Original file line number Diff line number Diff line change
Expand Up @@ -153,6 +153,28 @@
(walk (conj prefix kw-name) nested))))]
(walk [] @config-scheme)))

(def env-char-replacements
"Valid characters in a keyword and their replacements in environment variables.
Check out https://clojure.org/reference/reader for a list of allowed characters."
{\/ "__SLASH__"
\. "__DOT__"
\* "__STAR__"
\+ "__PLUS__"
\! "__EXCL__"
\- "__"
\_ "__BAR__"
\' "__TICK__"
\? "__Q__"})

(defn munge-env-fragment
"Takes a keyword and replaces all special characters to make it a valid
environment variable fragment."
[fragment]
(->> (name fragment)
(map (fn [c] (get env-char-replacements c c)))
(apply str)
(.toUpperCase)))

(defn define
"Declare the configuration that the program supports. `scheme` is a map of
keyword names to specs.
Expand Down Expand Up @@ -189,7 +211,7 @@
(assoc :name kw-name)
(update-in [:env-name]
#(->> (conj prefix (or % kw-name))
(map (fn [x] (.replace (.toUpperCase (name x)) "-" "_")))
(map munge-env-fragment)
(str/join "__")))
(update-in [:opt-name]
#(->> (conj prefix (or % kw-name))
Expand Down