cssmin

commit 11d8bd16bd92a764f298c77d306f25d6da0981fc
parent c8ecb8284161673a00021e518c2aef2e8211e7ca
Author: Hugo Soucy <hugo@soucy.cc>
Date:   Mon,  6 Dec 2021 20:53:24 -0500

Add the possibility to input CSS by stdin

Diffstat:
M
cssmin
 | 
31
++++++++++++++++++++++++-------

1 file changed, 24 insertions(+), 7 deletions(-)
diff --git a/cssmin b/cssmin
@@ -1,12 +1,26 @@
 #!/usr/bin/env lua
 --- Removes line breaks, comments and spaces around symbols in a CSS file.
 --- No dependency, you only need lua (>= 5.1).
+--- With CSS file as argument or CSS block by stdin
 -- @name cssmin
 -- @param filepath the location of a CSS file
 -- @return A 'text/css' block
--- @usage ./cssmin styles.css[ > styles.min.css]
+-- Examples of uses
+--[[
+  $ ./cssmin styles.css > styles.min.css
+  $ ./cssmin < styles.css > styles.min.css
+  $ cat styles.css | ./cssmin
+  $ echo ".red { color: red; } | cssmin"
+]]
 
 do
+  local function minify(css)
+    return css
+      :gsub('\n', '') -- removes line-breaks
+      :gsub('%s*([:;,*>{}~])%s+', '%1') -- removes spaces around :;,*>{}~
+      :gsub('/%*.-%*/', '') -- removes comments
+  end
+
   if arg[1] and io.open(arg[1], 'r') then
     local file = arg[1]
     local extension = file:match("^.+(%..+)$")
@@ -24,15 +38,18 @@ do
     end
 
     if extension == '.css' then
-      local cssmin = read(file)
-        :gsub('\n', '') -- removes line-breaks
-        :gsub('%s*([:;,*>{}~])%s+', '%1') -- removes spaces around :;,*>{}~
-        :gsub('/%*.-%*/', '') -- removes comments
-
-      return print(cssmin)
+      return print(minify(read(file)))
     else
       print "[Error!] Wrong file type. It should be a 'text/css'."
     end
+  elseif not arg[1] and io.input() ~= nil then
+    local css = {}
+
+    for line in (io.lines()) do
+      css[#css+1] = line
+    end
+
+    return print(minify(table.concat(css)))
   elseif not arg[1] then
     print "An argument is missing. You sould add a CSS file as argument."
   else