Basic css minifier for the built-in stylesheet

Runs on `pegs.multireplace` and is very basic: deals only with
whitespace and comments. Doesn't know anything about quoted
strings in CSS.

Author: ZoomRmc

README.md

@@ -25,6 +25,7 @@ Where:
   - **--noembed** causes styles and images not to be embedded.
   - **--fragment** causes HastyScribe to output just an HTML fragment instead of a full document, without embedding any image, font or stylesheet.
   - **--iso** enables HastyScribe to use the ISO 8601 date format (e.g., 2000-12-31) in the footer of the generated HTML documents.
+  - **--minify-css** uses an unsophisticated minifier on the built-in stylesheet before embedding it into HTML. Ignored when combined with `--noembed`.
   - **--no-clobber** or **-n** prevents HastyScribe from overwriting existing files. If a file with the same name already exists, HastyScribe will issue a warning and will not overwrite it.
   - **--help** causes HastyScribe to display the usage information and quit.
 

doc/-usage.md

@@ -19,6 +19,7 @@ Where:
     * [\-\-notoc](class:opt) causes {{hs}} to output HTML documents _without_ automatically generating a Table of Contents at the start.
     * [\-\-noembed](class:opt) causes styles and images not to be embedded.
     * [\-\-fragment](class:opt) causes {{hs}} to output just an HTML fragment instead of a full document, without embedding any image, font or stylesheet.
+    * [\-\-minify-css](class:opt) uses an unsophisticated minifier on the built-in stylesheet before embedding it into HTML. Ignored when combined with [\-\-noembed](class:opt).
     * [\-\-iso](class:opt) enables {{hs}} to use the ISO 8601 date format (e.g., 2000-12-31) in the footer of the generated HTML documents.
     * [\-\-no-clobber](class:opt) or [\-n](class:opt) prevents {{hs}} from overwriting existing files. If a file with the same name already exists, {{hs}} will issue a warning and will not overwrite it.
     * [\-\-help](class:opt) causes {{hs}} to display the usage information and quit.

src/hastyscribe.nim

@@ -44,6 +44,7 @@ type
     fragment*: bool = false
     embed*: bool = true
     iso*: bool = false
+    minifycss*: bool = false
     noclobber*: bool = false
     outputToDir*: bool = false
     processingMultiple: bool = false
@@ -59,6 +60,7 @@ type
     snippets: HastySnippets
     macros: HastyMacros
     document: string
+    hastyStylesheet: string
     iconStyles: HastyIconStyles
     noteStyles: HastyNoteStyles
     badgeStyles: HastyBadgeStyles
@@ -94,7 +96,18 @@ proc initFields(fields: HastyFields): HastyFields {.gcsafe.} =
   result["timezone-offset"] = now.format("zzz")
 
 proc newHastyScribe*(options: HastyOptions, fields: HastyFields): HastyScribe =
-  return HastyScribe(options: options, fields: initFields(fields), snippets: initTable[string, string](), macros: initTable[string, string](), document: "")
+  HastyScribe(
+    options: options,
+    fields: initFields(fields),
+    snippets: initTable[string, string](),
+    macros: initTable[string, string](),
+    document: "",
+    hastyStylesheet: (
+      if not options.embed: ""
+      elif options.minifycss: stylesheet.minifyCss()
+      else: stylesheet
+    ),
+  )
 
 # Utility Procedures
 
@@ -427,7 +440,7 @@ proc compileDocument*(hs: var HastyScribe, input, dir: string): string {.discard
       "<div id=\"header\"><h1>" & metadata.title & "</h1></div>"
 
     (main_css_tag, optional_css_tag) = if hs.options.embed:
-        (stylesheet.style_tag, hs.create_optional_css(hs.document))
+        (hs.hastyStylesheet.style_tag, hs.create_optional_css(hs.document))
       else:
         ("", "")
 
@@ -575,6 +588,7 @@ when isMainModule:
     --fragment              If specified, an HTML fragment will be generated, without
                             embedding images or stylesheets.
     --iso                   Use ISO 8601 date format (e.g., 2000-12-31) in the footer.
+    --minify-css,           Minify the built-in stylesheet before embedding.
     --no-clobber, -n        Do not overwrite existing files.
     --help,       -h        Display the usage information.
     --version,    -v        Print version and exit."""
@@ -623,6 +637,9 @@ when isMainModule:
       of "iso":
         noVal()
         options.iso = true
+      of "minify-css":
+        noVal()
+        options.minifycss = true
       of "n", "no-clobber", "noclobber":
         noVal()
         options.noclobber = true

src/hastyscribepkg/utils.nim

@@ -63,3 +63,12 @@ proc makeFNameUnique*(baseName, dir: string): string =
       uniquePrefix = encode(hashBytes, safe=true)
     baseName & '_' & uniquePrefix
   else: baseName
+
+proc minifyCss*(css: string): string =
+  css.parallelReplace([
+    (peg" '/*' @ '*/'", ""),
+    (peg" {\w} \s* {[ \>\< ]} \s* {\w / '*'} ", "$1$2$3" ),
+    (peg" \s* { [ \,\{\}\[\]\:\; ] } \s* ", "$1"),
+    (peg" \s+ ", " "),
+    (peg""" ')' \s* \" """, ")\"" ),
+  ])