build: add build option to minify *.js files

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

5 files changed, 311 insertions, 2 deletions

diff --git a/.gitignore b/.gitignore
index 07494e98ef..2e4ba9b81a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,4 @@ dist/
 *.po~
 /docs
 modules/luci-base/src/po2lmo
+modules/luci-base/src/jsmin
diff --git a/luci.mk b/luci.mk
index f9153819ee..aa2e195e27 100644
--- a/luci.mk
+++ b/luci.mk
@@ -84,7 +84,7 @@ PKG_GITBRANCH?=$(if $(DUMP),x,$(strip $(shell \
 PKG_RELEASE?=1
 PKG_INSTALL:=$(if $(realpath src/Makefile),1)
 PKG_BUILD_DEPENDS += lua/host luci-base/host $(LUCI_BUILD_DEPENDS)
-PKG_CONFIG_DEPENDS += CONFIG_LUCI_SRCDIET
+PKG_CONFIG_DEPENDS += CONFIG_LUCI_SRCDIET CONFIG_LUCI_JSMIN
 
 PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)
 
@@ -113,6 +113,10 @@ ifeq ($(PKG_NAME),luci-base)
 	bool "Minify Lua sources"
 	default n
 
+   config LUCI_JSMIN
+	bool "Minify JavaScript sources"
+	default y
+
    menu "Translations"$(foreach lang,$(LUCI_LANGUAGES),
 
      config LUCI_LANG_$(lang)
@@ -158,6 +162,13 @@ define SrcDiet
 	done
 endef
 
+define JsMin
+	$(FIND) $(1) -type f -name '*.js' | while read src; do \
+		if jsmin < "$$$$src" > "$$$$src.o"; \
+		then mv "$$$$src.o" "$$$$src"; fi; \
+	done
+endef
+
 define SubstituteVersion
 	$(FIND) $(1) -type f -name '*.htm' | while read src; do \
 		$(SED) 's/<%# *\([^ ]*\)PKG_VERSION *%>/\1$(PKG_VERSION)/g' \
@@ -177,6 +188,7 @@ define Package/$(PKG_NAME)/install
 	if [ -d $(PKG_BUILD_DIR)/htdocs ]; then \
 	  $(INSTALL_DIR) $(1)$(HTDOCS); \
 	  cp -pR $(PKG_BUILD_DIR)/htdocs/* $(1)$(HTDOCS)/; \
+	  $(if $(CONFIG_LUCI_JSMIN),$(call JsMin,$(1)$(HTDOCS)/),true); \
 	else true; fi
 	if [ -d $(PKG_BUILD_DIR)/root ]; then \
 	  $(INSTALL_DIR) $(1)/; \
diff --git a/modules/luci-base/Makefile b/modules/luci-base/Makefile
index 06ee7985eb..9bc8ec17a1 100644
--- a/modules/luci-base/Makefile
+++ b/modules/luci-base/Makefile
@@ -36,13 +36,14 @@ define Host/Configure
 endef
 
 define Host/Compile
-	$(MAKE) -C src/ clean po2lmo
+	$(MAKE) -C src/ clean po2lmo jsmin
 endef
 
 define Host/Install
 	$(INSTALL_DIR) $(1)/bin
 	$(INSTALL_DIR) $(1)/lib/lua/5.1
 	$(INSTALL_BIN) src/po2lmo $(1)/bin/po2lmo
+	$(INSTALL_BIN) src/jsmin $(1)/bin/jsmin
 	$(INSTALL_BIN) $(HOST_BUILD_DIR)/bin/luasrcdiet $(1)/bin/luasrcdiet
 	$(CP) $(HOST_BUILD_DIR)/luasrcdiet $(1)/lib/lua/5.1/
 endef
diff --git a/modules/luci-base/src/Makefile b/modules/luci-base/src/Makefile
index 03e887e1d5..3e6ead1085 100644
--- a/modules/luci-base/src/Makefile
+++ b/modules/luci-base/src/Makefile
@@ -4,6 +4,9 @@
 clean:
 	rm -f po2lmo parser.so version.lua *.o
 
+jsmin: jsmin.o
+	$(CC) $(LDFLAGS) -o $@ $^
+
 po2lmo: po2lmo.o template_lmo.o
 	$(CC) $(LDFLAGS) -o $@ $^
 
diff --git a/modules/luci-base/src/jsmin.c b/modules/luci-base/src/jsmin.c
new file mode 100644
index 0000000000..d23718df39
--- /dev/null
+++ b/modules/luci-base/src/jsmin.c
@@ -0,0 +1,292 @@
+/* jsmin.c
+   2011-09-30
+
+Copyright (c) 2002 Douglas Crockford  (www.crockford.com)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+The Software shall be used for Good, not Evil.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include <stdlib.h>
+#include <stdio.h>
+
+static int   theA;
+static int   theB;
+static int   theLookahead = EOF;
+
+
+/* isAlphanum -- return true if the character is a letter, digit, underscore,
+        dollar sign, or non-ASCII character.
+*/
+
+static int
+isAlphanum(int c)
+{
+    return ((c >= 'a' && c <= 'z') || (c >= '0' && c <= '9') ||
+        (c >= 'A' && c <= 'Z') || c == '_' || c == '$' || c == '\\' ||
+        c > 126);
+}
+
+
+/* get -- return the next character from stdin. Watch out for lookahead. If
+        the character is a control character, translate it to a space or
+        linefeed.
+*/
+
+static int
+get()
+{
+    int c = theLookahead;
+    theLookahead = EOF;
+    if (c == EOF) {
+        c = getc(stdin);
+    }
+    if (c >= ' ' || c == '\n' || c == EOF) {
+        return c;
+    }
+    if (c == '\r') {
+        return '\n';
+    }
+    return ' ';
+}
+
+
+/* peek -- get the next character without getting it.
+*/
+
+static int
+peek()
+{
+    theLookahead = get();
+    return theLookahead;
+}
+
+
+/* next -- get the next character, excluding comments. peek() is used to see
+        if a '/' is followed by a '/' or '*'.
+*/
+
+static int
+next()
+{
+    int c = get();
+    if  (c == '/') {
+        switch (peek()) {
+        case '/':
+            for (;;) {
+                c = get();
+                if (c <= '\n') {
+                    return c;
+                }
+            }
+        case '*':
+            get();
+            for (;;) {
+                switch (get()) {
+                case '*':
+                    if (peek() == '/') {
+                        get();
+                        return ' ';
+                    }
+                    break;
+                case EOF:
+                    fprintf(stderr, "Error: JSMIN Unterminated comment.\n");
+                    exit(1);
+                }
+            }
+        default:
+            return c;
+        }
+    }
+    return c;
+}
+
+
+/* action -- do something! What you do is determined by the argument:
+        1   Output A. Copy B to A. Get the next B.
+        2   Copy B to A. Get the next B. (Delete A).
+        3   Get the next B. (Delete B).
+   action treats a string as a single character. Wow!
+   action recognizes a regular expression if it is preceded by ( or , or =.
+*/
+
+static void
+action(int d)
+{
+    switch (d) {
+    case 1:
+        putc(theA, stdout);
+    case 2:
+        theA = theB;
+        if (theA == '\'' || theA == '"' || theA == '`') {
+            for (;;) {
+                putc(theA, stdout);
+                theA = get();
+                if (theA == theB) {
+                    break;
+                }
+                if (theA == '\\') {
+                    putc(theA, stdout);
+                    theA = get();
+                }
+                if (theA == EOF) {
+                    fprintf(stderr, "Error: JSMIN unterminated string literal.");
+                    exit(1);
+                }
+            }
+        }
+    case 3:
+        theB = next();
+        if (theB == '/' && (theA == '(' || theA == ',' || theA == '=' ||
+                            theA == ':' || theA == '[' || theA == '!' ||
+                            theA == '&' || theA == '|' || theA == '?' ||
+                            theA == '{' || theA == '}' || theA == ';' ||
+                            theA == '\n')) {
+            putc(theA, stdout);
+            putc(theB, stdout);
+            for (;;) {
+                theA = get();
+                if (theA == '[') {
+                    for (;;) {
+                        putc(theA, stdout);
+                        theA = get();
+                        if (theA == ']') {
+                            break;
+                        }
+                        if (theA == '\\') {
+                            putc(theA, stdout);
+                            theA = get();
+                        }
+                        if (theA == EOF) {
+                            fprintf(stderr,
+                                "Error: JSMIN unterminated set in Regular Expression literal.\n");
+                            exit(1);
+                        }
+                    }
+                } else if (theA == '/') {
+                    break;
+                } else if (theA =='\\') {
+                    putc(theA, stdout);
+                    theA = get();
+                }
+                if (theA == EOF) {
+                    fprintf(stderr,
+                        "Error: JSMIN unterminated Regular Expression literal.\n");
+                    exit(1);
+                }
+                putc(theA, stdout);
+            }
+            theB = next();
+        }
+    }
+}
+
+
+/* jsmin -- Copy the input to the output, deleting the characters which are
+        insignificant to JavaScript. Comments will be removed. Tabs will be
+        replaced with spaces. Carriage returns will be replaced with linefeeds.
+        Most spaces and linefeeds will be removed.
+*/
+
+static void
+jsmin()
+{
+    theA = '\n';
+    action(3);
+    while (theA != EOF) {
+        switch (theA) {
+        case ' ':
+            if (isAlphanum(theB)) {
+                action(1);
+            } else {
+                action(2);
+            }
+            break;
+        case '\n':
+            switch (theB) {
+            case '{':
+            case '[':
+            case '(':
+            case '+':
+            case '-':
+                action(1);
+                break;
+            case ' ':
+                action(3);
+                break;
+            default:
+                if (isAlphanum(theB)) {
+                    action(1);
+                } else {
+                    action(2);
+                }
+            }
+            break;
+        default:
+            switch (theB) {
+            case ' ':
+                if (isAlphanum(theA)) {
+                    action(1);
+                    break;
+                }
+                action(3);
+                break;
+            case '\n':
+                switch (theA) {
+                case '}':
+                case ']':
+                case ')':
+                case '+':
+                case '-':
+                case '"':
+                case '\'':
+                case '`':
+                    action(1);
+                    break;
+                default:
+                    if (isAlphanum(theA)) {
+                        action(1);
+                    } else {
+                        action(3);
+                    }
+                }
+                break;
+            default:
+                action(1);
+                break;
+            }
+        }
+    }
+}
+
+
+/* main -- Output any command line arguments as comments
+        and then minify the input.
+*/
+extern int
+main(int argc, char* argv[])
+{
+    int i;
+    for (i = 1; i < argc; i += 1) {
+        fprintf(stdout, "// %s\n", argv[i]);
+    }
+    jsmin();
+    return 0;
+}