Support multi-line macros

src/include/build.sh

     esac
 }
 
+__expand_line() {
+    #
+    # Expand macro from $MacroMap in single line $1
+    #
+    # If macro value has multiple lines, repeat original line with
+    # different substitution.
+    #
+    # E.g. if macro value is "foo\nbar" and macro name is __FOO__,
+    # line `see: "__FOO__"` will expand to two lines: `see: "foo"`
+    # and `see: "bar"`.
+    #
+    local line=$1   # line to process
+    local mname     # macro name
+    local mvline    # line of macro value
+    for mname in "${!MacroMap[@]}"; do
+        if ! test "${line//$mname}" == "$line"; then
+            while IFS= read -r mvline; do
+                echo "${line//$mname/$mvline}"
+            done <<<"${MacroMap[$mname]}"
+            return 0
+        fi
+    done
+    echo "$line"
+    return 1
+}
+
 __expand_macros() {
     #
     # Read stdin, expanding macros from sections $@
     #
-    local script        # sed script cache
     local section       # each section to expand macros from
-    local varname       # each macro name
-    local varvalue      # each macro value
-    script=$(mktemp --tmpdir mkit-tmp.XXXXXXXXXX)
-    {
-        for section in "$@"; do
-            debug_var section
-            ini lskeys "$section" \
-              | while read -r varname; do
-                    varvalue="$(ini 1value "$section:$varname" | __qfs )"
-                    echo "s|$varname|$varvalue|g;"
-                    debug_var varname varvalue
-                done
+    local line          # each line on stdin
+    local mname         # each macro name
+    local -A MacroMap   # macro value map
+    MacroMap[__MKIT_PROJ_NAME__]=$(ini 1value project:name)
+    MacroMap[__MKIT_PROJ_CODENAME__]=$(ini 1value project:codename)
+    MacroMap[__MKIT_PROJ_LICENSE__]=$(ini 1value project:license)
+    MacroMap[__MKIT_PROJ_PKGNAME__]=$(ini 1value project:pkgname)
+    MacroMap[__MKIT_PROJ_TAGLINE__]=$(ini 1value project:tagline)
+    MacroMap[__MKIT_PROJ_MAINTAINER__]=$(ini 1value project:maintainer)
+    MacroMap[__MKIT_PROJ_VCS_BROWSER__]=$(ini 1value project:vcs_browser)
+    MacroMap[__MKIT_PROJ_GIT_LASTHASH__]=$(__cached git_lasthash)
+    MacroMap[__MKIT_PROJ_VERSION__]=$(__cached semver)
+    MacroMap[__MKIT_SELF_VERSION__]=$MKIT_VERSION
+    for section in "$@"; do
+        for mname in $(ini lskeys "$section"); do
+            MacroMap[$mname]=$(ini values "$section:$mname")
         done
-        echo "s|__MKIT_PROJ_NAME__|$(ini 1value project:name | __qfs)|g;"
-        echo "s|__MKIT_PROJ_CODENAME__|$(ini 1value project:codename | __qfs)|g;"
-        echo "s|__MKIT_PROJ_LICENSE__|$(ini 1value project:license | __qfs)|g;"
-        echo "s|__MKIT_PROJ_PKGNAME__|$(ini 1value project:pkgname | __qfs)|g;"
-        echo "s|__MKIT_PROJ_TAGLINE__|$(ini 1value project:tagline | __qfs)|g;"
-        echo "s|__MKIT_PROJ_MAINTAINER__|$(ini 1value project:maintainer | __qfs)|g;"
-        echo "s|__MKIT_PROJ_VCS_BROWSER__|$(ini 1value project:vcs_browser | __qfs)|g;"
-        echo "s|__MKIT_PROJ_GIT_LASTHASH__|$(__cached git_lasthash | __qfs)|g;"
-        echo "s|__MKIT_PROJ_VERSION__|$(__cached semver | __qfs)|g;"
-        echo "s|__MKIT_SELF_VERSION__|$MKIT_VERSION|g;"
-    } >> "$script"
-    sed -f "$script" || die "__expand_macros failed"
-    rm "$script"
+    done
+    debug_var MacroMap
+    while IFS= read -r line; do
+        __expand_line "$line"
+    done
 }
 
 __guess_ftype() {