update composure.sh

automatically version shell functions with git:
 * treat all shell functions as micro shell scripts
 * store functions as .sh files in a ~/.composure repo
 * revise () edits functions from last commit state
 * re-source functions from ~/.composure at any time, in any shell

numerous fixes and refactorings

lib/composure.sh

@@ -33,41 +33,52 @@ source_composure ()
 
     draft ()
     {
-      about wraps last command into a new function
-      param 1: name to give function
-      example $ ls
-      example $ draft list
-      example $ list
-      local name=$1
-      eval 'function ' $name ' { ' $(fc -ln -1) '; }'
+        about wraps last command into a new function
+        param 1: name to give function
+        example $ ls
+        example $ draft list
+        example $ list
+        local func=$1
+        eval 'function ' $func ' { ' $(fc -ln -1) '; }'
+        local file=$(mktemp /tmp/draft.XXXX)
+        declare -f $func > $file
+        transcribe $func $file draft
+        rm $file 2>/dev/null
     }
 
-    write ()
+    transcribe ()
     {
-      about prints function declaration to stdout
-      param name of function or functions, separated by spaces
-      example $ write myfunction
-      example $ write func1 func2 func3 > ~/funcs.sh
-      local func
-      for func in $*
-      do
-          # trim trailing semicolons generated by declare -f
-          declare -f $func | sed  "s/^\(.*\);$/\1/"
-          echo
-      done
-    }
+        about store function in ~/.composure git repository
+        param 1: function name
+        param 2: file containing function
+        param 3: operation label
+        example $ transcribe myfunc /tmp/myfunc.sh 'scooby-doo version'
+        example stores your function changes with:
+        example master 7a7e524 scooby-doo version myfunc
+        local func=$1
+        local file=$2
+        local operation="$3"
 
-    revise ()
-    {
-        about loads function into editor for revision
-        param name of function or functions, separated by spaces
-        example $ revise myfunction
-        example $ revise func1 func2 func3
-        local temp=$(mktemp /tmp/revise.XXXX)
-        write $* > $temp
-        $EDITOR $temp
-        eval "$(cat $temp)"
-        rm $temp
+        if git --version >/dev/null 2>&1
+        then
+            if [ -d ~/.composure ]
+            then
+                (
+                    cd ~/.composure
+                    if git rev-parse 2>/dev/null
+                    then
+                        if [ ! -f $file ]
+                        then
+                            echo "Oops! Couldn't find $file to version it for you..."
+                            return
+                        fi
+                        cp $file ~/.composure/$func.sh
+                        git add --all .
+                        git commit -m "$operation $func"
+                    fi
+                )
+            fi
+        fi
     }
 
     metafor ()
@@ -77,7 +88,7 @@ source_composure ()
         param 2: meta keyword
         example $ metafor reference example
         local func=$1 keyword=$2
-        write $func | sed -n "s/^ *$keyword \([^([].*\)$/\1/p"
+        declare -f $func | sed -n "s/;$//;s/^ *$keyword \([^([].*\)*$/\1/p"
     }
 
     reference ()
@@ -89,7 +100,7 @@ source_composure ()
 
         printline ()
         {
-            local metadata=$1 lhs=${2:- }
+            local metadata=$1 leftcol=${2:- } rightcol
 
             if [[ -z "$metadata" ]]
             then
@@ -97,10 +108,9 @@ source_composure ()
             fi
 
             OLD=$IFS; IFS=$'\n'
-            local line
-            for line in $metadata
+            for rightcol in $metadata
             do
-                printf "%-20s%s\n" $lhs $line
+                printf "%-20s%s\n" $leftcol $rightcol
             done
             IFS=$OLD
         }
@@ -125,8 +135,6 @@ source_composure ()
                 echo "examples:"
                 printline "$examples"
             fi
-
-            unset printline
         }
 
         if [[ -n "$1" ]]
@@ -142,6 +150,30 @@ source_composure ()
         unset help printline
     }
 
+    revise ()
+    {
+        about loads function into editor for revision
+        param 1: name of function
+        example $ revise myfunction
+
+        local func=$1
+        local temp=$(mktemp /tmp/revise.XXXX)
+
+        # populate tempfile...
+        if [ -f ~/.composure/$func.sh ]; then
+            # ...with contents of latest git revision...
+            cat ~/.composure/$func.sh >> $temp
+        else
+            # ...or from ENV if not previously versioned
+            declare -f $func >> $temp
+        fi
+        $EDITOR $temp
+        source $temp
+
+        transcribe $func $temp revise
+        rm $temp
+    }
+
 }
 
 install_composure ()
@@ -178,6 +210,23 @@ install_composure ()
       echo "source $DIR/$(basename $0)" >> ~/.bashrc
     fi
 
+    # prepare git repo
+    if git --version >/dev/null 2>&1
+    then
+        if [ ! -d ~/.composure ]
+        then
+            (
+                echo 'creating git repository for your functions...'
+                mkdir ~/.composure
+                cd ~/.composure
+                git init
+                echo "composure stores your function definitions here" > README.txt
+                git add README.txt
+                git commit -m 'initial commit'
+            )
+        fi
+    fi
+
     echo 'composure installed.'
 }