split out to next.awk

bash/next.awk

@@ -0,0 +1,35 @@
+# awk script to increment the digits, preserve the zero prefix, add string descriptor if supplied, and add back extension
+
+BEGIN {
+# set field separator, blank by default
+FS = "."
+}
+
+{
+newnum = $1 + 1
+nzeros = length($1) - length(int(newnum))
+
+# could I do this with a simpler regex to select all leading zeros?
+leadingzeros = ""
+if (nzeros > 0)
+  for (i = 1; i <= nzeros; i++)
+    leadingzeros = sprintf("%s%s", leadingzeros, "0")
+
+if (nzeros > 0)
+  newnum = sprintf("%s%s", leadingzeros, newnum)
+
+# start by prefixing the number, now with leading zeros
+finalstr = newnum
+
+# allow an arg input to fill out descriptor string.
+if (arg != "")
+    finalstr = sprintf("%s.%s", finalstr, arg)
+
+# append last field by default
+finalstr = sprintf("%s.%s", finalstr, $NF)
+
+}
+
+END {
+print finalstr
+}

bash/next.sh

@@ -1,12 +1,12 @@
 # Get the file name in any numbered series of text files and open with emacs
 
 # Usage:
-#     $ . next [descriptor]
+#     $ next [descriptor]
 
 # Handles an optional string descriptor. Like this:
 #    $ ls
 #    011.blah.md
-#    $ . next foo
+#    $ next foo
 #    012.foo.md
 
 # File format:
@@ -15,100 +15,9 @@
 # in plain terms:
 #   [leadings numbers with consistent width].[optional string descriptor and . separator][md|txt]
 
-# what this does:
+# NOTE the optional $1 arg passed to awk with -v:
-# ls | grep [regex for number.*.md] | get last | awk script to increment the digits, preserve the zero prefix, add string descriptor if supplied, and add back extension
+NEXTFILE=`$UMBASEPATH/last.sh | awk -f $UMBASEPATH/next.awk -v arg=$1`
-
-# Note the egrep '^\d.*\.md|txt' (matches whole string) to account for an optional string between the initial number and the file extension. As in '435.blah.md'.
-
-# old version, relied on python, which didn't handle leading zeros properly, but treated them as binary:
-# ls | grep '\d.*\.md' | tail -n 1 | sed s/'\..*md'// | sed s/.*/'print & + 1'/ | python - | sed s/.*/'&.md/'
-
-# BUGS
-
-# 1. Emacs won't accept piped input as a file name. I'd rather keep this as a separate utility, which only printed the right filename, and then use an alias to pipe the filename to emacs, or invoke it manually.
-
-# A.
-# What I want, is this syntax:
-# next [optional arg]
-# To both get the file and open emacs with it.
-
-# B.
-# But this doesn't work:
-# next | emacs
-# Because it sees the stdin the pipe wants to feed it as a substitute for the tty in the new session, rather than as input for startup only, i.e. the filename.
-
-# C.
-# Wrapping the whole shell command here works, like this:
-# emacs `ls | grep ...`
-
-# But emacs doesn't like being run inside a child level shell, because it can't load .emacs properly. So you must run this file within the current shell using ".", like this:
-# . next
-# . next foo
-
-# D.
-# This does not work, because .profile must be executed, meaning that the "" expression is peeked by the shell:
-# alias next="emacs `next.sh $1`"
-
-# E.
-# This does not work either, because the arg never gets filled out when evoked:
-# alias next='emacs `next.sh $1`'
-
-# F.
-# This works and is the current solution:
-# alias next='. next.sh'
-
-# Which relies on 2 somewhat obscured facts:
-# 1. This script calls emacs itself, wrapping the real work in ``
-# 2. The alias is a simple substitution, which fortunately seems to happen before args are processed by the shell, meaning that the shell sees: ". next.sh arg"
-# 3. NOTE: the symbolic link in the PATH should not be simply "next", because it
-# may in certain situations conflict with the alias. The link should be "next.sh" -> ~/config/..
-# 4. NOTE: I use 'e' rather than 'emacs', to use my clever emacs/emacsclient function.
-
-
-NEXTFILE=`$UMBASEPATH/last.sh | awk '
-
-BEGIN {
-# set field separator, blank by default
-FS = "."
-}
-
-{
-newnum = $1 + 1
-nzeros = length($1) - length(int(newnum))
-
-# could I do this with a simpler regex to select all leading zeros?
-leadingzeros = ""
-if (nzeros > 0)
-  for (i = 1; i <= nzeros; i++)
-    leadingzeros = sprintf("%s%s", leadingzeros, "0")
-
-if (nzeros > 0)
-  newnum = sprintf("%s%s", leadingzeros, newnum)
-
-# start by prefixing the number, now with leading zeros
-finalstr = newnum
-
-# allow an arg input to fill out descriptor string.
-# single quote break to allow the shell to fill it out, double quotes so awk will treat it as a string
-arg = "'$1'"
-
-if (arg != "")
-    finalstr = sprintf("%s.%s", finalstr, arg)
-
-# append last field by default
-finalstr = sprintf("%s.%s", finalstr, $NF)
-
-# previous loop to reassemble all fields. But I do not want the old middle string here
-# Keeping it here for reference.
-# for (i = 2; i <= NF; i++)
-#   finalstr = sprintf("%s.%s", finalstr, $i)
-# }
-
-}
-
-END {
-print finalstr
-}'
-`
 
+# HACK: emacs won't accept piped input as a file name, so we use --eval to open
+# the file via find-file.
 emacsclient --eval "(progn (find-file \"$NEXTFILE\") (uldb-journal-header) (message \"creating $NEXTFILE\"))"