From fda6ad05f6b6ab4644e95d19a3f298a525cc2f3d Mon Sep 17 00:00:00 2001
From: Carl Cravens <ccravens@linode.com>
Date: Fri, 29 Jun 2018 14:29:47 -0400
Subject: [PATCH] add variable substitution to snippets

---
 README.md    |  8 ++++++++
 texpander.sh | 21 +++++++++++++++++++--
 2 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 2ff0a6d..09e7a2b 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,14 @@ The text expansion files reside in your `~/.texpander` directory and can be orga
 
 I have `crtl+space` assigned to run `~/bin/texpander.sh`. So, if I'm typing an email, it doesn't matter if I'm in gmail (using Firefox, Chrome, Opera, or Vivaldi), Thunderbird, Vim, or Nylas, the workflow is the same. I have a couple different email signatures that I use. If I am writing to somebody about Cart66, the [WordPress Shopping Cart plugin](https://cart66.com), I'll use my Cart66 signature. I have a file `~/.texpander/sig66.txt` that has all my contact info and so forth for Cart66.  
 
+You can perform variable substitution on expansion files, with optional default values.  Repeated variables will only prompt once, but if you use a default, be sure it is on the first occurrence or it will be dropped.  (The format is the same as TextExpander, so you can more easily import your Mac-using coworkers snippets.)
+
+```
+mkdir %filltext:name=DIRECTORY:default=root_tmpdir%
+chmod 755 %filltext:name=DIRECTORY%
+chown root. %filltext:name=DIRECTORY%
+```
+
 ![Texpander - text snippets for Ubuntu](https://lee.blue/share/texpander-demo.gif)
 
 ### Setting Up Custom Keyboard Shortcuts
diff --git a/texpander.sh b/texpander.sh
index bdb98bc..4d80b77 100755
--- a/texpander.sh
+++ b/texpander.sh
@@ -31,15 +31,32 @@ if [ -f "${base_dir}/${name}" ]
 then
   if [ -e "$path" ]
   then
+    # Determine if the text requires variable substitution
+    if grep '%filltext' $path
+    then
+      # variable pattern is either
+      # "%filltext:name=VAR%"
+      # "%filltext:name=VAR:default=DEFAULT%"
+      subpat=''
+      while read var def; do
+        val=$(zenity --entry --title=Texpander --text="$var" --entry-text="$def")
+        # build a sed pattern to replace the filltext
+        subpat+="s/%filltext:name=$var\(:default=[^%]\+\)\?%/$val/;"
+      done < <(grep -E -o '%filltext:name=[[:alnum:]]+(:default=[[:alnum:][:space:]]+)?%' $path |sed 's/%//g; s/\(name=\|default=\|filltext:\)//g; y/:/ /;' |sort -u -k1,1)
+      # grep returns just the matched text
+      # sed cleans up and returns lines of "name default text"
+      # sort removes duplicate names
+    fi
+
     # Preserve the current value of the clipboard
     clipboard=$(xsel -b -o)
 
     # Put text in primary buffer for Shift+Insert pasting
-    echo -n "$(tac "$path")" | tac | xsel -p -i 
+    echo -n "$(cat "$path")" | sed "$subpat" | xsel -p -i
 
     # Put text in clipboard selection for apps like Firefox that 
     # insist on using the clipboard for all pasting
-    echo -n "$(tac "$path")" | tac | xsel -b -i
+    echo -n "$(cat "$path")" | sed "$subpat" | xsel -b -i
 
     # Paste text into current active window
     sleep 0.3