We have our COBOL-Sources now in GIT-repositories. During development nearly all devs are removing the cobol leading line squence numbers. So the git diff is showing all lines as changed.
I want that a diff of these files would show just the ====> CHANGED line:
000201 PROCEDURE DIVISION USING VKT1511
000202 VKT1519
000203 LI-DUMMY
000204 LI-DUMMY
000205 LI-KKONTO
000206 BS0397-SEGMENT
000207 TAB-KONTEN
000208 TAB-LIMITE
000209 TAB-KUNDE
000210 BS0798.
000211*
000212* == VORLAUF ==
000213*
PROCEDURE DIVISION USING VKT1511
VKT1519
LI-DUMMY
LI-DUMMY
LI-KKONTO
BS0397-SEGMENT
TAB-KONTEN
TAB-LIMITE
TAB-KUNDE
===========> CHANGED.
*
* == VORLAUF ==
*
I don't care if I have to use standard GIT DIFF or TortoiseDiff or whatever.
You can define a diff driver -- doc in git help gitattributes -- to run a specific program for your cobol files.
A quick way to view a diff after stripping the 7 first columns:
diff <(cut -c8- "$file1") <(cut -c8- "$file2")
# you can actually use 'git diff' as a command line diff viewer:
git diff --no-index <(cut -c8- "$file1") <(cut -c8- "$file2")
You can stick that command in a script, and use that script as a diff driver:
# ~/bin/cobol-diff:
#!/bin/bash
old_file=$2
new_file=$5
git diff --no-index <(cut -c8- "$old_file") <(cut -c8- "$new_file")
# .git/config or global .gitconfig:
[diff "cobol-diff"]
command = path/to/cobol-diff
# .gitattributes:
.cobol diff=cobol-diff
Obviously: you may adapt the script or use any other suitable diff viewer (including a graphical one)