tools/helpers.bash: Add git-shorlog-add/fix/update

These helper functions will optionally take a git ref argument, and
display the --format=oneline log from the git ref specifed to HEAD
XOR all of git history as appropriate.

The intent is for these helpers to make it easier to write stream update
notes.

Signed-off-by: Rune Morling <ermo@aerynos.com>

Author: ermo

tools/helpers.bash

@@ -127,6 +127,42 @@ function fixup-recipe-commit() {
     git log -1 -- .
 }
 
+git-shortlog-updates () {
+    local _arg="${1}"
+    local _oneline="--format=oneline"
+    if [[ -n ${_arg} ]]; then
+        _oneline="--format=oneline ${_arg}..HEAD"
+    fi
+    git log ${_oneline} \
+        |grep -E ': [Uu]pdate' \
+        |cut -f1 -d' ' --complement \
+        |sed -E -e 's|: [Uu]pdate to v?| |g'
+}
+
+git-shortlog-add () {
+    local _arg="${1}"
+    local _oneline="--format=oneline"
+    if [[ -n ${_arg} ]]; then
+        _oneline="--format=oneline ${_arg}..HEAD"
+    fi
+    git log ${_oneline} \
+        |grep -E ': [Aa]dd' \
+        |cut -f1 -d' ' --complement \
+        |sed -E -e 's|: [Aa]dd at v?| |g'
+}
+
+git-shortlog-fix () {
+    local _arg="${1}"
+    local _oneline="--format=oneline"
+    if [[ -n ${_arg} ]]; then
+        _oneline="--format=oneline ${_arg}..HEAD"
+    fi
+    git log ${_oneline} \
+        |grep -E ': [Ff]ix' \
+        |cut -f1 -d' ' --complement
+}
+
+
 # Bash completions
 _chpkg()
 {