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POFormatting git log output with sed/awk/grep
 

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    <p><strong>Summary / 'gist of' version,</strong></p> <p>if I have a set of messages with subject <code>[SUB]</code> and body <code>[BODY]</code> like below, How can I add a newline after the subject <em>only if <code>[BODY]</code> exists</em> (And replace the place holders with <code>*</code>)</p> <pre><code>[SUB] some subject. [BODY] some body lines with newline chars and !@@# bunch of other *#@ chars without [(BODY)] or [(SUB)]... and more stuff [SUB] Another subject. with no body [BODY] [SUB] another [BODY] some body. </code></pre> <p>I want this to be formatted like</p> <pre><code>* some subject. some body lines with newline chars and !@@# bunch of other *#@ chars without [(BODY)] or [(SUB)]... and more stuff * Another subject. with no body * another some body. </code></pre> <hr> <p><strong>What I really wanna do,</strong></p> <p>So I am trying to auto-generate my CHANGELOG.md file from the <code>git log</code> output. The problem is, I need to put newline char only if the body of the commit message is non empty.</p> <p>The current code looks like this, (broken into two lines)</p> <pre><code>git log v0.1.0..v0.1.2 --no-merges --pretty=format:'* %s -- %cn | \ [%h](http://github.com/../../commit/%H) %n%b' | grep -v Minor | grep . &gt;&gt; CHANGELOG.md </code></pre> <p>and a sample output,</p> <pre><code>* Added run information display (0.1.2) -- ... | [f9b1f6c](http://github.com/../../commit/...) + Added runs page to show a list of all the runs and run inforation, include sorting and global filtering. + Updated run information display panel on the run-info page + Changed the links and their names around. * Update README.md -- abc | [2a90998](http://github.com/../../commit/...) * Update README.md -- xt | [00369bd](http://github.com/../../commit/...) </code></pre> <p>You see here, the lines starting with the <code>*</code> are the commits, and the lines starting on <code>+</code> are just a part of the body for the first commit. Right now it adds a <code>%n</code> (newline) in front of all the body sections regardless of whether it's empty or not. I want to add this ONLY if its non empty (probably even after removing the whitespaces)</p> <p>How would I achieve this? my knowledge of <code>sed</code> and <code>awk</code> is almost non-existing, and trying to learn didn't help much. </p> <p>(I will can make sure all the code in the body is indented, so it wont confuse list of commits with lists in the body)</p> <hr> <p><strong>My Answer</strong></p> <p>i'm sure jthills answer is correct (and maye even a better way to do it), but while I was looking to figure out what his meant, i came up wit this. Hope it will help myself or someone in he future,</p> <p>I am pasting the full shell script that I used,</p> <pre><code>mv CHANGELOG.md CHANGELOG.md.temp printf '### Version '$1' \n\n' &gt; CHANGELOG.md git log $2..$1 --no-merges --pretty=format:'[SUB]%s -- %cn | \ [%h](http://github.com/&lt;user&gt;/&lt;gitrepo&gt;/commit/%H) [BODY]%b' | grep -v Minor | \ sed '{:q;N;s/\s*\[BODY\][\n\s]*\[SUB\]/\n\[SUB\]/;b q}' | \ sed 's/\[SUB\]/* /g' | sed 's/\[BODY\]/\n\n/'&gt;&gt; CHANGELOG.md cat CHANGELOG.md.temp &gt;&gt; CHANGELOG.md rm CHANGELOG.md.temp </code></pre> <p>I am basically prepending the new commit log to the CHANGELOG.md using the temp file. Please feel free to suggest shorter versions for this 3 <code>sed</code> commands</p>
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    1. COSo you do not want to remove the empty line after the `+ Changed` line?
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    2. COThat can be removed. It wouldn't matter. But I need to add a newline in between `+`s and `*`, in this case
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    3. COI am not familiar with change logs, but from your output, you already have a newline between `+` and `*`..
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